assigning array to another

I'm struggling with the rows index of the matrix.

First I have Matrix A which is 1125 X 30 dimensions. I want to initialize Matrix B as 10 X 30, first as zeros and then matrix B takes the first ninth rows of matrix A, and keep its last rows as zeros. How can I do that?

[James Tursa]

What is "... first ninth rows ..."? The 1st through the 9th? The 1st and 9th only? Every 9th row? Or what?

And where exactly in B do you want these rows of A to appear?

[Hello Matlab]

The 1st through the 9th

[the cyclist]

This is not perfectly clear to me. What is the final size of B?

[Hello Matlab]

B is still 10X30, but I want the values of The 1st through the 9th of A to be assigned to B

[James Tursa]

Where in B do you want these values of A to be assigned?

[Hello Matlab]

The 1st through the 9th rows also

Answer 1

[James Tursa]

Is this what you want?

B = zeros(10,30); % initialize Matrix B as 10 X 30, first as zeros
B(1:9,:) = A(1:9,:); %  B takes the first ninth rows of matrix A

[Hello Matlab]

Thanks so much. Now I get it, I was assigning only the rows, and forgot to put for columns (:).