Additional test cases have been added.
nice internal reference to the match.
a simple improvement could be to parse "s" as input and write "lower($0(2:..." in the replacement string.
two steps in one op, nicely done!
Multiply a column by a row
Duplicate each element of a vector.
Generate N equally spaced intervals between -L and L
multiply by three
Is it column vector?
Sum of Two Numbers
Find the average of a random sequance
Add a vector to a matrix
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