You're *very* close with this one. Remember that r is input as a double, not a string.
Omit columns averages from a matrix
Matrix indexing with two vectors of indices
Make a random, non-repeating vector.
Make a run-length companion vector
Golomb's self-describing sequence (based on Euler 341)
High Precision Square Root (Inspired by Project Euler 80)
Sums of Multiple Pairs of Triangular Numbers
With apologies to William Blake
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