How can I dynamically assign/access elements in a matrix with arbitrary dimensions?

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Erling Hugo Jensen 2013-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/58825-how-can-i-dynamically-assign-access-elements-in-a-matrix-with-arbitrary-dimensions

编辑： Walter Roberson 2016-6-24

I am creating a code to manipulate a matrix generated from an external file. I would like to make it so that the matrix could have arbitrary dimensions, e.g. in one file it might be just one dimension so listing all the elements could be done like:

A(:)

in another, it might have two dimensions, so listing the elements could be done like:

A(:,:)

if three,

A(:,:,:)

and so on. My problem is that I don’t know how (or maybe it is not possible) to make some general code to manipulate the matrix A. If I had know that A had dimension 3, I could just do something like

A(n,m,o)

But what I would like to do is something like

A(C)

where C is a list equal to [n m o] or [n m o … z].

Any ideas?

~Jensen~

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回答（1 个）

Jan 2013-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/58825-how-can-i-dynamically-assign-access-elements-in-a-matrix-with-arbitrary-dimensions#answer_71184

编辑：Jan 2014-7-15

在 MATLAB Online 中打开

Not matching the question exactly, but worth to mention:

A = rand(2,3,4)   % Or: rand(2,3,4,5,4,3,2)
Index    = cell(1, ndims(A));
Index(:) = {':'};  % BUGFIX: was {:}, thanks Walter and Jim
A(Index{:})        % Equivalent to: A(:, :, :)
Index{2} = 2:3;
A(Index{:});