How to replace minimum values with 0 and maximum with 1 in an array

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Vishal Sharma 2017-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/345277-how-to-replace-minimum-values-with-0-and-maximum-with-1-in-an-array

编辑： Jan 2017-6-19

I have an array of

 A = [ 1 4 3 4 3 4 5 6 4 5 6 7; 
       2 3 4 5 3 4 5 6 2 3 4 2]

I want to replace maximum value in sets of four value with ‘1’ and remaining with ‘0’ of each row. So, as to get result as follows:--

 A = [ 0 1 0 0 0 0 0 1 0 0 0 1; 
       0 0 0 1 0 0 0 1 0 0 1 0]

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Answer 1

Guillaume 2017-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/345277-how-to-replace-minimum-values-with-0-and-maximum-with-1-in-an-array#answer_271113

编辑：Guillaume 2017-6-19

在 MATLAB Online 中打开

What you didn't say is that your set of four values is by row. Matlab works by column. You'll make your life much easier if you work the same way as matlab. In this particular case, it would be even easier if you stored your array in columns of 4 rows.

A = [ 1 4 3 4 3 4 5 6 4 5 6 7; 2 3 4 5 3 4 5 6 2 3 4 2]
[~, maxloc] = max(reshape(A', 4, []));  %transpose to work by column instead of row
maxloc = sub2ind([4, numel(maxloc)], maxloc, 1:numel(maxloc));
A = zeros(size(A'));
A(maxloc) = 1;
A = A'   %transpose back

Much of the work above is just to get the array in the correct shape and back to the shape you have.