appending a file

i have a file called hello.txt using wordpad which contains the matrix

2 7 3

2 6 9

now i have a vector v = [1 2 3] and i want to add this vector to the hello.txt file so when i open the hello.txt file i should have

2 7 3

2 6 9

1 2 3

how can i do this

Answer 1

[Walter Roberson]

fid = fopen('hello.txt', 'a+');
fprintf(fid, '%d %d %d\n', v);
fclose(fid);

[lowcalorie]

this overwrote my data it did not add data to the data already there

[Walter Roberson]

Change the 'a+' to 'at'

And while you are at it, switch to a more modern text editor ;-)

[Walter Roberson]

See, Jan, people do still use WordPad and still need the 't' permissions ;-)

[Walter Roberson]

>> !cat hello.txt

2 7 3

2 6 9

>> fid = fopen('hello.txt','at')

fid =

3

>> v = [1 2 3]

v =

1 2 3

>> fprintf(fid, '%d %d %d\n', v);

fclose(fid);

>> !cat hello.txt

2 7 3

2 6 9

1 2 3

Answer 2

[Walter Roberson]

Your existing question is still here and still active. Please do not open duplicate questions: it just leads to frustration and confusion.

If you require answers within 10 minutes (as implied by the time between your reply here and the time you opened the duplicate question), then you should be hiring a consultant.

[Wayne King]

I second Walter's sentiment. People are volunteering their time to help you.