Given a vector of positive integers
a = [ 3 2 4 ];
create the matrix where the i th column contains the vector 1:a(i) possibly padded
b = [ 1 1 1
2 2 2
3 0 3
0 0 4 ];
Specific Element Count
Symmetry of vector
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Generate a string like abbcccddddeeeee
Return unique values without sorting
Convert a numerical matrix into a cell array of strings
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