write to a text file...

Hello,

I want to read a text file and write it in to a desire line in the other text file?

Any help would be greatly appreciated!

thanks so much.

Loran

For example: I have a big text file and would like to add another text file data under the 'TIME 380' line. How should I search for the "TIME 380' line and add the data underneath..?

…..

TIME 350

TIME 360

TIME 370

TIME 380

++++ data from a text file++++

TIME 390

TIME 400

[Stephen23]

Double-posting will not encourage people to answer your questions. Please edit your original question , if it was not clear the first time you wrote it.

To solve your problem: learn to use a search engine, and read this:

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Guillaume]

bigfid = fopen(bigfile, 'rt+'); %open the big file in read/write text mode
infid = fopen(otherfile, 'rt'); %open the other file in read text mode
%read lines until you get to the insertion point:
l = fgetl(bigfid); %read first line
while ~strcmp(l, 'TIME 380') %or other comparison functions
  l = fgetl(bigfid);
end
insertpos = ftell(bigfid); %memorise insertion point
remainder = fread(bigfid); %read the rest of the file to rewrite after insertion
fseek(bigfid, insertpos, 'bof'); rewind to insertion point
fwrite(bigfid, fread(infid)); %copy content of other file at insertion point
fwrite(bigfid, remainder); %and write back the rest of the big file
fclose(bigfid);
fclose(infid);

Untested, there may be some minor errors, but you get the idea.