Find zeros in a part of a matrix

Question

Konstantinos Tsitsilonis 2017-11-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/369769-find-zeros-in-a-part-of-a-matrix

评论： Konstantinos Tsitsilonis 2017-11-28

采纳的回答： Jos (10584)

在 MATLAB Online 中打开

Hi all,

I have a matrix such that:

 Tarr =
0e+05 *
0006    0.0000    0.0000    0.0000         0
0002         0         0         0         0
0001         0         0         0    0.0001
0004         0         0         0         0
         0    1.3018    1.4506    0.2323    0.0540
0005    0.0000    0.0000         0         0
0002         0         0         0         0
0000         0         0         0         0
0004         0         0         0         0
         0   -2.9018   -3.0506    0.2323    0.0540
0005         0         0         0         0
0002         0         0         0         0
0000         0         0         0         0
0004         0         0         0         0
         0         0         0    0.2323    0.0540

I would like to find the indices of the zero elements in the following subsection of the matrix

Tarr(5:5:end,2:end)

An then replace those with some numbers I desire. I know this must be fairly easy, however I cant seem to be able to find a straightforward way.

KR,

KMT.

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Answer 1

Jos (10584) 2017-11-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/369769-find-zeros-in-a-part-of-a-matrix#answer_293588

在 MATLAB Online 中打开

temp = Tarr(5:5:end,2:end) ;  % get the relevant portion
temp(temp==0) == 12345 ;      % your value
Tarr(5:5:end,2:end) = temp ;  % put the edited portion back in