Indexed Assignment on the Right Side

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.

Answer 1

[Walter Roberson]

columnTen = struct('fx', rand(7,20)).fx(:,10)         %needs R2019b or later IIRC

columnTen = 7×1

0.9090 0.8635 0.0364 0.2788 0.2503 0.1882 0.7757

●

columnTen = subsref(rand(7,20), substruct('()', {':', 10}))

columnTen = 7×1

0.3391 0.0112 0.5269 0.0961 0.5855 0.0371 0.4590

●

But if you are permitted an initialization beforehand:

Col = @(M,n) M(:,n);     %once

ColumnTen = Col(rand(7,20), 10)

[Sinan Islam]

Verbose but working. I hope MATLAB make it as simple as other languages. Thank you!

Answer 2

[Andrei Bobrov]

Y = f(x);
columnTen =  Y(:,10);

[Sinan Islam]

That is two steps. I need to make the assignment on the fly, in just one line (one operation). I am working with characters. I dont have the option to work on multiple lines (multiple operations). But thanks anyway!