How to eliminate certain columns from a matrix

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Hatake nara
Hatake nara 2019-6-13
回答： Manvi Goel 2019-6-13
If I need to remove any column how do I do it?
For example:
s is a mxn matrix.I need to remove the odd columns i,e, the 1st,3rd.. columns.

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KSSV
KSSV 2019-6-13
编辑：KSSV 2019-6-13
Let A be matrix
A(:,1:2:end) = [] % remove odd columns
A(:,3) = [] % remove third column
idx = [1 2 5 7] ;
A(:,idx) = [] % remove columns specified in idx

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Manvi Goel
Manvi Goel 2019-6-13
Let the matrix be a.
You can remove the odd columns of a matrix by :
a(:,1:2:end) = []
% 1:2:end runs a loop from 1 till the numbe rof columns, increments the index by 2 every time and
% empties the column with that index.
Or use the following command to remove and column with index 'i'
a(:, i) = []

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