I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
The Hitchhiker's Guide to MATLAB
Construct an index vector from two input vectors in vectorized fashion
01 - Scalar variables
Create a two dimensional zero matrix
Unique values without using UNIQUE function
Number of bytes required to store a sparse matrix
Multiply 2 numbers
Return unique values without sorting
Remove the two elements next to NaN value
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