Similar to isletter. Returns a vector the same length as the input string but with a true for each character that is a number and false otherwise.
The test here is for the ascii character set, so char(48:57) qualifies.
Ben Barrowes (2021). isnumber (https://www.mathworks.com/matlabcentral/fileexchange/7898-isnumber), MATLAB Central File Exchange. Retrieved .
while a nice pedestriletto, it should be baptized ISDIGIT rather than ISNUMBER. ISNUMBER (traditionally) recognizes string elements that constitute a valid sscanf-able sequence, eg, 1.2e3
as usual, just a thought
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