I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Renaming a field in a structure array
Filter AC, pass DC
Create a cell array out of a struct
Getting logical indexes
Check if number exists in vector
Create a matrix from a cell
Multiply 2 numbers
Return unique values without sorting
Create a vector whose elements depend on the previous element
Sort an array of structures
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