42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
#include <gsl/gsl_sf_bessel.h>
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#include <stdio.h>
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#include <math.h>
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int main() {
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int lMax;
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while (1 == scanf("%d", &lMax)) {
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double x;
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if (1 != scanf("%lf", &x))
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abort();
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double gsl[lMax+2], relerr[lMax+1], orig[lMax+1];
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for (int l = 0; l <= lMax; l++)
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if (1 != scanf("%lf", orig+l))
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abort();
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#if defined JTEST || defined DJTEST
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if (gsl_sf_bessel_jl_array(lMax+1, x, gsl))
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#elif defined YTEST || defined DYTEST
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if (gsl_sf_bessel_yl_array(lMax+1, x, gsl))
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#else
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if (gsl_sf_bessel_jl_steed_array(lMax+1, x, gsl))
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#endif
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abort();
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#if defined DJTEST || defined DYTEST || defined DJTEST_STEED
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for (int l = 0; l <= lMax; l++)
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gsl[l] = -gsl[l+1] + (l/x) * gsl[l];
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#endif
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printf("x = %.16g, lMax = %d:\nsage: ", x, lMax);
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for (int l = 0; l <= lMax; l++)
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printf("%.16g ", orig[l]);
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printf("\ngsl: ");
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for (int l = 0; l <= lMax; l++)
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printf("%.16g ", gsl[l]);
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printf("\nrell: ");
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for (int l = 0; l <= lMax; l++)
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printf("%.16g ", 2 * fabs(gsl[l] - orig[l]) / (fabs(gsl[l]) + fabs(gsl[l])));
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putchar('\n');
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}
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return 0;
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}
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