47 lines
879 B
C
47 lines
879 B
C
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/* Driver for routine splie2 */
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#include <stdio.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 M 10
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#define N 10
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int main(void)
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{
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int i,j;
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float x1x2,*x1,*x2,**y,**y2;
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x1=vector(1,N);
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x2=vector(1,N);
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y=matrix(1,M,1,N);
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y2=matrix(1,M,1,N);
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for (i=1;i<=M;i++) x1[i]=0.2*i;
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for (i=1;i<=N;i++) x2[i]=0.2*i;
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for (i=1;i<=M;i++)
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for (j=1;j<=N;j++) {
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x1x2=x1[i]*x2[j];
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y[i][j]=x1x2*x1x2;
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}
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splie2(x1,x2,y,M,N,y2);
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printf("\nsecond derivatives from SPLIE2\n");
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printf("natural spline assumed\n");
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for (i=1;i<=5;i++) {
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for (j=1;j<=5;j++) printf("%12.6f",y2[i][j]);
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printf("\n");
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}
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printf("\nactual second derivatives\n");
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for (i=1;i<=5;i++) {
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for (j=1;j<=5;j++) printf("%12.6f",2.0*x1[i]*x1[i]);
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printf("\n");
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}
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free_matrix(y2,1,M,1,N);
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free_matrix(y,1,M,1,N);
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free_vector(x2,1,N);
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free_vector(x1,1,N);
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return 0;
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}
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#undef NRANSI
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