Copying index positions to other matrices

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Zaharaddeen Hussaini 2019-5-16

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评论： madhan ravi 2019-5-16

Hi, I am trying to equate the index postion of a matrix onto other matrices. This what I did and the results do not seem to be correct

A = rand(10,10);                 % First Random Matrix
A2 = rand(10,10);                % Second Random  Matrix
M = mean2(A);                    %Mean Value of A
B = A;                           %Copy 
B(B<M) = NaN;
[row, col] = find(isnan(B));     %NaN Index Position of B
B2 = A2; 
B2([row, col])=NaN              %Copy of NaN Index Position onto array B2

Now unfortuntely it does not seem to transfer the index position of B onto array B2.

Thanks

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采纳的回答

madhan ravi 2019-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/462381-copying-index-positions-to-other-matrices#answer_375258

编辑：madhan ravi 2019-5-16

在 MATLAB Online 中打开

B2(sub2ind(size(B),row,column))=NaN

Why not directly use logical indexing from isnan() ?

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Jan 2019-5-16

在 MATLAB Online 中打开

This means:

mask = (B < M);
B(mask) = NaN;
B2 = A2; 
B2(isnan(B)) = NaN; 

madhan ravi 2019-5-16

@Jan: Bedank' mich :)

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MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices

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