Does __ne__ use an overridden __eq__?
From the docs: There are no implied relationships among the comparison operators. The truth of x==y does not imply that x!=y is false. Accordingly, when defining __eq__(), one should also define __ne__() so that the operators will behave as expected. ...
Comparing two excel Sheets using VBA
excel,vba,excel-vba,comparison
Yes there is - Microsoft Query (SQL in Excel). You can access it from Data->From Other Sources->Microsoft Query SQL is exceptional in comparing/consolidating/updating multiple data sources. See this section of my blog post here. Microsoft Query will also be much faster than any VBA macro. An example of your issue:...
String comparison in ksh never succeeding
== is not a valid comparison operator in POSIX test. If your particular implementation of ksh doesn't implement an extension adding it, you may need to use if [ "$VAR" = "NO" ] rather than if [ "$VAR" == "NO" ] I'd also consider using egrep -o 'SI|NO' to leave...
Write the condition - only one of three numbers are multiple of 5
Then I expect you want something like condition = x % 5 == 0 ? y % 5 != 0 && z % 5 != 0 : y % 5 == 0 ^ z % 5 == 0; Or condition = (x % 5 == 0 ? 1 : 0...
MIPS - is there a way to transfer the value of the flag in coprocessor 1 to integer registers of coprocessor 0?
assembly,floating-point,comparison,mips,spim
You could use MOVF (or MOVT) to put a value in a GPR based on a single FP condition code: MOVF rd, rs, cc To test an FP condition code then conditionally move a GPR If the floating point condition code specified by CC is zero, then the contents of...
Theoretically, is comparison between 0 and 255 faster than 0 and 1?
performance,comparison,bit,low-level,machine-code
Hardware is fundamentally different from the dominant programming paradigms in that all logic gates (or circuits in general) always do their work independently, in parallel, at all times. There is no such thing as "do this, then do that", only "do this here, feed the result into the circuit over...
Using the !== Operator to compare strings taken froma Dropdown list - Javascript
javascript,comparison,operators
Your use of !== is fine. The problem is with your use of || instead of &&. There's also a typo — you misspelled "q1check" in the second comparison. The test in the if statement: if(q1check !== "1" || q1check !=="0") (assuming you fix the typo like I did) will...
Comparing two decimals
I think if I don't use Round then this solution is fine. var valOne = 1.1234560M; // Decimal.Round(1.1234560M, 6); Don't round. var valTwo = 1.1234569M; // Decimal.Round(1.1234569M, 6); Don't round if (Math.Abs(valOne - valTwo) >= 0.000001M) // Six digits after decimal in epsilon { Console.WriteLine("Values differ"); } else { Console.WriteLine("Values...
Compare two arrays for a value
use the function array_intersect function in php. Eg: $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"green","g"=>"blue"); $result=array_intersect($a1,$a2) if (count($result)>=1) { //give access to the user } link: http://www.w3schools.com/php/func_array_intersect.asp...
Trouble in a program to convert between currencies in C++
When you enter 100e10e it works ok. 100e10 is a valid number in scientific notation. 100e is not a valid number in scientific notation. It is not converted to double and money is assigned 0. Variable currency stays unchanged. That is why you get "Sorry, currency not supported" message. e...
Compare two instances of an object in Swift
Indicate that your class conforms to the Equatable protocol, and then implement the == operator. Something like this: class PLClient: Equatable { var name = String() var id = String() var email = String() var mobile = String() var companyId = String() var companyName = String() //The rest of your...
Why Comparison Of two Integer using == sometimes works and sometimes not? [duplicate]
The Java Language Specification says that the wrapper objects for at least -128 to 127 are cached and reused by Integer.valueOf(), which is implicitly used by the autoboxing.
