Example: Line Fit
#include <stdio.h> void linefit () { /* Declarations. */ int n; /* number of points */ float *x, *y; /* x- and y-values of points */ double sx, sy; /* sums for x and y, respectively */ /* Create arrays with desired size. */ printf ("Number of points: "); scanf ("%d", &n); x = (float *) malloc (n*sizeof(float)); y = (float *) malloc (n*sizeof(float)); /* Read the data points. */ { int i; for ( i = 0; i < n; i++ ) { printf ("X-value for point %d: ", i+1); scanf ("%f", &x[i]); printf ("Y-value for point %d: ", i+1); scanf ("%f", &y[i]); } } /* Accumulate sums sx and sy in double precision. */ sx = 0.0; sy = 0.0; { int i; for ( i = 0; i < n; i++ ) { sx += x[i]; sy += y[i]; } }