Can you give us any hints? I tried findobj() but can't make progress!
You are on the right track with findobj(). The trick is what the call to "legend" does to the objects that make the solution very simple.
Encode Roman Numerals
Find the sum of the elements in the "second" diagonal
Back to basics 15 - Benchmark
Switch matrix to a column vector
Big numbers, least significant digits
Big numbers, repeated least significant digits
Generate a NaN...on purpose
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