Python, comparison sublists and making a list
python,comparison,append,sublist
You will have to catch the duplicate indexes but this should be a lot more efficient: gr = [] it = iter(mylst) prev = next(it) for ind, ele in enumerate(it): if ele[0] == prev[0] and abs(ele[1] - prev[1]) <= 2: if any(abs(ele[i] - prev[i]) < 10 for i in (2,...
Using Linq to compare a list with a set of lists in C#
You can use Intersect + Any: query = query.Where(x => x.Tags.Intersect(tagList).Any()); This presumes that Tags actually is an IEnumerable<string>or another type that overrides Equals + GetHashCode. If that's not the case you can provide a custom IEqualityComparer<Tag> for Intersect. So tagList is the List<string> of the curent-page as requested. But...
Global class comparison with inheritance
c++,class,inheritance,comparison
Your design has the potential to produce unexpected results. If your main is: int main(int argc, char** argv) { Foo a(1); Bar d(1, 2); coutResult(a, d); return 0; } you'll end up comparing a Foo object with a Bar object and output will be: l.m_a == 1, r.m_a == 1,...
ACL “fuzzy” comparision
arrays,powershell,comparison,powershell-v2.0
I'd do something like this: $defaults = 'BUILTIN\Administrators', 'MYDOMAIN\DomainGroup', 'S-1-5-21*' $access | ? { $id = $_.IdentityReference -not ($defaults | ? { $_ -like $id }) } | select -Expand value $defaults | ? { $_ -like $id } does a wildcard match of the given identity against all items...
Comparison method violates its general contract when sorting
This is one example of the sort of change that I think is needed. As @CommuSoft pointed out in a comment, the current treatment of null for o1 and o2 breaks transitivity. I would replace: if (o2 == null || o1 == null) return 0; with: if (o2 == null...
Comparison != doesnt work like I expect
python,comparison,control,operator-keyword,flow
The expression you are evaluating always returns True salir != "s" or salir != "S" == True # always If the user inputs 's', then salir != "S" If the user inputs 'S', then salir != "s" If you want to split the two cases (instead of calling the lower()...
get buffer contents, store it in struct, get new buffer contents see if equal in struct
c++,c,arrays,struct,comparison
One problem: if (input == output) That just compares two pointers, not the contents of what they point to. Use: if (strcmp(input, output) == 0 ) PS There might be other problems in your code....
PHP Loose comparison and null on Switch
php,null,switch-statement,comparison,case
If $sHost equals to null or '', then the first switch case is always true because var_dump($sHost == (strpos($sHost, "dev.localhost") !== false)); is true. How switch work. You can do this: switch(true) { // Local case strpos($sHost, "dev.localhost") !== false: $this->_sEnv = 'local'; break; // Prod default: $this->_sEnv = 'production';...
Char Comparison in Common Lisp
sorting,char,comparison,lisp,common-lisp
A is a symbol, not a character. The string functions will accept symbols and use the symbol's name, but the character functions only accept true character objects, which are entered using #\ syntax. So you can do: (string< 'a 'a) (string< 'a 'b) For reference: #\a => character "a" =>...
conversion from 'uint64_t' to 'unsigned int'
The "argument" about which the compiler is warning is the i argument to operator[] in v[i] (note that this is the only argument on either of those lines). The parameter of this operator[] overload is of type size_t. In 32-bit builds size_t is a 32-bit unsigned integer. Conversion of the...
How do I only send the differences between two images over the network? [duplicate]
c#,image,sockets,stream,comparison
Here is an improved and (somewhat) bpp independent version of the post linked to in my comment. It creates a fresh Bitmap on both diff'ing and restoring. Here is an example: The full images are 1396x906 pixels and have 103k for input and output images. The diff image is 13k....
