42 lines
668 B
C
42 lines
668 B
C
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/* Driver for routine fred2 */
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#include <stdio.h>
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#include <math.h>
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#define NRANSI
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#include "nr.h"
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#include "nrutil.h"
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#define N 8
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#define PI 3.1415927
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float g(float t)
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{
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return sqrt(t)-pow(PI/2.0,2.25)*pow(t,0.75)/2.25;
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}
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float ak(float t,float s)
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{
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return pow(t*s,0.75);
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}
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int main(void)
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{
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int i;
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float a=0.0,b=PI/2.0,*f;
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float *t,*w;
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t=vector(1,N);
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f=vector(1,N);
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w=vector(1,N);
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fred2(N,a,b,t,f,w,g,ak);
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/* Compare with exact solution */
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printf("Abscissa, Calc soln, True soln\n");
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for (i=1;i<=N;i++) printf("%10.6f %10.6f %10.6f\n",t[i],f[i],sqrt(t[i]));
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free_vector(w,1,N);
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free_vector(f,1,N);
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free_vector(t,1,N);
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return 0;
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}
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#undef NRANSI
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