MATLAB: Editing a txt file and replace a specifics lines

replacementstringtxt file

Dear all, my question is about the edition of an txt file and the replacement of the 4 and the 5 line and keep the above ones and the after ones: txtfile = ZZZ.txt

Not change
Not change
Not change
TO change
TO change

Any suggestions please.

Best Answer

Read your text file

fid=fopen('ZZZ.txt')
s=textscan(fid,'%s')
fclose(fid)
out=[s{:}]

Then replace whatever you want

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MATLAB: How to replace a portion of data with another

This works. The example input and output files are attached.

newData = [1,2;3,4;5,6;7,8];
newName = 'blah.prw';
fid = fopen('oldfile.txt', 'rt');
fod = fopen('newfile.txt', 'wt');
for k = 1:3
    fprintf(fod,'%s\n',fgetl(fid));
end
str = regexprep(fgetl(fid),'\w+\.prw',newName);
fprintf(fod,'%s\n',str)
cmp = ' !-';
while ~isequal(intersect(str,cmp),cmp)
    str = fgetl(fid);
    fprintf(fod,'%s\n',str)
end
fprintf(fod,'          %.7f          %.7f\n',newData.')
while ~isempty(str)
    str = strtrim(fgetl(fid))
end
fprintf(fod,'          \n')
while ~feof(fid)
    fprintf(fod,'%s\n',fgetl(fid))
end
fclose(fid);
fclose(fod);

MATLAB: How to change code in scripts using command

You can read the content of your m-file

fid=fopen('file.m')
line=fgetl(fid);
k=1;
while ischar(line)
   out{k,1}=line;
   line=fgetl(fid);
   k=k+1;
end
fclose(fid)

Insert what you want in the cell array out. Then save it in the original file

fid= fopen('file.m','w')
for k=1:numel(out)
   fprintf(fid,'%s\n',out{k})
end
fclose(fid)

Best Answer

Related Solutions

MATLAB: How to replace a portion of data with another

MATLAB: How to change code in scripts using command

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