how to remove columns from a 3D array, considering user input

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I have a 3D matrix A, with dimensions 50*1000*30. I would like to remove some columns of the 30 I have (3rd dimension). The columns that I would like to have removed should be defined by user input, separated by commas. An example of an acceptable input is 1,5,7,9
for the removal of the columns 1, 5, 7 and 9 of all of the 50 tables. I know the input can be coded in something like this:
columns= input('Please write the number of the columns to be removed, separated by commas')
However, I don't know how I can obtain a new matrix, let's call it B, with the columns stated as input (variable columns) removed.
Any suggestions on how to do this?
I thank you in advance,
Best regards,

Accepted Answer

Jan on 25 Feb 2022
Edited: Jan on 25 Feb 2022
Either use square brackets for the input:
b = input('Indices enclosed in square brackets: ');
% Type in: [1,5,7]
Or input a string and convert it manually:
s = input('Indices, comma separated: ', 's');
s = strrep(s, ',', ' ');
b = sscanf(s, '%d');
% b = [1,5,7]
A = rand(50, 1000, 30);
A(:, :, b) = [];
% Or do you mean the 1st dimension?
% A(b, :, :) = [];

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