C/C++ :: Matrix Multiplication Using Files

Dec 12, 2014

I am trying to read two matrices from individual .txt file, and later trying to multiply them. But I am unable to succeed.

Here is the code.

#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
// Here starts the main
int main()
{ // The two input values
FILE *inputFile1;
FILE *inputFile2;

[Code] .....

I am able to get only the first values as the output. The first matrix is 5x3, and the second one is a 3x3 matrix.

Matrix 1
1 2 3
4 5 6
7 8 9
10 11 12

Matrix 2
1 2 3
4 5 6
7 8 9

The output which I am getting is

Enter File name of matrix #1 - with extention - : matrix1.txt
Enter File name of matrix #2 - with extention - : matrix2.txt
Rows1 = 1 Cols1 = 2
Rows2 = 1
Cols2 = 2Cant multiply those two matrices

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Code:
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Code:
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ENTER a MATRIX ELEMENTS

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[Code] ....

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I have Problem with matrix vector multiplication in program..

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// y[i*n] = 0.0;
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Oct 31, 2014

I am writing a brute force implementation of matrix multiplication:

Header file:

vector<vector<int> > matrix_multiplication(vector <vector<int> >& a, vector <vector<int> >& B)/>/>/>;

Source file:

vector<vector<int> > matrix_multiplication(vector <vector<int> >& a, vector <vector<int> >& B)/>/>/>{
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[Code] ....

I keep on getting occasional seg faults />/>. I can't see why.

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for (i=0; i< 3; i++)
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Code:
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");
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for(i=0;i<size;i++) {
for(j=0;j<size;j++) {
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Oct 1, 2014

I've been trying to get my matrix multiplication program to run a few different ways. My assignments wants me to run it statically using chunks, but we're not supposed to use OpenMPs scheduler. So I'm not sure how that's possible. And secondly, we have to run it dynamically using locks/unlocks.

Static (not sure how to implement chunk)

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[Code]....

The code will run for a long time too. It uses as many threads as we tell it to but it never speeds up the results.

Quote
Thread 2 doing matrix mult
Thread 4 doing matrix mult
Thread 2 doing matrix mult
Thread 4 doing matrix mult
Thread 2 doing matrix mult
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Thread 4 doing matrix mult
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So here is my horrible attempt at it:

Code:

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[Code] .....

And these are the compile errors...

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detail::expression_type_check (m, cm)
terminate called after throwing an instance of 'boost::numeric::ublas::external_logic'
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covert this in the given form
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2 0 0
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