Re: gcc and j0,j1,jn, y0, y1, yn

["Eric G . Miller" <egm2@jps.net>]

On Mon, Oct 30, 2000 at 03:32:54PM -0500, mgi@vt.edu wrote:
> 
> It appears that the bessel functions j0, j1, jn, and y0, y1, yn are
> included in the libc as documented in the man page.
> 
> However, it appears that gcc needs some option flags for these
> functions to be found in the include file bits/mathcall.h
> 
> Any suggestions which flag would do the trick?

Like:

/* my_j0.c: Test bessel function */
#include <stdio.h>
#include <math.h>

int
main(void) {
	double answer = j0(1.2345);
	fprintf(stderr, "answer = %f\n", answer);

	return 0;
}

$ gcc -g -o my_j0 my_j0.c -lm

Have to link to the math library.  No idea what they're used for...

-- 
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