Inserting a constant array in between each of the coloumns

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Harold Kumar
Harold Kumar 2013-12-4
评论： Roger Stafford 2013-12-4
Hi All,
Looking for a help on simple problem (New to Matlab)
Question:
I have an (M * N) matrix; now, I want to insert a constant array {1 * N} (say all 1's) in between each of the N columns.
Is there an easy way to do that.
Help is much appreciated.
Thanks a lot.

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回答（1 个）

Roger Stafford
Roger Stafford 2013-12-4
You can't place a 1 x N row vector between columns - it wouldn't fit. So I assume you really mean place it between rows. If that is what you mean, do this. Let the M x N matrix be A and the 1 x N array be B.
A(1:2:2*M-1,:) = A;
A(2:2:2*M-2,:) = repmat(B,M-1,1);
If by any chance you really want to place something between the columns, you would need an N x M matrix and an N x 1 constant array, that is, a column vector, and you would have to reverse the columns and rows in the above code.
  2 个评论
Harold Kumar
Harold Kumar 2013-12-4
编辑：Harold Kumar 2013-12-4
Hi Roger,
Thanks for responding.
Not to worry. I managed to figure it out.
Here is the answer
----------
If you don't mind creating a temporary matrix, one way to do it would be to do the following:
old_matrix = rand(M,N); % Just for example
new_matrix = ones(M,2*N-1);
new_matrix(:,1:2:end) = old_matrix;
Note that for an arbitrary constant matrix, you could replace the second line with the following:
new_matrix = repmat(const_array,1,2*N-1);
Roger Stafford
Roger Stafford 2013-12-4
You originally asserted that your constant array was 1 x N which is a row vector. I'm glad you changed to an M x 1 column vector here, which would indeed fit between columns.

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