For a given input n, make an n by n identity matrix that contains the elements 1:n along its diagonal. For example, if input=5:
output = [1 0 0 0 0;
0 2 0 0 0;
0 0 3 0 0;
0 0 0 4 0;
0 0 0 0 5]
This problem's title and description were cleaned up and additional test cases were added.
Determine if a Given Number is a Triangle Number
Reindex a vector
Determine the number of odd integers in a vector
Create incrementing array
Sum the rows
Replace all odd numbers with NaN
find the 'M'
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