QUOTE(jeronimo0d0a @ 15 May, 2008 - 08:07 AM)
It does print the sums of the columns, but you have your getchar() before that so they don't stay on screen. Are you trying to line them up under the columns? If you could clarify the question I'd be happy to help.
thanx but when i looked at it again i noticed the getchar(), but now im having problem of printing an array thats not from file but from data iv worked out using the summation. il post what i have done so far.
CODE
#include <stdio.h>
#define M 21
#define N 2
void main ()
{
float a[M][N];
FILE *ifp, *ofp;
int i, j;
float sum_x, sum_x2, sum_x3, sum_x4;
float sum_y, sum_yx, sum_yx2;
float delta_array[3][3], a1, a2, a3;
for(i=0;i<M;i++)
{
for(j=0;j<N;j++)
{
a[i][j]=0;
}
}
ifp=fopen("in.dat.txt", "r");
for(i=0; i<M; i++)
{
for(j=0;j<N;j++)
{
fscanf(ifp," %f", &a[i][j]);
printf("%9.3f\t", a[i][j]);
}
printf("\n");
}
for(i=0; i<M; i++)
{
sum_x+=a[i][0];
sum_y+=a[i][1];
sum_x2+=sum_x*sum_x;
sum_x3+=sum_x2*sum_x;
sum_x4+=sum_x3*sum_x;
sum_yx+=sum_y*sum_x;
sum_yx2+=sum_y+sum_x2;
}
printf("\n");
printf("The sum of x is %f\n", sum_x);
printf("The sum of y is %f\n", sum_y);
printf("The sum of x^2 is %f\n", sum_x2);
printf("The sum of x^3 is %f\n", sum_x3);
printf("The sum of x^4 is %f\n", sum_x4);
printf("The sum of y*x is %f\n", sum_yx);
printf("The sum of y*x^2 is %f\n", sum_yx2);
delta_array= {{M, sum_x, sum_x2}, {sum_x, sum_x2, sum_x3}, {sum_x2, sum_x3, sum_x4}};
for(i=0; i<3; i++)
{
for(j=0;j<3;j++)
{
printf("Delta array[%f][%f]\n %f", i, j, delta_array);
}
printf("\n");
}
getchar();
}
so if someone can tell me what im doing wrong and what i need to do to correct it it'l help with the other 3 arrays that i need to make as well.
Regards Nir03
15 May, 2008 - 02:38 AM
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