Remove the polynomials that have positive real elements of their roots.
Return the first and last character of a string
Times 3 problem
MATLAB Basic: rounding II
Solve a System of Linear Equations
Get the area codes from a list of phone numbers
Find the numeric mean of the prime numbers in a matrix.
Sort a list of complex numbers based on far they are from the origin.
Find all elements less than 0 or greater than 10 and replace them with NaN
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