Error using textscan Invalid file identifier. Use fopen to generate a valid file identifier

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Laura
Laura 2014-2-17
编辑： Mischa Kim 2014-2-17
if true
% code
end
[head,nw,wv,spec]=ReadOOIfile('/Users/elkel/Active','D02e1.txt')
% [head,nw,wv,lt]=ReadOOIfile(dirn,filename);
% read, smooth, cut to 300-700nm every 2nm, for OOI USB2000+ output spectra
% DATA: dirn : scan file directory, such as 'C:\Scans\'
% fname: scan file name
% OUTPUT:
% head: file name, 'date & time', integ. time, n averaged, boxcar
% nw: points in scan wv = wavelengths spec = spectrum output
wv=(300:1:700)'; n=length(wv);
fnm=[D02e1.txt];
fid=fopen(fnm);
rd=textscan(fid,'%s',17,'whitespace','\n'); heads=rd{1};
% heads contains first 17 rows of file--OOI scan parameters
% extract=date, integration time, averaged, boxcar
rd=textscan(fid,'%f %f');
fclose(fid);
Hi, I'm trying to figure out why I get the above error code when using textscan. I think it's something to do with my specification of the filename (fnm) but I can't seem to get it to work - how should the filename be specified? Directories all seem fine so any help much appreciated.

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回答（1 个）

Mischa Kim
Mischa Kim 2014-2-17
编辑：Mischa Kim 2014-2-17
Laura, use
fnm = 'D02e1.txt';
fid = fopen(fnm,'r');
The filename needs to be a string of characters.
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Mischa Kim
Mischa Kim 2014-2-17
编辑：Mischa Kim 2014-2-17
There are a couple of things:
  • Change the function definition to [head,nw,wv,spec]=ReadOOIfile() and remove the semi-colon. You could read the file name as a parameter, but then you would use [head,nw,wv,spec]=ReadOOIfile(fnm), and without hardcoding it inside the function.
  • Replace fname by fnm in head=[fnm ' ''' datestr ''' ' IT ' ' AV ' ' BX]
  • Comment out the two clear commands. In one instance you are clearing a variable which you later try to access.
Once you get all this changed it'll work.

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