Indexed Assignment on the Right Side
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Sinan Islam
on 17 Nov 2020
Commented: Sinan Islam
on 18 Nov 2020
I am calling function f(x) that returns a matrix of 100 columns.
All what I need is just the 10th column. So I need one vector from the whole returned matrix.
I need to get rid of 99 columns and retain only the 10th column.
In Julia, this can be done by:
columnTen = f(x)[:,10]
I am dying to do the same thing in MATLAB.
Not sure why this simple operation seems impossible.
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Accepted Answer
Walter Roberson
on 17 Nov 2020
columnTen = struct('fx', rand(7,20)).fx(:,10) %needs R2019b or later IIRC
columnTen = subsref(rand(7,20), substruct('()', {':', 10}))
But if you are permitted an initialization beforehand:
Col = @(M,n) M(:,n); %once
ColumnTen = Col(rand(7,20), 10)
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