opening many files and changing code to match file name

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Hello,
I was hoping that somebody might be able to help me with a problem that I have. I have 1000 files in the current directory called
RW1.a_process
RW2.a_process
RW3.a_process...
RW1000.a_process
I was wondering for each file how can I open it and change 2 lines in the code to be the same as the file name.
This file is called RW1.a_process
You will see RW1 in the two places marked red.
Is there anyway that I could do this for the remainder of the files? It would take me hours to do it manually.
Sincere thanks
John
  4 Comments
Rick Rosson
Rick Rosson on 18 Mar 2012
Are the two lines of text always lines 2 and 15, or do they change location from one file to the next?
John
John on 18 Mar 2012
Hello Jiro and Rick,
I'm using a software that is based on the Matlab environment. However, in order to run a simulation a process file is necessary.
What I did was, I copied an original process file a 1000 times and changed the file names to RW1.a_process ... RW1000.a_process.
The process files are all the same, except for the two parts that I've marked in red. The first part is just the display name in the program and the second corresponds to separate .mat file which contains data for the simulation. They are named RW1.mat...RW1000.mat
I could do it manually but since I have a 1000+ files it would take days to complete.
So just to confirm the two lines of text are always lines 2 and 15.
Jiro - I hope this answers your question too.
Thank you
Regards
John

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Accepted Answer

Jiro Doke
Jiro Doke on 18 Mar 2012
This is probably a little too specific to your case, i.e. it's looking for a particular text. I'm just using strrep but if it doesn't work, you may have to look at regexprep.
In general, I agree with Rick that you should do this from the beginning (using your original file), instead of creating 1000 copies, changing the file names, and then changing those 2 lines.
d = dir('*.a_process');
for id = 1:length(d)
[p, name] = fileparts(d(id).name);
fid = fopen(d(id).name, 'r');
str = textscan(fid, '%s', 'delimiter', '\n', 'whitespace', '');
fclose(fid);
% Replace Strings
newStr = strrep(str{1}, 'Run RW Cycle', ['Run ', name, ' Cycle']);
newStr = strrep(newStr, 'RW.mat', [name, '.mat']);
% Overwrite
fid = fopen(d(id).name, 'w');
fprintf(fid, '%s\n', newStr{:});
fclose(fid);
end

More Answers (1)

Rick Rosson
Rick Rosson on 18 Mar 2012
It may be easier to delete all of the files except for the original source file, and then use MATLAB to create all of the copies for you, but with the two specific lines customized on each copy.
Maybe, for example:
for k = 2:1000
fileName = ['RW' num2str(k)];
source = fopen( 'RW1.a_process','r');
target = fopen([fileName '.a_process'],'w');
Ln = 0;
while ~feof(source)
Ln = Ln + 1;
aLine = fgetl(source);
if Ln == 2
aLine = sprintf(...);
else
if Ln == 15
aLine = sprintf(...);
end
end
fprintf(target,'%s\n',aLine);
end
fclose(target);
fclose(source);
end
I realize that this code is not optimized, but it may help as a starting point.
HTH.
Rick

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