Add only the odd numbers of x
x = [1 2 3 4 5]
the positive numbers are: 1 3 5, so their sum is 9
Project Euler: Problem 6, Natural numbers, squares and sums.
How to subtract?
Multiply a column by a row
Check if number exists in vector
Given a 4x4 matrix, swap the two middle columns
Reduce the logic
Count the numbers
X plus binary inverted x
i forgot to use capital I
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