adding data to a text file
55 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
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 comentario
Walter Roberson
el 15 de Mzo. de 2012
Duplicate is at http://www.mathworks.com/matlabcentral/answers/32377-appending-a-file
Respuesta aceptada
Wayne King
el 15 de Mzo. de 2012
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 comentarios
Walter Roberson
el 15 de Mzo. de 2012
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.
Más respuestas (1)
Geoff
el 15 de Mzo. de 2012
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 comentarios
Walter Roberson
el 15 de Mzo. de 2012
"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.
Ver también
Categorías
Más información sobre Low-Level File I/O en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!