I read a large text file full of GPS data and divided the string up by the using xc=textscan(scol{k,1}, '%s', 'Delimiter',','). Its in a for look and it scans sentences that look like this: $GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*3C
Anyway, one of the points in this cell(scol{1,1}{18,1}) looks like this 2.1*3C but for my project I only need the numbers before the *. I have no idea how to get it or how I could have written my code differently.