# Project #30800 - Computer Science - Array & I/O File Reading

#include <stdio.h>
#include <math.h>

#define MAXDATA 1000

float cor(float[], float[], int);

int main() {
int numdata;
float x[MAXDATA];
float y[MAXDATA];
float correlation;

/* (1) The first line of the file 'test.dat' consists of a single */
/* integer indicating the number of lines of data that follow.    */
/* Read the integer into the variable 'numdata'.  If the value    */
/* is greater than MAXDATA, print an error message and return.    */

/* (2) The 'numdata' lines in 'test.dat' consist of two floating- */
/* point number separated by a comma.  For each line, read the    */
/* first number into the array x[] and the second number into     */
/* the array y[].  Close the file after you have read all of      */
/* the data.                                                      */

/* Call the correlation() function - DON'T CHANGE THIS            */
correlation = cor(x, y, numdata);

/* (3) Open the file 'test.out' for writing.  Write the following */
/* message to the file:                                           */
/*       "The correlation is ."                      */
/*                               ^^^^^^                           */
/*                   replace with value of correlation            */
/* Close the file after you have written the output.              */

return 0;
}

/* cor() - compute the correlation of the data in x[] and y[] */
/*   x[] - first data array                                   */
/*   y[] - second data array                                  */
/*   len - length of x[] and y[]                              */

float cor(float x[], float y[], int len) {
float sumx = 0.0;
float sumy = 0.0;
float sumx2 = 0.0;
float sumy2 = 0.0;
float sumxy = 0.0;
float ans, num, den;
int i;

for (i = 0; i < len; i++) {
sumx += x[i];
sumy += y[i];
sumx2 += (x[i] * x[i]);
sumy2 += (y[i] * y[i]);
sumxy += (x[i] * y[i]);
}

num = ( len * sumxy - sumx * sumy );
den = sqrt(len * sumx2 - sumx * sumx) * sqrt(len * sumy2 - sumy * sumy );
ans = num / den;

return ans;
}

 Subject Computer Due By (Pacific Time) 05/12/2014 11:30 pm
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