Given two input arrays like this:
Output a string that contains each letter the specified number of times, e.g.:
If given an invalid input (for example, a negative number), output the string 'ERROR'.
Now with improved tests, and reference solution (which I'm sure you can beat).
Make a checkerboard matrix
Replace NaNs with the number that appears to its left in the row.
Column norms of a matrix
kmph to mps
"Look and say" sequence
Create a recurrence matrix for a vector of data
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