matrix dividing

If I have a big matrix like this: A=ones(1,450000). How can I divide it in 300 equal parts (1, 1500) and multiple these 300 parts (arrays) with a matrix with dimensions B=(1,300)?

Thank you...

Answer 1

[Fangjun Jiang]

A=ones(1,450000);
NewA=reshape(A,300,[]);
C=B*NewA;

[athpapa -]

with the reshape that you told me, I want now to multiple the first column of array B with the first only line of array NewA, and so on...the 2nd column of array B with the 2nd only line of NewA. Do you know how can I do this??

Thankssssss

[Fangjun Jiang]

Use this example to understand the row and column

Assume B=magic(3)

B(:,1) is the first column of B, B(:,2) is the second column,...

B(1,:) is the first row of B, B(2,:) is the second row, ...