The Lehmer code can be used for this. This looks like a pretty decent guide on how to do that: http://www.2ality.com/2013/03/permutations.html

Once we "reach" the fact(1,1), it will "return" to the calling recursive iteration and proceed to the part R is R1*X of that iteration, with R1=1. Then will return again to a previous level and so on. Let's look at a non-trivial iteration: fact(3,R) : X <- 3, X1 <-...

The number of fruit in a pyramid of height n is given by the nth triangular number, given by the equation Tn = n(n + 1) / 2 For example, a pyramid of height 2 holds 2(2 + 1) / 2 = 3 fruit. A pyramid of height 4 holds...

Call it with int *p = new int[10]; Your original code int *p = new int(10); means allocating space for one single int and initialize it as 10, not a 10-element array....

java,arrays,algorithm,permutation,factorial

Creating (or printing) the permutations of an array is much easier done as a combination of recursively and iteratively than purely iteratively. There are surely iterative ways to do it, but it is particularly simple with a combination. Specifically, note that there are by definition N! permutations of a length...

assembly,x86,factorial,largenumber

128 bits is too big for mul instruction, which saves only 64-bits result (EDX (32bits) + EAX (32bits)). So first of all you need 4 DWORDS of memory to store 128bits result. Then you should replace your mul ebx; on some procedure call, that can handle 128bits multiplication. The code...

If the result is guaranteed to be an integer, work with the factored representation. By the theorem of Legendre, you can express all these factorials by the sequence of exponents of the primes in the range (2,n). By deducting the exponents of the factorials in the denominator from those in...

Using: for(var i = num - 1; i > 0; i--) { return num * i; } It will return num*(num-1) value. Since it will return the value in the first iteration. Instead use: Using recursion: function FirstFactorial(num) { if(num==1) return num; else return num*(FirstFactorial(num-1)) } or: fact=num; for(var i...

c,factorial,comparison-operators

The condition in the for loop is a while condition: int i = 1; while(i == n) { //loopbody fact=fact*i; i++; } So it will only do anything when n==1, plus the loop can only run 0 or 1 times....

You need to use the which argument in TukeyHSD; "listing terms in the fitted model for which the intervals should be calculated". This is needed because you have a non-factor variable in the model ('baseline'). The variable causes trouble when included, which is default when which is not specified. ANC...

c,debugging,factorial,largenumber

Leaving aside style questions and the fact that storing a big integer in decimal digits is rather wasteful, the problem is that you never reset j. Because of this, the loop while(index<no) { x=a[index]*i+carry; a[index]=x%10; j++; if(x!=0) carry=x/10; index++; } means that j will at least double in every multiplication,...

It needs no global variable and no local variable, too. function factorialize(num) { if (num === 1) { return 1; } return num * factorialize(num - 1); } out(factorialize(5)); // or a very short version: function f(n) { return +!~-n || n * f(n - 1); } out(f(10)); function out(s,...

The Intel manual lists the following variants of IMUL: F6 /5 IMUL r/m8* M Valid Valid AX? AL * r/m byte. F7 /5 IMUL r/m16 M Valid Valid DX:AX ? AX * r/m word. F7 /5 IMUL r/m32 M Valid Valid EDX:EAX ? EAX * r/m32. REX.W + F7 /5...

If you invoke fact(5), here is how it will work: fact(5) 5*fact(4) 4*fact(3) 3*fact(2) 2*fact(1) 2*1=2 //(since if n==1, 1 is returned directly result=2 result=3*2 result=4*3*2 result=5*4*3*2 result=120 Recursion simply means you invoke a method within itself, usually after manipulating the argument to suit your end result (n - 1...

It returns 0 because count will be finally 0 in your last loop. Loop will execute for count = 1 and you will multiply hold by 0 since you subtract 1 from count before multiplying. You have to subtract 1 after multiplication: def factorial(x): hold = 1 count = x...

Change for ( i = 1; i < userNumber; i++ ) { to for ( i = userNumber - 1; i > 1; --i ) { Note that your code changes userNumber in the loop body, so that the loop will only terminate if userNumber overflows....

As others have said you can use libraries that support larger numbers, or just don't allow values that are too big. Note that if you want to handle very large values you might need to use a loop rather than a recursive algorithm because recursion can cause a Stack Overflow....

c,function,recursion,return,factorial

Sure. you forgot to return a value at the very the end of recursion(). Without that return statement, the use of recursion() as an argument ot printf() invokes undefined behaviour. To elaborate, only for the case when x == 0 is TRUE, you're using a return statement to return a...

