1D array values to 2D matrix

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Eduardo Santos 2019-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/455188-1d-array-values-to-2d-matrix

评论： Eduardo Santos 2021-1-4

采纳的回答： Adam Danz

在 MATLAB Online 中打开

I would like to 'convert' a 1D array to a 2D matrix considering the value inside the array as:

A =
   3     5     4     3
B =
   3     5     4     3
   3     5     4     3
   3     5     4     3
   0     5     4     0
   0     5     0     0

Can you suggest a fast way to do that?

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采纳的回答

Adam Danz 2019-4-8

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A for-loop would make a cleaner read (I could provide that upon request) but here's two lines the do the trick.

base = cellfun(@(x)repmat(x,x,1), num2cell(A), 'UniformOutput', false);
cell2mat(cellfun(@(y,n) padarray(y,n, 'post'),base, num2cell(max(A)-A), 'UniformOutput', false))

ans =
   3     5     4     3
   3     5     4     3
   3     5     4     3
   0     5     4     0
   0     5     0     0

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Adam Danz 2020-12-27

在 MATLAB Online 中打开

A = [1,3,5,4,3]
A = 1×5
     1     3     5     4     3
B = zeros(max(A),numel(A));
for i = 1:numel(A)
    B(1:A(i),i) = 1:A(i);
end
disp(B)
     1     1     1     1     1
     0     2     2     2     2
     0     3     3     3     3
     0     0     4     4     0
     0     0     5     0     0