I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Distance walked 3D
Sorted highest to lowest?
Compute a dot product of two vectors x and y
Getting logical indexes
Create a two dimensional zero matrix
Convert a structure into a string
Assign numerical values to a structure with 1 field
Unique values without using UNIQUE function
Number of bytes required to store a sparse matrix
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