The test suite should include a two element input also, for the sake of completion!
Why are several y_correct vectors not column vector as required by the problem?
The leading solution without the regexp hack: 19.
Finding Perfect Squares
Back to basics 9 - Indexed References
matrix of natural number
Create an n-by-n null matrix and fill with ones certain positions
Check that number is whole number
Cell Source Index
Matrix indexing with two vectors of indices
Create a patchwork matrix
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