Return a function handle that when applied to an input, it produces two outputs: the first is the same as the input, and the second is the element-wise square of the input.
Example:
f=f2f(); [a b]=f([1 2 3])
a = 1 2 3
b = 1 4 9
What is Function-name? is it f2f or f?
how does this work?
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Find the sum of the elements in the "second" diagonal
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