data appending in text file

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Mohammad
Mohammad le 14 Août 2013
Hi,
I created a text file using MATLAB. For example, 10 by 3 matrix and I saved it as a text using fopen and fprint in particular format. Now I want to append lines (data)to this text, say at row 1, row 5, and row 10, i.e at a fixed interval. How can I do this. Remember, I need to add lots of these lines.
I greatly appreciate any help.
Thanks Rafiq

Réponse acceptée

Cedric
Cedric le 14 Août 2013
Modifié(e) : Cedric le 14 Août 2013
Instead of opening the file with write permission using 'w', open it in with append permission using 'a'.
  7 commentaires
Mohammad
Mohammad le 15 Août 2013
Cedric,
So kind of you. Thanks a lot. This solved my problem and saved me a lot of time. Thanks again.
Rafiq
Cedric
Cedric le 15 Août 2013
You're welcome!

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Walter Roberson
Walter Roberson le 14 Août 2013
The only way to insert lines into a text file is to read in the file and write out the modified file. There is no way to seek directly to a particular line, and there is no way to insert in the middle of a text file.
Depending on what you want to insert into the file, you may wish to use system utilities such as "sed" or "awk" or "perl"

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