Tim created another superb solution. The highlights are an elegant center of square's determination using ndgrid. The crux of his method is a convolution for each square not using "same" with an interesting centroid kernel. The comparison between all square convolutions for all rotations utilizes a concise norm metric function. The method should work on non-binary images. The best six matches from the 180x180 upper triangle error array are handily converted into the output format. Thank You Tim for this elegant solution.
Roll the Dice!
Replace all zeros and NaNs in a matrix with the string 'error'
Create incremental spiral WITHOUT USING EVAL or FEVAL
We love vectorized solutions. Problem 1 : remove the row average.
Give me Hamming on five, hold the mayo
Slitherlink I: Trivial
Map all the indices of an Array Indices into a Vector giving Index vs Row and Column
GJam 2017 Kickstart: Vote (Small)
Fix y_correct : Hack
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