Taking input data from multiple files

Hey everyone I have multiple files by the name of outputfile0001.txt, outputfile0002.txt ... upto outputfile0060.txt . each file has a structure like this:

1. 0.26630448E-08 0.62768422E+00
2. 0.30589992E-08 0.64235565E+00
3. 0.35138231E-08 0.65737000E+00
4. 0.40362683E-08 0.67273529E+00
5. . .
6. . .and so on.basically two sets of numeric arrays gi(i) and rri(i)are there in these files.Now what i want is to is from each file plot(rri(),gi()).Any help is appreciated.I tried the code below with error that:'error in opening file'

numfiles = 60; mydata = cell(1, numfiles);

for k = 1:numfiles myfilename = sprintf('outputfinal%d.txt', k); mydata{k} = importdata(myfilename); end

Answer 1

[Michael Haderlein]

 myfilename = sprintf('outputfinal%d.txt', k)

will produce e.g.

 outputfinal1.txt

To get the zeros in the filename, use

 myfilename = sprintf('outputfinal%04d.txt',k)

Best regards, Michael

[Bhaskar]

Still getting the error:(hfhfhf ) is name of .m file in the same directory of text files.

Error using importdata (line 137)

Unable to open file.

Error in hfhfhf (line 6)

mydata{k} = importdata(myfilename);

[Michael Haderlein]

Could you please display the content of myfilename by just removing the ";" after the sprintf command? Does it match with the respective file name in your folder?

Also, sometimes single files are missing? Does the error occur at the very first loop iteration or somewhere later? You can enter

 dbstop if error

in the command window to stop the program right before failing. Then, you can easily check the values of k and myfilename.

[Bhaskar]

Yes it occurs in the first loop. I changed the code to this:

if true
  % numfiles = 2;
mydata = cell(1, numfiles);
pathName='D:\Atmospheric and cloud engineering\cloud spectrum data\FINAL RESULTS\A BRAVE NEW WORLD';
for k = 1:numfiles
myfilename = sprintf('r%.4d.txt', k);
fullNameWithPath = fullfile(pathName, myfilename);
mydata{k} = importdata(fullNameWithPath);
end

end

value of fullNameWithPath is :D:\Atmospheric and cloud engineering\cloud spectrum data\FINAL RESULTS\A BRAVE NEW WORLD\r0001.txt

k=1

And the file is actually there. So still clueless about the problem.

[Michael Haderlein]

If you open the file via

 fid=fopen(fullNameWithPath)

what value does fid have?

[Bhaskar]

for fid it shows:

Undefined function or variable 'fid'.

By the way i should mention that i am getting txt files from a fortran 77 program.

[Michael Haderlein]

I mean, if you write the code line I have provided in the previous comment in your loop, before the importdata line. Then fid will have a value. -1 indicates that it cannot find the file, any other value (>2) indicates that the file can be accessed. Instead, you could also write

 dir(fullNameWithPath)

to check if Matlab really finds the file.