62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
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/* Driver for routine cosft1 */
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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 EPS 1.0e-3
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#define NP 17
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#define WIDTH 30.0
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#define PI 3.1415926
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int main(void)
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{
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int i,j,nlim;
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float big,per,scal,small,*data;
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data=vector(1,NP);
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for (;;) {
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printf("Period of cosine in channels (2-%2d)\n",NP);
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scanf("%f",&per);
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if (per <= 0.0) break;
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for (i=1;i<=NP;i++)
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data[i]=cos(2.0*PI*(i-1)/per);
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cosft1(data,NP-1);
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big = -1.0e10;
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small=1.0e10;
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for (i=1;i<=NP;i++) {
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if (data[i] < small) small=data[i];
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if (data[i] > big) big=data[i];
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}
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scal=WIDTH/(big-small);
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for (i=1;i<=NP;i++) {
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nlim=(int) (0.5+scal*(data[i]-small)+EPS);
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printf("%4d %6.2f ",i,data[i]);
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for (j=1;j<=nlim+1;j++) printf("*");
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printf("\n");
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}
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printf("press RETURN to continue ...\n");
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(void) getchar();
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cosft1(data,NP-1);
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big = -1.0e10;
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small=1.0e10;
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for (i=1;i<=NP;i++) {
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if (data[i] < small) small=data[i];
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if (data[i] > big) big=data[i];
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}
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scal=WIDTH/(big-small);
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for (i=1;i<=NP;i++) {
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nlim=(int) (0.5+scal*(data[i]-small)+EPS);
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printf("%4d ",i);
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for (j=1;j<=nlim+1;j++) printf("*");
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printf("\n");
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}
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}
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free_vector(data,1,NP);
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return 0;
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}
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#undef NRANSI
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