Who invented zero?
The sum of the numbers in the vector
03 - Matrix Variables 6
Create a two dimensional zero matrix
Draw a 'X'!
Sum of terms in a series 1 (★★★)
Factorize uniquely! (★★)
Extract leading non-zero digit (★★★★★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
Sum of elements in a vector (★)
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