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It was working fine like this:


boolean compare_matrices(double *matrixC, double *matrixD, int rows, int cols)^M
{
const double EPSILON = 0.0000000001;
int row, col;
boolean flag...

Lookin good now thanks.

I'm trying to compare two matrices to see if they are equal. They are stored in the same manner, in that I use a double pointer.

This is my code


for ( row = 0; row < rows; ++row )
{...

Hey,

Background:
I've built a matrix multiplier in C based on the fortran DGEMM function.
It works great the only remaining modification I need to make is to add OpenMP pragmas so that it can...

Like I said they can be linked fine. It's just with the intel compiler that I can't get it to compile. f77 and g77 work fine
>f77 -o mm mm.c mmult.c dgemm.o xerbla.o lsame.o
compiles just file.

...

Hey,

Ok here goes...
I needed to separate a function (mmult) I had made from the driver program so I put it in its own .c file. The C driver though calls mmult.c and other Fortran functions so i...

Hey - Quick one for ya...

I get the warning message below at compile time because i'm trying to compare a double value to 0.

What should I use to compare it? I'm working on a matrix multiplier...

Excellent. That seems to be working now. I could have sworn that I'd tried that! maybe i didn't save it right or something. thanks Dave you've been a great help.

That makes it easier to read and...

Mmmm....

I modified it to take in the a[m][n] x b[n][p] = c[m][p] sizes.

I've not got it just right, it's close but close is wrong so...


void mmult(size_t m_rows, size_t n_common, size_t...

Yes that's right - i'm comparing my result with the Blas implementation which uses the DGEMM routine as described Here.

Ah-ha. That makes sense to me now.

So i'm gonna have


void...

Ok Dave, Thanks, that seems to work fine.

I was unsure how you got this part:



I went thorugh it step by step and i see what it's doing but i'm not completely sure why that works. Thing is...

Ok - i got a bit confused by that so had to ask my supervisor again...

Swoopy you were on the right track - I need to have a single pointer instead of a double so
would work.

This means that...

Hey,

I'm creating a matrix-matrix multiplier in C that will use the same format as the GOTO BLAS and ATLAS implementations. I need to allocate memory and store the matrices in COL MAJOR format not...

Hey I've got that set up and working fine now by the way. It was a great help it got my program kicked off and have made a good deal of progress so thanks for your help quzah!

Colm.

Ok....

Yeah the 'void main' bit was a typing mistake - i had called the function something else but changed it to main but forgot to change the rest. I was just trying to show a quick example....

Hey thanks,

Ok that helped a bit. I read that an array name is just a pointer to the beginning of the allocated memory space. Does this mean I treat the matrix just as an array?

I know that If...

Hey,
I'm working on an openMP enabled matrix-matrix multiplier that will multiply two matrices, A and B, storing the result in C. I have been told to write it in C, of which I have no experience. ...