Compare code from the files of two directores [closed]
I use total commander for this... the menu command "commands - synchronize directories" ... shows you which files are different, then you have to merge one by one http://www.ghisler.com/screenshots/en/08.html, to merge a pair, just double click it, If you are on linux, then I really can not help
How to compare date in string with sysdate in Oracle?
you're missing the century from your date SELECT CASE WHEN sysdate > to_date('30-Apr-2015','DD-MON-YYYY') THEN '1' ELSE '0' END FROM DUAL ...
compare “int* pointer” with constant memory adress
c,pointers,memory,comparison,microcontroller
The issue is that you are actually doing this: unsigned int * p; if(p<0x2000) {}; Where 0x2000 is an integer. You can resolve this by using a cast: #define ADR 0x2000 unsigned int * p; if(p<(unsigned int*)ADR) {}; Although a better option might be to actually add the cast into...
C - Why compare constants with & instead of switch/if?
c,switch-statement,comparison,ampersand,opensl
That comment is in reference to the event constants. What you're looking at are not event constants, but rather status constants. Event constants would be for example: #define SL_PLAYEVENT_HEADATEND ((SLuint32) 0x00000001) #define SL_PLAYEVENT_HEADATMARKER ((SLuint32) 0x00000002) #define SL_PLAYEVENT_HEADATNEWPOS ((SLuint32) 0x00000004) #define SL_PLAYEVENT_HEADMOVING ((SLuint32) 0x00000008) #define SL_PLAYEVENT_HEADSTALLED ((SLuint32) 0x00000010) You can see...
Python Pandas: How to groupby and compare columns
python,pandas,group-by,comparison
If I understood well your very unclear question, this should do the work: import re import pandas df = pandas.DataFrame([['adamant', 'Adamant Home Network', 86], ['adamant', 'ADAMANT, Ltd.', 86], ['adamant bild', "TOV Adamant-Bild", 86], ['360works', '360WORKS', 94], ['360works ', "360works.com ", 94]], columns=['match', 'name', 'group']) def my_function(group): for i, row in...
String Comparison from text file does not return anything
For one, you're adding line breaks to DriverState that are not present in Yes or No, so both comparisons will always return false. On a side note: the Java naming convention for variables, fields and methods is lower camel case, so driverState instead of DriverState....
Comparing the InnerHTML of an object in jQuery
javascript,jquery,dom,comparison,sharepoint-2013
So, try the following which is a bit easier than what you were trying. var $divNode = $('div'); var html = $divNode.html(); if ( $(html).children().length > 0 ) { alert ("not empty"); } else { alert ("empty"); } Demo...
Python : How to optimize comparison between two large sets?
python,list,optimization,comparison,nlp
You can create a set of your stop_words, then for every word in your text see if it is in the set. Actually it looks like you are already using a set. Though I don't know why you are sorting it. ...
R: Comparing the presence of a string in multiple dataframes
First thing I'd do is to rename the dfs to "legit" R names, such as: DvE.plus DvE.minus and so on. Then I'd get the list of all genes (I'll use only 2 hypothetical dataframes for this demonstration); all.genes <- unique(c(DvE.plus$gene, DvE.minus$gene)) Then I'd regroup the dataframes in a list for...
Conditionally change GetHashCode() when comparing two objects
c#,.net,performance,comparison,gethashcode
Equals / GetHashCode aren't designed to compare things which are "mostly equal". Equality is just a Boolean property in this case. In particular, having a fuzzy "mostly equal" approach leads to problems with transitivity. The documentaiton of Object.Equals includes this requirment: If (x.Equals(y) && y.Equals(z)) returns true, then x.Equals(z) returns...
PHP strict compare two objects is false
Strict compare checks if $a and $b are the exact same object (same memory location). The only way to make them the same (strictly) would be $a = $b; See http://php.net/manual/en/language.oop5.object-comparison.php for reference...
Perl: check in hash if all entries are equal, get an arbitrary/random key from hash
my $key = (keys %hash)[0] should work, or you can force list context by enclosing the scalar you assign to in parentheses: my ($key) = keys %hash; Another way would be to use each in scalar context: my $key = each %hash; In the testing loop, you are only interested...
