Convert the input to a cell array, but only if necessary.
If the input is a numeric array, return a 1-by-1 cell array containing the input. If the input is a cell array of numeric arrays, return the input unaltered.
Getting the indices from a matrice
Generate a NaN...on purpose
Add two numbers
03 - Matrix Variables 1
Assign matrix rows/columns to separate variables
Create an 8-color version of an image
Find mistyped words in text (mixed-up letters)
Repeat middle rows and columns of an array
Numeric array to cell array of strings (easy)
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