re: Newbie question: read .csv, .dat, and .txt file into 2 dimensional array

[taquito]

I just started to learn C. This is a very simple question, so please forgive me for posting this here.

I have a set of data in, let's say, .txt file. this txt file is in tab-delimited, like

1 4 9
2 6 10
3 7 11
4 8 12

Using fopen and while loop, I managed to print out the data line by line.

#include <stdio.h>
#include <stdlib.h>

int main()
{
FILE *fp;
char filename[80], ss[256];

printf("Filename=: ");
gets(filename);

if ((fp=fopen(filename,"r")) == NULL)
{
printf("Cannot open file.\n");
exit(1);
}

while (fgets(ss,256,fp) != NULL)
{
printf("%s",ss);
}


fclose(fp);

return 0;
}

What I would like to do as a first practice is compute the mean of each column. This data is recorded in x.xxx, so I should use double, right? So I would define

double mean(double x);

double arr[MAX_SIZE][MAX_SIZE];
int j,k;

and

double mean(double x)
{

double m;
for (k=1;k<=MAX_SIZE;k++)
{
m=data[][k]/MAX_SIZE;
std=
}
return m;
}

Is this right? I appreciate if someone could help. I just want to take advantage of compiler to shorten computing times as matlab takes a lot of time to process large data......

Thanks very much.

Taka