The test suite already spoils the solution.
True. In general that should be avoided, although admittedly it's difficult here because if the correct answer were hard-coded, then changes to: (i) the hardware on which Cody runs; or (ii) the version of MATLAB that Cody employs may eventually invalidate it. Having said that, the Test Suite could still be tightened up (see e.g. Solution 1461085).
All your base are belong to us
Triangle Numbers Below N
Matrix indexing with two vectors of indices
Create matrix of replicated elements
The sum of the numbers in the vector
Back to basics 13 - Input variables
Back to basics 20 - singleton dimensions
Back to basics 1 - Saving
Back to basics 19 - character types
Back to basics 24 - Symbolic variables
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