VB.net: Multiplying matrices using arrays.....

BangBeater

Ok, I was just being lazy by trying to get the full answer to my assignment by asking for the full answer!! But, now i've a more specific problem for this assignment.

How exactly do you multiply 2 (3 by 3) matrices together using arrays in VB.net? There is surely a shorter way of doing it than simply typing out the full formula for multiplying two 3*3 matrices i.e. array(1,2)*array(1,1), etc.

Thanks!

stevenmu

I can't remember how matrices are multiplied together but I'm thinking that to code it you need to be using nested for loops e.g.

FOR x = 1 TO 3
   FOR y = 1 TO 3
      'Do something with x and y here
   LOOP
LOOP

BangBeater

thanks. I'm trying something like that at the moment, bt havn't got it working yet.

FunBobby

I'm not sure if this is exactly what you want, but if its not please reply:

If you have two (3,3) matrices (or two-dimensional arrays) called A and B,
to multiply each cell in Matrix A by its corresponding cell in Matrix B, to produce a resultset Matrix C :


For x = 0 to 2 ' Loop (along the columns)

For y = 0 to 2 ' Loop (within each column along the rows)

C(x,y) = A(x,y) * B(x,y)
Print "C" & x & y & "=" C(x,y)

Next y

Next x

(Assumes your matrix is zero based)