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Join Date: Sep 2007
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Newbie Poster
I am new to programming in C and I'm trying to write a random number generator with a Gaussian distribution with user-defined mean and variance. I've looked at the code given in "Numerical Recipes in C" but I don't understand it very well. If anyone could point me in the direction of a tutorial or any other help it would be greatly appreciated.
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Join Date: Oct 2006
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What didn't you understand. Try a google search. Here is alink and a sample program:
http://www.taygeta.com/random/gaussian.html
http://www.physics.unlv.edu/~pang/comp2/code213.c
http://www.taygeta.com/random/gaussian.html
http://www.physics.unlv.edu/~pang/comp2/code213.c
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Join Date: Dec 2006
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Posting Whiz in Training
So which part fo the code u dont understand well? Where did u get the code from?
ssharish
ssharish
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Newbie Poster
When compiling the code given in "Numerical Recipes In C" I get undefined refrecence errors relating to 'main' and the log and sqrt functions. I'm not sure why I'm getting these. I am using gcc in Linux.
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Posting Whiz in Training
looks like you havn't included the math.h header file. Do this at top
ssharish
#include <math.h>
ssharish
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>I get undefined refrecence errors relating to 'main' and the log and sqrt functions. I'm not
>sure why I'm getting these. I am using gcc in Linux.
I'll make an educated guess and say that you didn't link with the math library:
>sure why I'm getting these. I am using gcc in Linux.
I'll make an educated guess and say that you didn't link with the math library:
$ gcc main.c -lm $ ./a.out
I'm here to prove you wrong.
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I have included math.h. I ran into the same problem when using acos to define pi in another program. When I replaced acos with atan it compiled and worked correctly.
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Posting Whiz in Training
well, did u try Narue's solution, that could solve the problem as well.
That way you link the library directly to the object file of the code at linking time. And make sure the -lm should be at the end.
ssharish
That way you link the library directly to the object file of the code at linking time. And make sure the -lm should be at the end.
ssharish
Last edited by ssharish2005 : Sep 13th, 2007 at 9:32 am.
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Originally Posted by mitzoff 
I have included math.h. I ran into the same problem when using acos to define pi in another program. When I replaced acos with atan it compiled and worked correctly.
Strange?
#include <stdio.h>
#include <math.h>
#include <string.h>
int main ( void )
{
float t = acos( 0.3 );
printf( "%f",t );
return 0;
}output
thwee@thwee-desktop:~$ gcc -Wall pedantic.c -lm thwee@thwee-desktop:~$ ./a.out 1.266104
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