Comparison between one observation and the others by level of a factor
You can use data.table. library(data.table) df$score=as.numeric(as.character(df$score)) df <- as.data.table(df)[, ratio1:=score/(sum(score)-score) , by = Ident] df Ident iduni score ratio ratio1 1: A_1_2 A_1_2_231 92 NA 0.09246231 2: A_1_2 A_1_2_233 102 NA 0.10355330 3: A_1_2 A_1_2_234 263 NA 0.31917476 4: A_1_2 A_1_2_235 155 NA 0.16630901 5: A_1_2 A_1_2_236 234 NA 0.27432591...
How to test comparison if input will be truncated?
Better Approach is as Follows Scan the number as a String and then convert INT_MAX to String. Use itoa() for this. Make a string comparison and then accordingly print a message. You will not have the problem to store it in any int or float or anything. EDIT:Added a working...
PHP strings have same encoding (UTF8) and appear as identical in browser but are not equal
php,string,curl,utf-8,comparison
If you look at the HTML source code of what you copy pasted here, they are not the same. The second string has an additional entities & # 8203 ; (check the second `') http://pasteboard.co/wBd2Ea4.png...
How to check string is laid out in correct format (Python)
You could either use regular expressions, or try to parse the date with time.strptime and see if there are any exceptions. See https://docs.python.org/2/library/time.html#time.strptime The strptime way could be something like this: try: time.strptime(input_string, "%d-%H.%M") except ValueError: print("Incorrect date format") Be sure to check the docs and see if the placeholders...
How to compare matrix elements to treshold in NumPy
You may use np.searchsorted to obtain the indices: >>> np.array(y)[np.searchsorted(y, X)] array([[ 1. , 3. , 3. ], [ 0.5, 3. , 1. ], [ 5. , 1. , 3. ]]) ...
Which is the quickest of prime generating algorithms?
performance,algorithm,comparison
Your second algorithm is faster. I don't know why you only saw a 20% improvement. Here are the results of my tests, with separate implementations: 10^6: First: 00:00:01.0553813 67240405 steps Second: 00:00:00.2416291 13927398 steps Sieve: 00:00:00.0269685 3122044 steps 10^7: First: 00:00:26.4524301 1741210134 steps Second: 00:00:04.6647486 286144934 steps Sieve: 00:00:00.3011046 32850047...
How do I match a date from a list of dates in excel?
excel,excel-formula,comparison
An alternative approach: Assume Date1-Date4 are in A2:A5, and Date5 is in B2: {=OR(B2=A2:A5)} Note that you need to enter the formula as an array formula using Ctrl+Shift+Enter....
Custom String Deficiency
std::map doesn't use operator == it uses operator <. You need to implement that operator to be able to use your String type as the key of a map. Here is an example - note the const of the parameter and the function - this is required by std::map. In...
Comparing cell contents against string in Excel
string,excel,if-statement,comparison
We need an Array formula. In G2 enter: =NOT(ISERROR(MATCH(1,--EXACT(F$2:F$7,E2),0))) and copy down. Array formulas must be entered with Ctrl + Shift + Enter rather than just the Enter key. Note: The curly brackets that appear in the Formula Bar should not be typed....
Compare two DATETIME fields from multidimensional array and return a value or index
php,mysql,arrays,multidimensional-array,comparison
Thanks to Marc B this got solved. $sql = mysqli_query($conn, "SELECT firstName, greatest(lastLog, lastReceived) AS eligibleTime FROM customers ORDER BY eligibleTime DESC LIMIT 1"); $result = mysqli_fetch_assoc($sql); print_r($result); ...
Comparing float values in bash
bash,if-statement,comparison,bc
In bash, you need to be very careful about spacing. For example: if [ $(echo " 0.5 > $X " | bc -l )==1 ]; then echo grande fi Here, there are no spaces around the ==, so it'll be interpreted as: if [ 0==1 ]; then fi Believe it...
