Back to basics 25 - Valid variable names
Flip the main diagonal of a matrix
Multiply by 3
Matrix of almost all zeros, except for main diagonal
Variance computation (★)
Create times-tables (★★★)
Generate a vector which contains a pyramid pattern (★★★★)
Create a vector of the first n odd numbers (★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
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