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 9 - Indexed References
Make a random, non-repeating vector.
Return the first and last character of a string
Find the nearest integer
Add two numbers
Reduce the logic
Count the numbers
Odd times even numbers in a matrix
Add the positive numbers
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