39 lines
660 B
C
39 lines
660 B
C
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/* Driver for routine zriddr */
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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 N 100
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#define NBMAX 20
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#define X1 1.0
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#define X2 50.0
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static float fx(float x)
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{
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return bessj0(x);
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}
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int main(void)
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{
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int i,nb=NBMAX;
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float xacc,root,*xb1,*xb2;
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xb1=vector(1,NBMAX);
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xb2=vector(1,NBMAX);
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zbrak(fx,X1,X2,N,xb1,xb2,&nb);
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printf("\nRoots of bessj0:\n");
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printf("%21s %15s\n","x","f(x)");
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for (i=1;i<=nb;i++) {
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xacc=(1.0e-6)*(xb1[i]+xb2[i])/2.0;
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root=zriddr(fx,xb1[i],xb2[i],xacc);
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printf("root %3d %14.6f %14.6f\n",i,root,fx(root));
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}
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free_vector(xb2,1,NBMAX);
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free_vector(xb1,1,NBMAX);
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return 0;
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}
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#undef NRANSI
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