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specfun.c
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#include
<stdio.h>
#include
<gsl/gsl_sf_bessel.h>
int
main
(
void
)
{
double
x
=
5.0
;
double
expected
=
-
0.17759677131433830434739701
;
double
y
=
gsl_sf_bessel_J0
(
x
);
printf
(
"J0(5.0) = %.18f\n"
,
y
);
printf
(
"exact = %.18f\n"
,
expected
);
return
0
;
}