MySQL Comparison Query
Check it using HAVING clause: select Destination_Region, count(*) as Score from pro11 where Destination_Region is not null group by Destination_Region having Score>(SELECT COUNT(*) FROM pro11 WHERE Destination_Region = 'Africa' GROUP BY Destination_Region) order by Score DESC; Sample result in SQL Fiddle....
Ruby comparing biggest potential number
ruby-on-rails,arrays,ruby,comparison
ar = [1,2,99,901] p ar.map(&:to_s).sort.reverse.join.to_i # => 9990121 p ar.sort_by(&:to_s).reverse # => [99, 901, 2, 1] This creates an array of strings,which are sorted alphabetically.This sorting is from low to high - the opposite is needed, so the sorted array is reversed....
In JavaScript, is there any difference between typeof x == 'y' and typeof x === 'y'?
javascript,performance,comparison,undefined,typeof
It makes absolutely no useful difference either way in this case. The typeof operator returns a string indicating the type of the unevaluated operand. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof We know it is always going to be a string, and it will only be that of a few predefined values, so there is no...
How to compare mac-addresses in Perl
How about normalization, make them both upper case, and convert - to :, my $mac1 = "12-23-34-RT-43-23"; my $mac2 = "12:23:34:rt:43:23"; y|[a-z]-|[A-Z]:| for $mac1, $mac2; print "equal\n" if $mac1 eq $mac2; ...
Comparing two images as being identical?
image-processing,comparison,dm-script
I think you need to specify a bit more clearly what you mean by identical. Within the framework of image-analysis in DigitalMicrograph, it could be (f.e.): 1) The identical file on disc. This has been answered by others. But for simplicity - if an image is open in DM you...
Does order of compared literals matter if both are evaluated? [duplicate]
Is there any profit from putting literals that are compared to each other with binary operator in certain order within an if statement? Not in Java, unless you do it with booleans: if (false == flag) In that one case, it helps you avoid this typo: if (flag =...
count how many times characters from a range occur in a string
- has a special meaning in a character class, it denotes a range. Move it to the beginning or end of the class: $ echo :/, | grep -o "[@#$%&*-=+]" | wc -l 3 $ echo :/, | grep -o "[@#$%&*=+-]" | wc -l 0 $ echo :/, | grep...
Excel VBA: Compare Date to List & Return Next Date In List
Assuming that you have a named range TerminationDate and dates in the sheet "Cuttoff Matrix" are put in ascending order, the following function would yield you the msgbox with the next date compared to the date put in Range("TerminationDate"). Private Function Next_Date() Dim rng As Range Dim rngFoundPayGroup As Range...
VB.Net Double comparison after some additions
If you take the example 3 you would see that the result is actually 3.0000000000000009. The problem is in the rounding of a double. If you change the data type decimal the problem is fixed: Sub Main() Dim i As Decimal = 2 For x As Integer = 1 To...
Javascript: Compare backgroundColor set by javascript
javascript,css,background,comparison
Use Window.getComputedStyle() — https://developer.mozilla.org/en-US/docs/Web/API/Window/getComputedStyle.
why the following code gives the first mobile no. irrespective of name
c,string,switch-statement,comparison
You cannot compare strings using = (or even by ==, for that matter) operator. You need to use strcmp() for that. In your code, inside mobileno() function, if( s="katrina" ) is essentially trying to assign the base address of the string literal "katrina" to s. It is nowhere near a...
python:compare values with other values in dictionary [closed]
python,loops,dictionary,random,comparison
something like this might work (not tested), assumes that states and capitals are 1 to 1 and in the right order import random random_state = random.choice(your_dict.get('state') index = your_dict.get('state').index(random_state) answer = your_get_answer_method() #returns the answer, process if needed (lower ... etc) if your_dict.get('capital')[index] == answer: #do some stuff here ...
