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.
The Goldbach Conjecture, Part 2
Sum of diagonal of a square matrix
Rotate a Matrix
Convert Two Character String into a Binary Vector
Big numbers, least significant digits
Generate a NaN...on purpose
Big numbers, repeated least significant digits
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