assigning array to another

2015 4 3
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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
编辑：James Tursa 2015-4-3
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
Hello Matlab 2015-4-3
The 1st through the 9th
the cyclist
the cyclist 2015-4-3
This is not perfectly clear to me. What is the final size of B?
Hello Matlab
Hello Matlab 2015-4-3
B is still 10X30, but I want the values of The 1st through the 9th of A to be assigned to B
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

1 个投票

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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