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GNU Scientific Library
来自开放百科 - 灰狐
（版本间的差异）
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== Example == | == Example == | ||
The following example program calculates the value of the [[Bessel function]] for 5 [http://www.gnu.org/software/gsl/manual/gsl-ref_2.html#SEC10]: | The following example program calculates the value of the [[Bessel function]] for 5 [http://www.gnu.org/software/gsl/manual/gsl-ref_2.html#SEC10]: | ||
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2010年8月17日 (二) 10:10的版本
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
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