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

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Abdulatif Alabdulatif
回答： Nani Venky 2021-4-14
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

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采纳的回答

Nick
Nick 2014-10-25
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.

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Nani Venky
Nani Venky 2021-4-14
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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