I would like to 'convert' a 1D array to a 2D matrix considering the value inside the array as: A = 1 3 4 4 3 B = 0 0 0 0 0 0 0 1 1 0 0 1 0 0 1 0 0 0 0 0 1 0 0 0 0 Can you suggest a very fast way to do that? The row number is fixed at 5 here (a known value).

1D array to 2D array positions

2019 4 30

1 个回答

2 次查看（30 天）

0 个投票

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

A =
   3     4     4     3
B =
   0     0     0     0
   0     1     1     0
   1     0     0     1
   0     0     0     0
   0     0     0     0

Can you suggest a very fast way to do that?

The row number is fixed at 5 here (a known value).

James Tursa 2019-4-30

编辑：James Tursa 2019-4-30

1 个投票

n = 5;
B = zeros(n,size(A,2));
B(sub2ind(size(B),n+1-A,1:size(A,2))) = 1;

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