A perfect number occurs whent the sum of all divisors of a positive integer, except the number itself, equals the number.
28 = 1 + 2 + 4 + 7 + 14;
so return true
10 ~= 1 + 2 + 5
so return false
Extract leading non-zero digit
Matrix indexing with two vectors of indices
Getting the indices from a vector
How many monitors are connected ?
Find the regional maximum value
Find the maximum two numbers of every column of a matrix
Repeat copies of array elements
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Make an anonymous function that has variable output
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