Adding Data to an existing file with matlab

[epeus]

anyone know how to add data to an existing data file.

ie, i have a data file and i want to add a new line of data (matrices) to the file.

i have looked at the save -append option but that overwrites existing variables and can only be used on .mat files (i think), i am using .dat files.

basically everytime i run my script i want it add a new line of data to my results data file.

hope someone else has worked this out!!

any help is greatly appreciated.

 

[smesajar]

Hello:

Try this piece of code

Fid=fopen('path_and_name.ext','a');
fprintf(Fid,'What you want to add');
fclose(Fid);

 

[epeus]

smesajar,

yes thats right...after a bit of research i came up with this:

note the 'a+' - to append to the existing file

fid = fopen('file.txt','a+');
fprintf(fid,'\n');
fprintf(fid,'%9.4f',var1,var2,var3);
fclose(fid);

fprintf is very powerful function - can generated very nicely formatted data files!

for more info on fprintf see:-

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/fprintf.shtml

cheerio