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

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Abdulatif Alabdulatif 2014-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/160005-how-can-pick-a-specific-values-rows-columns-from-a-matrix

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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Answer 1

Nick 2014-10-25

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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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Answer 2

Nani Venky 2021-4-14

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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.