Given a ColorSpec string, either in short or long form, return the corresponding RGB triplet. If the input is not a valid color, return an empty vector.
str2rgb('red') returns [1 0 0]
str2rgb('k') returns [0 0 0]
str2rgb('pizza') returns 
When I see beautiful and efficient Ly Cao solutions, I have the feeling that Cody has found another master (after Alfonso).
Thank you. I'm flattered. I still have a lot to learn.
Make a checkerboard matrix
Select every other element of a vector
Omit columns averages from a matrix
Check if number exists in vector
Cumulative minimum of an array
Check if vertices form a rectangle
Create cell array of numeric arrays
Repeat middle rows and columns of an array
Maximum of each diagonal
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