perhaps you should specify that y is in the order of the first occurence of each unique element of x
This would be a better problem if unique and sort functions were not allowed
Solution without using sort(.) or unique(.) .
Solution without using sort(_) or unique(_) .
Note 1) this solution does not use sort() anywhere :) 2) the more elegant "stable" is not available for unique in pre-2012 MATLAB.
Determine if a Given Number is a Triangle Number
03 - Matrix Variables 1
Matlab Basics - Rounding I
Sort an array of structures
Number of bytes required to store a sparse matrix
Wind outward from the center ...
Get the elements of diagonal and antidiagonal for any m-by-n matrix
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