VBA copy rows after comparing column data
Still not sure what you want to do with the different sheets. But the following macro will copy the rows that are not present in both sheets to the MisMatch worksheet. The Inventory rows are copied first, then a blank line, then the Dev rows. Probably need some formatting to...
Error while comparing data fetched from the table
php,mysql,arrays,error-handling,comparison
mysqli_fetch_row return result row as an enumerated array you can use mysqli_fetch_assoc to get while($array1= mysqli_fetch_assoc($result1)){ ...
python merging pairs lists within sublists within a list by comparing previous pair's second number with next pair's first number [duplicate]
python,list,for-loop,merge,comparison
From the link above: def merge(times): saved = list(times[0]) for st, en in sorted([sorted(t) for t in times]): if st <= saved[1]: saved[1] = max(saved[1], en) else: yield list(saved) saved[0] = st saved[1] = en yield list(saved) >>>mylist = [[[0, 2], [2, 9]], [[3, 7], [7, 9], [9, 12], [15,...
AM/PM comparison in PHP [duplicate]
php,date,datetime,time,comparison
Your variables are strings and you are using the > operator for comparison. You need to convert your strings into a timestamp and then do the comparison. strtotime() is your friend or the DateTime class....
Comparing values after ChangeType not working
c#,if-statement,integer,comparison,changetype
Your problem is that _pkValue and _defaultValue aren't pure integers, they're boxed. The static type of the variables is object, which means that your != operator is checking for reference equality rather than comparing the boxed integer values. You can use the polymorphic Equals method to check for value equality:...
Trying to compare a value to multiple, multiple dimension arrays
Ok, here is how I got it working. Most of this came from another person, but they deleted their comment so I can't thank them. arrCols = Array(arrA, arrB, arrC, arrD, arrE) arrVals = Array("Dog", "Cat", "Bird", "Monkey", "Blue") For i = 2 To rCnt pID = Cells(i, 2).Value pName...
Numpy matrix row comparison
python,performance,numpy,matrix,comparison
Few approaches with broadcasting could be suggested here. Approach #1 out = np.mean(np.sum(pattern[:,None,:] == matrix[None,:,:],2),1) Approach #2 mrows = matrix.shape[0] prows = pattern.shape[0] out = (pattern[:,None,:] == matrix[None,:,:]).reshape(prows,-1).sum(1)/mrows Approach #3 mrows = matrix.shape[0] prows = pattern.shape[0] out = np.einsum('ijk->i',(pattern[:,None,:] == matrix[None,:,:]).astype(int))/mrows # OR out = np.einsum('ijk->i',(pattern[:,None,:] == matrix[None,:,:])+0)/mrows Approach #4...
Why does this string extension method not throw an exception?
c#,null,comparison,ienumerable,argumentnullexception
You are using yield return. When doing so, the compiler will rewrite your method into a function that returns a generated class that implements a state machine. Broadly speaking, it rewrites locals to fields of that class and each part of your algorithm between the yield return instructions becomes a...
PHP compare 2 arrays (Mac donalds and Burger King)
php,html,checkbox,sum,comparison
I made the necessary changes to your code to make it work and do what I think you want. Here it is, the changes are pointed by commented arrows "// <=======", try it and let me know : <html> <head> <link rel="stylesheet" type="text/css" href="style1.css" /> </head> <?php if(isset($_POST['formSubmit'])) { $breakfastMC...
SELECT where date is within X months away regardless of stored year
One approach is to use a conditional test like this: WHERE CONCAT(YEAR(NOW()),DATE_FORMAT(d.deadline,'-%m-%d')) + INTERVAL CONCAT(YEAR(NOW()),DATE_FORMAT(d.deadline,'-%m-%d'))<NOW() YEAR < NOW() + INTERVAL 3 MONTH We can unpack that a little bit. On that first line, we're creating a "next due" deadline date, by taking the current year, and appending the month and...
