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Question

opening multiple files in loop

bigmike500 (Mechanical)

(OP)

12 Oct 04 08:23

i am wondering if anyone can help me with my problem i am trying to open multiple dat files that contant different values from a measurement device. these come in the form 1,2,3...N etc. i want to make a for loop that will open one of these files do some processing on the data in it then output a singular value. the data processing i am fine with, the problem i am having is opening the file in a loop. this is the code i am using in the loop but due to the comma's matlab looks for the file N, can i get matlab to look for the file of value N.

fopen('N.dat')

so what i want to do is have N the loop counter and open the file 1, do some processing on that then close it and finish the loop, then go onto file 2 etc etc.
hope it is clear what i am trying to do and would appriciate any help that people can give me.
Cheers
M

tompouce (Aeronautics) · Answer 1 · 2004-10-12 09:24:12

BigMike,

look at the "eval" function, not very simple to understand, but once you knoe how to use it a marvel.

The code will look like

CODE

eval(['fopen(''',num2str(k),'.dat'')'])

tompouce

MikeyP (Aerospace) · Answer 2 · 2004-10-12 17:58:34

Although the eval function is a useful thing to be aware of, it is not actually required in this instance. You can simply concatenate the string inside the function using square brackets:

CODE

fopen([int2str(k) '.dat']);

M

--
Dr Michael F Platten

bigmike500 (Mechanical) · Answer 3 · 2004-10-12 19:17:11

thanks for that guys, ended up using mikeyP's suggestion. worked first time, but will look into the eval function.
M

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