please explain the solution.
The ~ is a dummy variable, and isn't needed for the calculation. Some earlier versions of MATLAB don't have that option, and will give you an error with that statement. If you have that happen, you can use dummy or junk as the variable name in place of the ~.
I'm late, but James answer ist perfect! ;-)
Back to basics 15 - Benchmark
Specific Element Count
Calculate the derivative of a polynomial
Find the position of last minimum value in an integer array with numbers
Find nth maximum
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