Comparison between two objects under the same class
if(Object A == Object B) return true; will do the job? No it won't, it won't even compile error: no match for 'operator==' (operand types are 'Fruit' and 'Fruit') You need to implement a comparison operator==, like bool Fruit::operator==(const Fruit& rhs) const { return (apple == rhs.apple) && (banana ==...
Comparing an object with a String using equals() method
java,language-features,comparison
The short answer: You need to override the implementation of equals() in your Flower (note: capital F) class. This will do something you like to do: @Override public boolean equals(Object o) { return (o instanceof Flower && ((Flower)o).flower.equals(flower)) || (o instanceof String && o.equals(flower)); } @Override public int hashCode() {...
testing dynamically created strings
javascript,algorithm,comparison,func
Can't you create a lookup object which holds all the multiplication factors? Think of this as if it were a two-dimensional table: var factors = { a: { b: 16, c: 32, d: 64, e: 256 }, b: { c: 18, d: 20, e: 64, f: 256 } }; Then...
is it safe to use comparison operators on BigDecimal in groovy/grails?
groovy,comparison,operator-keyword
Groovy allows overloading of operators. When a type implements certain methods then you can use a corresponding operator on that type. For + the method to implement is plus, not add. For greater than or less than comparisons, Groovy looks for a compareTo method on the object, and for ==...
Batch - Comparing two txt files
windows,batch-file,text,comparison
The code below keep lines from File2.txt from the first line that differ vs. File1.txt on: @echo off setlocal EnableDelayedExpansion rem Redirect the *larger* file as input < File2.txt ( rem Merge it with lines from shorter file for /F "delims=" %%a in (file1.txt) do ( rem Read the next...
PHP Comparing 0 does not work
The problem is straightforward; look at the outer loop: for ($hour = 0; $hour <= 23; $hour++) { Consider only the first iteration, so $hour is int(0). Further in the code: if(count($myhours) > 0) { for($h = 0; $h <= count($myhours); $h++) { Pay close attention to the loop condition:...
Using Comparison Operators correctly
javascript,html,comparison,operators
You don't have html element with id cg, so this line fails document.getElementById("cg").value. However you have fingers as an html textbox. Also first time using not statements (is it !== or !=?) in HTML/JavaScript. In js, both are valid but they differ in functionality, != has an overhead of conversion....
What is faster: equal check or sign check
java,performance,comparison,equality,cpu-architecture
Assuming those operations are JITted into x86 opcodes without any optimization, there is no difference. A possible x86 pseudo-assembly snippet for the two cases could be: cmp i, 1 je destination and: cmp i, 0 jg destination The cmp operation performs a subtraction between the two operands (register i and...
Is there a detailed comparison between Propel 2 and Doctrine 2
performance,orm,doctrine,comparison,propel
I'm also during making my decision which PHP ORM to choose and recently I found the following comparison of the main features of Doctrine2 and Propel 2: Side by side: Doctrine2 and Propel 2. The comparison is very precise and comprehensive, so surely it can come in handy when making...
Best way to detect changes when values might not exist anymore?
javascript,jquery,jquery-ui,comparison,concatenation
At var initialValues = $(.myNewClass).map(Function(x){ return x.val() }) .myNewClass should be a String , within quotes $(".myNewClass") . F at .map() callback should be lowercase f , to prevent calling native Function . x at first parameter of .map(x) would be the index of the element or object within the...
Java 8: More efficient way of comparing lists of different types?
lambda,comparison,java-8,java-stream
Your question’s code does not reflect what you describe in the comments. In the comments you say that all names should be present and the size should match, in other words, only the order may be different. Your code is List<Person> people = getPeopleFromDatabasePseudoMethod(); List<String> expectedValues = Arrays.asList("john", "joe", "bill");...
Compare two System.Enum of type T
Instead of the impossible button.Identifier == Identifier you should use EqualityComparer<TEnum>.Default.Equals(button.Identifier, Identifier) This avoids boxing the value into an object box (or IComparable box)....
