The colon notation used in multidimensional array
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I have come across the following notation in MATLAB
y(:, :, :, 2) = y(:, :, :, 1);
y(:, 1, :, 4) = y(:, 1, :, 3);
I have no clue what it means?
I know for matrix A(:,1) and A(1,:) means extract first column and first row respectively. But the above is not clear to me.
Thanks.
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Accepted Answer
Adam
on 28 Apr 2015
It is just an extension of what you already know, but for multi-dimensional arrays. You can no longer use terms like 'rows' and 'columns' unless you have n ever more creative names for each dimension, but the logic is the same. Take all data from the dimensions that have a : and only the specified data from the dimensions which you give an exact index for.
Personally I rarely if ever use arrays of dimensionality higher than 3 because I like to be able to visualise what indexing means and since I can't visualise beyond a 3d cube I easily get confused. That said, the logic works the same whether it can be visualised intuitively or not!
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