How to Delete Diagonal Elements from a Matrix and Reshape It?

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Isa Samad
Isa Samad 2020-11-7
评论： Dominique Mutombo 2023-3-22
Hi all,
I have a matrix M that I would like to remove diagonal entries from and reshape it. For reference, all diagonal elements that I want to remove are 1s and the dimensions of this matrix are N x N (where N can be as large as 90) so I will give an smaller example below:
For some of my data, however, the diagonal entries are occasionally NaN. The diagonal entires thus, will either be 1 or NaN.
Thanks
M = [ 1 4 2 3
5 1 2 3
3 3 NaN 3
4 5 3 1 ]
% Ideal New Matrix after
M2 = [ 5 4 2 3
3 3 2 3
4 5 3 3 ]

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回答（1 个）

David Hill
David Hill 2020-11-7
a=size(M,1);
M(1:a+1:end)=[];
B=reshape(M,a-1,[]);

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