Python: How would I compare two strings using a function with only one of the strings as an argument?
Yes absolutely, this is a reason for having classes. Read up on https://docs.python.org/2/tutorial/classes.html. def myFunction(self, cdate): return self.y == cdate.y and self.z == cdate.z ...
How can I compare two array lists for equality with a custom comparator?
java,generics,collections,comparison
Just implement the method that iterates, and reuse it every time you need it: public static <T> boolean areEqualIgnoringOrder(List<T> list1, List<T> list2, Comparator<? super T> comparator) { // if not the same size, lists are not equal if (list1.size() != list2.size()) { return false; } // create sorted copies to...
Can I use « is » to compare against static variables?
python,enums,comparison,identity,static-variables
Can you? Yes - small integers are interned in CPython, so wherever you get e.g. x = 2 from, x is Color.green will evaluate True. Should you? No. For one thing, it doesn't make conceptual sense - do you really care if they're the same exact object (identity, is), or...
Using comparable to compare different variables
java,libgdx,comparison,comparator,comparable
If you are using this to sort your objects, then your Comparable or Comparator must be well behaved and must respect the transitive and other rules. If not, then your code is broken. It is recommended that your comparing methods be consistent with equals, that means that a.compareTo(b) returns 0...
Ruby: matching a string against another object that may be a string or regexp
This is a shortened version of your approach: def compare(str, thelist) thelist.any? { |item| item.match(str) } end ...
How to compare two arrays in mysql query?
You can do this using find_in_set(): where find_in_set(4, educations) > 0 and find_in_set(6, educations) > 0 However, this is generally inefficient. The problem is your data structure. You should be using a junction table with one column for each education, instead of storing a list of integers in a highly-inappropriate...
Java interface to compare various data types
Something along the lines of: class MyDataType<T extends Comparable<T>>{ T data; public MyDataType(T _data){ data = _data; } } Feels like a homework question. ;)...
Comparing multidimensional arrays using specific key in php
php,arrays,multidimensional-array,comparison,array-difference
You could do something like this in PHP >= 5.5.0: $result = array_diff_key(array_column($array1, null, 'username'), array_column($array2, null, 'username') ); ...
Python compare tuples with different data types but same values
tup1 = (1,2,3) tup2 = ('1',2,3) print(map(str,tup2))== map(str,tup1)) # tuple(map.. python 3 Or if you know they are all ints in one and a mixture of string digits and ints in the other just cast one: tuple(map(int, tup2)) == tup1 If you are using python 2 you can use itertools.izip...
Python: Searching a specific columns of a table for not matching items
You can use zip to get your columns then.You can use a generator expression within all function for checking that all the elements mett the condition : with open("test.txt", "r") as Spenn,open("test.txt", "r") as table: reader = zip(*csv.reader(Spenn, delimiter="\t")) writer = csv.writer(table, delimiter="\t") for row in reader: if all(field not...
Finding a document in RethinkDB that meets multiple criteria
RethinkDB doesn't just run your function on the server, it calls your function once to build up a predicate. (See http://rethinkdb.com/blog/lambda-functions/ .) You can build up the predicate you want and return it like so: r.db('test').table('monstertrucks').filter(function(item) { var pred = r.expr(true); arr = [{attr: "speed", val: 5}, {attr: "power", val:...
find type equality in one array or list and perform operation. C#
Use lambda expressions var vars = expression.Par.Select(x => x.GetType() == typeof(VarExpression)).ToList() ; var cons = expression.Par.Select(x => x.GetType() == typeof(ConstExpression)).ToList() ; Then you can do wherever you want with your expressions...
Apache Hadoop vs Google Bigdata
hadoop,comparison,hdfs,bigdata,gfs
Simple answer would be.. it depends on what you want to do with your data. Hadoop is used for massive storage of data and batch processing of that data. It is very mature, popular and you have lot of libraries that support this technology. But if you want to do...