assigning array to another

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Hello Matlab
Hello Matlab 2015-4-3
评论： Hello Matlab 2015-4-3
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?
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James Tursa
James Tursa 2015-4-3
Where in B do you want these values of A to be assigned?
Hello Matlab
Hello Matlab 2015-4-3
编辑：Hello Matlab 2015-4-3
The 1st through the 9th rows also

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James Tursa
James Tursa 2015-4-3
编辑：James Tursa 2015-4-3
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
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Hello Matlab
Hello Matlab 2015-4-3
Thanks so much. Now I get it, I was assigning only the rows, and forgot to put for columns (:).

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