I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find state names that start with the letter N
Knight's Tour Checker
Back to basics 23 - Triangular matrix
Convert a Cell Array into an Array
Given a square and a circle, please decide whether the square covers more area.
THE CALCULATOR OF LOVE
English to Pig Latin Translator
Generate N equally spaced intervals between -L and L
Solve the Sudoku Row
Project Euler: Problem 16, Sums of Digits of Powers of Two
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