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.
Similar Triangles - find the height of the tree
Back to basics 9 - Indexed References
Sum of first n terms of a harmonic progression
Generate a NaN...on purpose
Big numbers, least significant digits
Big numbers, repeated least significant digits
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