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).
Inner product of two vectors
Hackathon: the beginnings
Whether the input is vector?
Multiply a column by a row
Find Index of maximum Value and maximum Value of a vector
Create a recurrence matrix for a vector of data
"Look and say" sequence
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