Hello,

I am a very basic user and do not know much about commands used in C, so please bear with me...I cant use very complicated codes. I have some knowledge in the stdio.h and ctype.h library, but thats about it. I have a matrix in a txt file and I want to load the matrix based on my input of number of rows and columns

For example, I have a 5 by 5 matrix in the file. I want to extract a specific 2 by 2 submatrix, how can I do that ?

I created a nested loop using :

FILE *sample
sample=fopen("randomfile.txt","r"); 
for(i=0;i<rows;i++){
  for(j=0;j<cols;j++){
     fscanf(sample,"%f",&matrix[i][j]);
   }
 fscanf(sample,"\n",&matrix[i][j]);
}
fclose(sample);

Sadly the code does not work .. If I have this matrix :

5.00 4.00 5.00 6.00 
5.00 4.00 3.00 25.00 
5.00 3.00 4.00 23.00 
5.00 2.00 352.00 6.00

And inputting 3 for row and 3 for column, I get :

5.00 4.00 5.00
6.00 5.00 4.00
3.00 25.00 5.00

Not only this isnt a 2 by 2 submatrix, but even if I wanted the first 3 rows and first 3 columns, its not printing it correctly....

I need to start at row 3 and col 3, then take the 2 by 2 submatrix !

I should have ended up with :

4.00 23.00 
352.00 6.00

I heard that I can use fgets and sscanf to accomplish this. Here is my trial code :

fgets(garbage,1,fin);
sscanf(garbage,"\n");

But this doesnt work either :(

What am I doing wrong ?

Please help. Thanks !