This is the Taylor's series development of exp(-x). Recognizing this gives you a good opportunity to check your result against math.exp(-x). Simple syntax improvements You don't need an 'else' after the while. Just add the code to be run after the loop at the same indentation level as before the...

This is because BigInteger is immutable which means that its value does not change. So first.add(x) will create a new BigInteger containing the computations result, i.e. just reassign the result to first, like first = first.add(...).

You do it the usual Prolog way - by defining a recursive rule that covers two clauses: When the number is 0, its factorial is 1 - This can be done with a simple fact. When the number is greater than zero, compute Number-1, obtain its factorial, and multiplying the...

javascript,math,factorial,largenumber

If you do not require cancellation beyond exact numbers, this should do: var x = [3, 4, 6, 4]; var y = [4, 7, 3, 2]; for(var i in x) { for(var j in y) { if(x[i]==y[j]) { x.splice(i,1); y.splice(j,1); } } } console.log(x); console.log(y); But in case you are...

algorithm,assembly,8086,factorial

Which part is unclear? First it reads an integer using geti which utilizes the well known x = 10*x + c - '0' formula to convert string to number. Then it initializes the bignum accumulator to 1 and multiplies it by the input number using bignum_mul in a loop, counting...

You forgot the return value n = in the very first line just after function, it will never return anything otherwise function n = fac(n) if (n<=0) then n = 1 else n = n* fac(n-1) end endfunction ...

Just change the last part of your program to: result = 1 for f in factors: result *= f print result ...

c++,distribution,factorial,poisson

One workaround to deal with large n's is calculating the distribution in the log domain: X = ((e^-lambda)*(lambda^n))/n! ln X = -lambda + n*ln(lambda) - Sum (ln(n)) return e^X ...

Yes it is. But since it's recursion, it works the opposite way. I once had an interviewer explain it to me like this : Say, for fact(5) : - fact(5) = 5 * fact(4) - fact(4) = 4 * fact(3) - fact(3) = 3 * fact(2) - fact(2) = 2...

return factValue * printFactorial(factValue - factCounter); I assume that you should be using the "next" values instead of these. Edit: Also note that the function takes two parameters and is void. Returning factValue times void doesn't make sense....

You need parentheses: main = do print (fact 4) What GHC is seeing is fact and 4 being passed as separate arguments to print, but what you want is to apply 4 to fact, then apply that result to print. You could also use main = do print $ fact...

python,series,factorial,exponential

Move your sumt variables into your while loop, and then break out of the loop when sumt5 <= 0.00: import decimal def fact(n): if n == 0: return 1 else: return n*(fact(n-1)) x = 1 # Hardcoded for this example, instead of prompting. A = 0 summation = 1.0 while...

scanf("%d",l); you need to insert the address of l, which is &l. You should also use %u for unsigned ints, not %d....

There's a factorial function in scipy.misc which allows element-wise computations on arrays: >>> from scipy.misc import factorial >>> factorial(mat) array([[ 1., 2., 6.], [ 2., 6., 24.]]) The function returns an array of float values and so can compute "larger" factorials up to the accuracy floating point numbers allow: >>>...

python,loops,factorial,floating

def main(): # take input from the user num = float(input("Enter a number: ")) if (num%1 != 0): print("Bad entry, only integers are accepted.") return num = int(num) factorial = 1 if num > 100: print("Bad entry. It should be an integer less than or equal to 100!") print("Please try...

You have to import the math module first: import math math.factorial(x) ...

you can try like: input = Integer(gets.chomp) ans = 1 for i in 1..input ans = ans*i end print(ans) ...

Is there a difference in the order that the multiplications are done in a recursive factorial function depending on whether the last return is in the form fact(n-1) * n compared to the form n * fact(n-1) ? No there will be no difference The Commutative Laws say we...

python,functional-programming,factorial

In addition to indentation mistakes, you need to move this line out of the function, x = raw_input(":"), or you have to input a number at every level of recursion....

