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How to index all columns but one in a matrix?

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Peter
Peter 2013-8-2
评论： James Tursa 2018-8-3
Hi!
I want to do index/use all columns in a matrix but a single one, so for example:
A=[1 2 3 4; 1 2 3 4; 1 2 3 4] and I 'd like to get at B=[1 2 4; 1 2 4; 1 2 4].
A long way to that would be: B=[A(:,1:2),A(:,4)], but is there anything faster/built in?
Best Peter

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James Tursa
James Tursa 2013-8-2
B = A;
B(:,3) = [];
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James Tursa
James Tursa 2018-8-3
Because [1 1 0 1] is not a logical vector and you are not accounting for both dimensions. E.g., compare your code to this:
X(:,logical([1 1 0 1]))

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David Sanchez
David Sanchez 2013-8-2
% no need of a new matrix, remake the old one:
A = exp(A(:,[1:2,4]));

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