write in a specific line of text file

Hi all,

I'm writing a code and I would save the result in a specific line of text file. for example, the code should write the result on .txt file from line 6 or 7 but I don't know how can I do it. I've used

fid = fopen('z.txt', 'w');
fprintf(fid, '%d\r\n',MyResult);
fclose(fid)

But it can just write in a new line no each line as I want. Could you please help me

Hamed

[Rik]

You mean you want to append a line? Or should the resulting function be able to replace the line of text? The documentation (type doc fopen) explains how to do the first, the second will be more tricky.

[hamed]

Actually, I have a main .txt file with some headers (from line 1 to 6) and in each time my code generates a matrix and I want to add this data to my text file after line 8 or 9. The header should be unchanged.

[Rik]

If you want to append lines, read the doc. If you want to do something else, you'll have to explain it more, preferably with some examples, because right now, I don't know if I understand you.

[hamed]

ok, let me explain more I have a text file with 6 lines header, for example, name and address of a company

my code creates a matrix (50*5) and I want to add this matrix after line 8.

Answer 1

[Rik]

Use the append switch in fopen, fprinft an empty line, and fprintf the matrix with the FormatSpec of your choosing.