test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Distance walked 3D
So many choices
Column norms of a matrix
Min of a Matrix
Find the area of the four walls
Convert a Cell Array into an Array
Convert vector datasets to plot with imagesc instead of scatter
Tony's trick for duplicating an mx1 vector n times
remove nans fast
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