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How to manipulate expressions structurally, not necessarily complying with the rules of algebra.

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I cannot understand the difference between Apply, Scan, and Map. I have tried to play with these functions using the codes below: f[x_] := x^2 Map[f, {{a, b}, c}] Output: {{a^2, b^2}, c^2} …
asked Apr 16 '14 by MOON