?? variance.c
字號(hào):
/* file : variance.c
* purpose : calculate the variance of a data set
*/
#include <math.h>
double
variance(vec,ave,len)
double *vec; /* pointer to the vector */
double ave; /* median value of the data set */
int len; /* length of the vector */
{
int i;
double sum,tem;
sum=0.0;
for (i=0;i<len;i++)
{
tem=vec[i]-ave;
tem=tem*tem;
sum+=tem;
}
sum=sum/len;
sum=sqrt(sum);
return(sum);
}
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