xavevar.c

< C语言数值算法程序大全>>配套程序

/* Driver for routine avevar */

#include <stdio.h>
#include "nr.h"
#include "nrutil.h"

#define NPTS 1000
#define EPS 0.1

main()
{
	int i,j;
	long idum=(-5);
	float ave,shift,vrnce,*data;

	data=vector(1,NPTS);
	/* generate gaussian distributed data */
	printf("\n%9s %11s %12s\n","shift","average","variance");
	for (i=1;i<=11;i++) {
		shift=(i-1)*EPS;
		for (j=1;j<=NPTS;j++)
			data[j]=shift+i*gasdev(&idum);
		avevar(data,NPTS,&ave,&vrnce);
		printf("%8.2f %11.2f %12.2f\n",shift,ave,vrnce);
	}
	free_vector(data,1,NPTS);
	return 0;
}