You are essentially doing this wrong. See the R help page for factorial: ‘factorial(x)’ (x! for non-negative integer ‘x’) is defined to be ‘gamma(x+1)’ and ‘lfactorial’ to be ‘lgamma(x+1)’. You are not supposed to compute it this way. Why? Well look at this: R> evalCpp("INT_MAX") [1] 2147483647 R> You will...

assembly,x86,factorial,multiplying

479001600*13=6227020800, or, 0x17328CC00 in hex. This is too big for 32bits. 1*0x100000000=0x100000000 0x17328CC00-0x100000000=0x7328CC00, or 1932053504 in decimal. So, no news here. Put another way, your results are 1 in EDX and 1932053504 in EAX. EDX contains the higher-order 32 bits of the result, so multiply by 2^32, ie. 0x100000000: 1...

java,c++,c,recursion,factorial

This is the simplest I could get it: int sum_fac(int target, int counter) { return (target == counter) ? target : counter * (1 + sum_fac(target, counter + 1)); } Which when called like this: int main() { for (int i = 1; i < 10; i++) { printf("%d: %d\n",...

Before the call factorial the argument (5) is pushed onto the stack. At that moment in time, the stack pointer esp points to the argument value 5 (the address in esp is the address of the argument) When the call factorial occurs, the program counter (PC) is saved by...

i and fact(i+1) are both ints, so you're performing integer division. Since i < fact(i+1), each such term will produce a zero. You had the right idea with defining sign as a double, but since / and * have the same precedence, you're first performing an integer division and only...

java,table,caching,hashmap,factorial

OK, I'll give it a shot. Let me first give you the full code answer, and get into each change in details: public static void main(String[] args) { int input = 0; try (Scanner reader = new Scanner(System.in)) { Map<Integer, Integer> cache = new HashMap<Integer, Integer>(); cache.put(1, 1); while (true)...

The expression return input *factorial(input--); does a post increment of input. The value passed to factorial is still input. Not only that, you are also in undefined behavior territory since, input is also used in the expression. Given input = 3, input *factorial(input--); would easily be: 2 *factorial(3); or 3...

Your code is an Oz script. It can be used in the interactive Mozart IDE (Emacs). The online compiler expects an Oz program, i.e. a functor definition. Try this code: functor import Application System define fun {Fact N} fun{Aux N Nmax FactNminus1} if N > Nmax then nil else (FactNminus1*N)|{Aux...

javascript,recursion,arguments,factorial

No, because is a recursive function so, when last function end ("all") then all previous console.log will print in reverse order (really is not reverse order, it's the correct order because is a recursive function), for example, we have the 5 steps that you say: (n=4, n=3 ... n=0): f4...

algorithm,complexity-theory,factorial

Here's your algorithm! import math def eat_cpu(n): count = 0 for _ in xrange(math.factorial(math.factorial(n))): count += 1 return count eat_cpu(4) It is a function that calculates (n!)! using the method of incrementation. It takes O((n!)!) time. Actually, upon reflection, I realized that this algorithm is also O((n!)!): def dont_eat_cpu(n): return...

javascript,arrays,nested-loops,nan,factorial

Wrong (or at least: odd) things in your code: f is a number. You seem to expect your function to return an array, though? i <= params.length should be i < params.length. Array indices start at 0, and end at length-1. You are multiplying your accumulator variable with params[j] -...

java,string,loops,if-statement,factorial

The expression fact = fact * c; multiplies fact by c and stores the result in fact. Thus the following happens when the code is run: At the start , fact is 1. On the first iteration it gets multiplied by 1 the result of which is 1. On the...

Just change where you are printing the value else { n = n * factorial(n - 1); // Recursive case cout << " going up" << n << " "; return n; } to else { cout << " going down" << n << " "; n = n *...

java,algorithm,for-loop,permutation,factorial

please see, int n=3, fact = 1; for (; n > 0; n--) { fact = fact * n; } System.out.println("The result is " + fact); ...

(This answer is a spin-off of the discussion of modular factorials in the comments.) Computing modular factorials by taking mods at each step is definitely the way to go and can be used in conjunction with Wilsons's Theorem to give an (impractical) way to test for primes: def modFact(k,n): #computes...

{ long int n=0,facto=1,ln=0; int zcount=0,i=1; printf("Enter a number:"); scanf("%ld",&n); if(n==0) { facto=1; } else { for(i=1;i<=n;i++) { facto=facto*i; } } printf("%ld\n",facto); while(facto>0) { ln=(facto%10); facto/=10; //here you done one mistake if(ln!=0) //another one here { break; } else { zcount+=1; } } printf("Tere are Total %d Trailing zeros in...