I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
How to find the position of an element in a vector without using the find function
Convert a numerical matrix into a cell array of strings
Find the nearest integer
Area of an Isoceles Triangle
Extra safe primes
Specific Element Count
Project Euler: Problem 16, Sums of Digits of Powers of Two
Cache me Outside
Clock Hand Angle 1
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