Return true if the input is a Smith number in base ten. Otherwise, return false. Read about Smith numbers at http://en.wikipedia.org/wiki/Smith_number.
A Smith number must be positive and have more than one factor.
Reindex a vector
Replace multiples of 5 with NaN
Given a 4x4 matrix, swap the two middle columns
Area of a triangle
Split up vector or matrix delimited by NaNs
Get input and output variable names
Test within tolerance
Remove TeX from string
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