matlab 科学计数法问题

Question

I have an issue where an 8-digit string such as '313397E9' is being passed into excel, then read as the number '313397000000000', or '3.133970e+014'.

This is then being read by Matlab and recognized as the number, not the string. What would be the easiest way to convert it back to the 8-digit string?

Thanks in advance for all your help.

Answer 1

Regular expressions to the rescue! You can use REGEXPREP to convert the trailing zeros into Ex, where x is the number of zeros you just replaced.

%# convert the number to a string
nn = num2str(3.133970e+014)

nn =
313397000000000

%# replace zeros using regexprep
regexprep(nn,'([0]*)','E${num2str(length($1))}')
ans =
313397E9

This also works if nn is a cell array of strings, btw, so you can convert your list of numbers in one go.