Calculating sine of radian in C
180 / pi is one radian IN DEGREES. But the sin() function takes a value in radian. So it's just sin(1).
Error:identifier tgamma is undefined in c++ although is included
c++,identifier,math.h,gamma-function
The reason why you cannot use tgamma is because your compiler doesn't support the standard in which it was introduced. You'll need to use a compiler / standard library that does support c++11 or use another implementation of tgamma as advised in an answer to in a similar question What...
C++ math functions can be used without including the directive “math.h” in VS 2013
Any standard header is allowed to include any other standard header.
double to int conversion not working using math.h functions in c
c,int,double,type-conversion,math.h
The trigonometric functions in math.h use radians, not degrees. You can convert the radians to degrees by multiplying by 180 / pi, ( 57.29577951308232). acos(0.13) would return 1.440427347091751 radians which multiplied by 57.29577951308232 gives the result of 82.53040768358306 degrees....
log(10.0) can compile but log(0.0) cannot?
gcc can use builtin functions in many cases, their documentation says: Many of these functions are only optimized in certain cases; if they are not optimized in a particular case, a call to the library function is emitted. so therefore gcc will not need to link against the math library...
C: Better method for rounding down double to int
c,floating-point-conversion,math.h
They are fundamentally different. Cast to int will truncate the non-integer part toward 0. floor will do the same, but toward, -infinity. Example: double d = -1.234; printf("%d %d\n", (int)d, (int)floor(d)); Yields: -1 -2 ...
'floor': identifier not found
This is quite strange behavior for MSVS. 1) Try to create empty project (without precompiled headers) 2) Try changing #include <math.h> to #include <cmath> If this not help as well as creation of new empty project, the only way is to ensure that no viruses at your PC and re-install...
Math.h not working properly?
I think you have missing parentheses. In the output line, the first value is (data[i][8]/dp)/2, but that's not what you're using in function call (spaces added for clarity): -log( tan( acos( data[i][8]/dp ) /2) ) Correct line should be: cout << (data[i][8]/dp)/2 << " : " << -log(tan(acos((data[i][8]/dp)/2))) << endl;...
math functions in thread returning wrong values, with android ndk
android,c++,math,android-ndk,math.h
I Finally got to some conclusion about how to "solve" the problem, though I am kinda lost why this was happening in the first place. I am actually coding an app which links to several c++ libraries, which is the common code between iOS and Android apps. When the math...
Over 200 ~SYNTAX ERRORS~ in math.h for visual studio, which doesn't make sense
c++,visual-studio-2013,compilation,syntax-error,math.h
The problem could be the header itself - C++ has provided its own equivalent libraries for old C libraries. They take the format of: c[library name] Where [library name] is replaced by the old C library MINUS the .h extension. To include math.h from the C library in a C++...
C1083: Cannot open include file: math.h: No such file or directory
c++,visual-studio,include,math.h
Right-click your project, go to Properties, then go to VC++ Directories and open the editor for Include Directories. There should be a tick box labelled "Inherit from parent or project defaults". You will see that Visual Studio includes some predefined directories. If the box is already ticked and Visual Studio...
pow function not working properly in Code::Blocks IDE
printf("Hello world! %d\n",pow(2,2)); "The output of this code should be Hello world! 4 right?" No. As this is undefined behavior, anything can happen. As @Mureinik posted what likely happens in this errant situation, you could have a possible understanding of why you saw 0. But in the end, C does...
The output of ceil() and floor() in C language is odd
Your array is declared as: solvent_p solvent[4000]; but you have this loop: for(i=0;i<=9999;i++) with this function call inside: printf("1 :%d \t %f \t %f \n",j,solvent[j].rx,solvent[i].ry); which means you are accessing out-of-bounds array elements. EDIT: OP test case has been edited to fix the out-of-bound accesses. My second suggestion is to...
C - undefined reference to “sqrt” even with '-lm'
I don't think that is the command you're running (well, it may be one of them, but it's certainly not the one causing your error). The -c option to gcc tells it to only create the object files (and you're specifically sending the output to sparse_matrix.o, an object file rather...