Reading Data from more than 2000 txt files in matlab

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Ahmed 2014-8-19

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关闭： MATLAB Answer Bot 2021-8-20

I have more than 3000 Data txt files. I create the name for these file according to special rate h=[1]; k+=[0.1 0.2 0.4 0.7 1 1.1 1.2 1.5 1.7 2 2.5 3 3.5 4 5]; K-T=[1e-6 0.1 0.2 0.4 0.7 1 1.1 1.2 1.5 1.7 2 2.5 3 3.5 4 5]; K-D=[1e-6 0.1 0.2 0.4 0.7 1 1.1 1.2 1.5 1.7 2 2.5 3 3.5 4 5];

The Name of each files like this one (MTN100_k+0.1_k-T_0.1_k-D0.4_h1_GTP0.txt) How can I read these files in Matlab. I need to work with each file separately. I tried to use dlmread and fscan but it is not helpful. Any help would be greatly appreciated. I will be grateful to you.

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Answer 1

Salaheddin Hosseinzadeh 2014-8-19

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Hi Ahmed,

It's really good that the files name has an order, you can use that to write a program to automatically open a specific file.

What you need to do is to open the text file and read it. dlmread and fscan are used after you opened the file, at the end you need to close the file.

I'll add you some links to help you do this.

Good Luck.

http://www.mathworks.co.uk/help/matlab/ref/fopen.html?searchHighlight=plot

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Salaheddin Hosseinzadeh 2014-8-19

编辑：Salaheddin Hosseinzadeh 2014-8-19

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Ahmed,

You need some programming, just write an algorithm to generate the correct file name automatically.

for example if your file names are

MTN100_k+0.1_k-T_0.1_k-D0.4_h1_GTP0.txt)

MTN100_k+0.1_k-T_0.1_k-D0.4_h1_GTP1.txt)

MTN100_k+0.1_k-T_0.1_k-D0.4_h1_GTP2.txt)

You can generate file names with a single for loop

for i = 0:1:2
  fileName = ['MTN100_k+0.1_k-T_0.1_k-D0.4_h1_GTP',num2str(i),'.txt'];
  fopen(fileName);
  % do the rest of your processing.
  fclose(fileName);
end % terminating the for loop

in C++ you put the string together by adding them

str = str1 + str2...;

In MATLAB you can simply concatenate them as follow

str = [str1,str2,str3]

I assumed you're mainly using C++ and not really familiar with how to do the similar things in MATLAB.

Hope this is helpful enough.

Ahmed 2014-8-19

编辑：Ahmed 2014-8-19

Thanks Salaheddin, I think you got it, I need some programming, just write an algorithm to generate the correct file name automatically.

for example if your file names are

MTN100_k+0.1_k-T_0.1_k-D0.4_h1_GTP0.txt)

MTN100_k+0.1_k-T_0.1_k-D0.7_h1_GTP0.txt)

MTN100_k+0.1_k-T_0.1_k-D1_h1_GTP0.txt)

according to these values h=[1]; k+=[0.1 0.2 0.4 0.7 1 1.1 1.2 1.5 1.7 2 2.5 3 3.5 4 5]; K-T=[1e-6 0.1 0.2 0.4 0.7 1 1.1 1.2 1.5 1.7 2 2.5 3 3.5 4 5]; K-D=[1e-6 0.1 0.2 0.4 0.7 1 1.1 1.2 1.5 1.7 2 2.5 3 3.5 4 5];

h1 and GTP0 are fixed I just need to change k+,k-T,k-D