## arcticf0x 3 years ago Matrix Multiplication C++

1. arcticf0x

There seems to be some logical error here, and i am not able to really understand the following part. Code: http://ideone.com/wgZ3J And the part followed by //mult there.

2. nczempin

the page you linked shows up empty for me; on Firefox

3. farmdawgnation

Ditto to the above comment.

4. arcticf0x

5. agdgdgdgwngo

http://ideone.com/mQNtH lets have a look at before the entire "mult" block...

6. agdgdgdgwngo

http://ideone.com/si08f there now it's better. Instead of the cin >> m >> n; I used cin >> m; and the n = m; same for the o and p. Let's uncomment that mult block. http://ideone.com/EYFhR everything seems fine now.

7. arcticf0x

Yes but that would just multiply sqare matrices. I want it for normal multiplication, and want to know exactly what happens (inside) with those three loops.

8. arcticf0x

But thanks for alteast caring about it @agdgdgdgwngo btw, in void print_matrix(int m[10][10], int s) what is int s for?

9. agdgdgdgwngo

Ahh I thought you only needed square matrices :-P the s in the print_matrix procedure specifies the size of the square matrix. I've now modified the print_matrix procedure so it works on row and column dimensions. http://ideone.com/ktBnc the first and second loops in main() just fill up the first and second matrices with input from cin the last loop does the dot product of two matrices

10. arcticf0x

Wow! Its on a roll now! Sorry to trouble you so much, one last thing, what is the role of m and o in print_matrix(mult, m, o); if its for size as before, then shouldnt it be m,p? And for "for(int k=0;k<n;k++)" am i correct in saying, that the previous loops assign the locations of rows and colums (m and p respectively) and this one multiplies the their values? If that is what you mean by dot product.

11. agdgdgdgwngo

Right; it should be print_matrix(mult, m, p); my bad :-P Right about the for loop as well: that particular one one is computing the matrix product.

12. arcticf0x

Thank you very much!