HOW TO REPLACE SPECIFIC ELEMENTS IN A MATRICE?

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Muhammad Safwan Khan
编辑： Jan 2022-4-23
Consider a 5x5 matrix A
How to replace the numbers on the locations (2:3,3) and (4,3:5) with zeros.
Help needed !!

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Jan
Jan 2022-4-23
编辑：Jan 2022-4-23
A = rand(5, 5);
A(2:3, 3) = 0;
A(4, 3:5) = 0;
Is this a homework question? If so: what a pity that you did not try it by your own. You see, that the translation from English to Matlab is not hard in this case.
Can you find an alternative using logical indexing, which inserts the zeros in one command?
  2 个评论
Muhammad Safwan Khan
Muhammad Safwan Khan 2022-4-23
THANKS FOR HELPING
I'm Beginner & it is my first experience of practicing matlab.I didn't know much about it but hope gradually i will ace it..
Jan
Jan 2022-4-23
编辑：Jan 2022-4-23
Do you know Matlab's onramp tutorial already? https://www.mathworks.com/learn/tutorials/matlab-onramp.html
The "Getting Started" chapters of the documentations are useful also.
With "logical indexing" (index using a logical mask):
A([0,0,0,0,0; ...
0,0,1,0,0; ...
0,0,1,0,0; ...
0,0,1,1,1; ...
0,0,0,0,0] == 1) = 0
With "linear indexing":
A([12, 13, 14, 19, 24]) = 0;
Here the elements are treated as A is a 1D vector.

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