📄 specfun_e.c
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#include <stdio.h>#include <gsl/gsl_errno.h>#include <gsl/gsl_sf_bessel.h>intmain (void){ double x = 5.0; gsl_sf_result result; double expected = -0.17759677131433830434739701; int status = gsl_sf_bessel_J0_e (x, &result); printf ("status = %s\n", gsl_strerror(status)); printf ("J0(5.0) = %.18f\n" " +/- % .18f\n", result.val, result.err); printf ("exact = %.18f\n", expected); return status;}
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