How can pick a specific values (rows,columns) from a matrix?

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Hi all,
I want to process a part of large a matrix. Let's assume we have a matrix with 10 rows and 10 columns, I want to pick a small matrix from it with 4 rows and 5 columns. How can I do it?
Thank you

Accepted Answer

Nick
Nick on 25 Oct 2014
if a = rand(10,10)
if you want 4 rows and 5 columns you can do a([1:4],[1:5]) and it will give you the first 4 rows and 5 columns. a([4:7],[5:9]) will give you rows 4-7 and columns 5-9 etc.

More Answers (1)

Nani Venky
Nani Venky on 14 Apr 2021
Previous answers are applicable if you want to select consecutive rows or columns.The below way can be used to select elements from any row and column.
Example:
A = randi(10,6,6);
B = A([1:2 4:end],[1:2 5:end]);
This way you can form a matrix B that contains the element in A except from third row and third and fourth columns.

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