I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Number of 1s in the Binary Representation of a Number
The Hitchhiker's Guide to MATLAB
Given a window, how many subsets of a vector sum positive
Output any real number that is neither positive nor negative
MATLAB Basic: rounding III
N-Dimensional Array Slice
Check to see if a Sudoku Puzzle is Solved
Project Euler: Problem 16, Sums of Digits of Powers of Two
Next Higher Power of B
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