I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Select every other element of a vector
The Hitchhiker's Guide to MATLAB
Back to basics 22 - Rotate a matrix
Rotate input square matrix 90 degrees CCW without rot90
Convert a Cell Array into an Array
THE CALCULATOR OF LOVE
Next Higher Power of B
Return the first and last character of a string
Return the 'Size' of a String of Code
Set a Soroban Abacus
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