MATLAB: Strfind issue

strfind

Hi,
I have a filename (including whole path) as a string with directories separated by / e.g. root/folder/file.
I am using strfind to find the slashes as follows and to give an index array of the position of the / symbols, :
      % Find all occurances of the string '/'
      [no_slash] = strfind ( line, '/' );
and then trying to extract the filename as a string as follows:
      % Extract the case number:
      caseNo = ( [no_slash(3)+1 : no_slash(3)+4] );
I get NaN returned and I don't know why! If anyone has an idea or an alternative method then it would be much appreciated!!
Thanks,
Robbie

Best Answer

As Daniel says, there must be more going on. Can you copy the code directly? strfind returns the indices; if there are no matches, it returns []. Hence, if line was 'root/folder/file', strfind(line,'/') returns [5,12].
So in this case you'd get an indexing (out of bounds) error on the next line. If there was three slashes in the string, you'd get a vector like [13, 14, 15, 16].
Are you perhaps trying to extract a portion of the string and str2num it? In which case, you want
caseNo = str2double(line(no_slash(3)+1 : no_slash(3)+4))
(Note: if you leave out the line in the above command, you get NaN. Or if line isn't a string.)
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