GNU Scientific Library

2013年2月20日 (三) 01:53的最后版本

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[编辑] Example

The following example program calculates the value of the Bessel function for 5 [1]:

#include <stdio.h>
#include <gsl/gsl_sf_bessel.h>

int
main (void)
{
  double x = 5.0;
  double y = gsl_sf_bessel_J0 (x);
  printf ("J0(%g) = %.18e\n", x, y);
  return 0;
}

The example program has to be linked to the GSL library upon compilation:

g++ -L/usr/local/lib example.c -lgsl -lgslcblas  -lm

The output is shown below, and should be correct to double-precision accuracy:

J0(5) = -1.775967713143382920e-01

http://www.gnu.org/software/gsl/