Taking input data from multiple files

2014 9 23
1 个回答
更新时间：2014 9 25
1 次查看（30 天）

0 个投票

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

请先登录，再回答此问题。

回答（1 个）

Michael Haderlein
Michael Haderlein 2014-9-23

0 个投票

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

6 个评论
显示 4更早的评论 隐藏 4更早的评论

Bhaskar
Bhaskar 2014-9-23
编辑：Bhaskar 2014-9-23
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
Michael Haderlein 2014-9-23
编辑：Michael Haderlein 2014-9-23
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
Bhaskar 2014-9-24
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
Michael Haderlein 2014-9-24
If you open the file via
fid=fopen(fullNameWithPath)
what value does fid have?
Bhaskar
Bhaskar 2014-9-24
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
Michael Haderlein 2014-9-25
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.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Workspace Variables and MAT Files 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by