MATLAB: How to change a specific number in a specific line in a text file

regexpreptext files

Hi,

I have a txt file and I need to change a specific number in a specific phrase. I want to change the number after the phrase:

UINL_Fuel_C1_Inlet1 56

The number after it as of now is 56 and I want to change it to one of my new values called new_velocity that is calculated in my code. I tried using regexprep but it is not working.

Thanks

Best Answer

filecontent = fileread('YourFileNameHere.txt');
newcontent = regexprep(filecontent,'UINL_Fuel_C1_Inlet1 56', sprintf('UINL_Fuel_C1_Inlet1 %g', new_velocity));
fid = fopen('DifferentFileNameHere.txt', 'w');
fwrite(fid, newcontent);
fclose(fid);

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You are closing the file in the loop. close the file after the loop. I assume the below should work.

function read_datapattern(filename)
fid = fopen(filename,'rt');
if fid < 0
  error('error opening file %s\n\n',filename);
end
pattern = fgets(fid);
for n = 1:32767
  nextline = fgets(fid);
  pattern = strcat(pattern, nextline);
fprintf(pattern);
fprintf('\n');
end
fclose(fid);

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filecontent = fileread('YourFile.txt');
newcontent = regexprep(filecontent, '\n\n+', '\n');
fid = fopen('NewFile.txt', 'w');
fwrite(fid, newcontent);
fclose(fid);

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