adding data to a text file

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lowcalorie
lowcalorie 2012-3-15
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
  1 个评论
Walter Roberson
Walter Roberson 2012-3-15
Duplicate is at http://www.mathworks.com/matlabcentral/answers/32377-appending-a-file

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采纳的回答

Wayne King
Wayne King 2012-3-15
You can use:
dlmwrite('FILENAME',M,'-append')
For example:
x = [2 7 3; 2 6 9];
dlmwrite('test.dat',x);
y = [1 2 3];
dlmwrite('test.dat',y,'-append');
  4 个评论
显示 2更早的评论
lowcalorie
lowcalorie 2012-3-15
if i already have a file what fopen should i be using
Walter Roberson
Walter Roberson 2012-3-15
Wayne's code is designed for the case where the file is _not_ open.
The code that opens the file is shown in your duplicate question, referenced in the above comments.

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更多回答（1 个）

Geoff
Geoff 2012-3-15
I remember answering an almost identical question from you the other day. It used the fopen() with the open-mode 'w' to overwrite.
To append, use the open-mode 'a'.
  2 个评论
lowcalorie
lowcalorie 2012-3-15
thats what im doing but it keeps overwriting there muct be something wrong with other parts of my script then
thanks
Walter Roberson
Walter Roberson 2012-3-15
"lowcalorie" is using WordPad to examine the file. "at" is needed instead of just "a", as WordPad is an old editor that only understands lines if they end in the combination CARRIAGE-RETURN LINEFEED which you do not get if you use only "a" permissions when you are using MS Windows.

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