All odd numbers in x are added, while all even numers are subtracted from this.
x = [1 2 3 4 5];
y = +(1+3+5)-(2+4) = 3
Back to basics 15 - classes
Maximum value in a matrix
Matlab Basics - Pick out parts of a vector
Matlab Basics - Rounding III
Odd times 3
Magnitude of a vector
Reduce the logic
Second smallest number
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