problem in filtfilt function

i am working on a project using fdatool. I have a problem in filtfilt function. This function is not working. My program is

A=fopen('A_DATA.TXT');
A_DATA=fread(A);
ya=filtfilt(Num,Den,A_DATA);
C=fopen('C_DATA.TXT');
C_DATA=fread(C);
yc=filtfilt(Num,Den,C_DATA);
G=fopen('G_DATA.TXT');
G_DATA=fread(G);
yg=filtfilt(Num,Den,G_DATA);
T=fopen('T_DATA.TXT');
T_DATA=fread(T);
yt=filtfilt(Num,Den,T_DATA);
y=ya.^2+yc.^2+yg.^2+yt.^2;
y=y/max(y);
plot(y);

Here A_DATA.TXT, C_DATA.TXT,G_DATA.TXT,T_DATA.TXT are binary sequence text file. num, den are filter coefficient which have been exported through fdatool.

filtfilt function is not working.

Please tell me what will i do?

[the cyclist]

Several things in your question make it very difficult to help you:

- You did not use the code-formatting button, so your code is very hard to read.

- We do not have access to your data files, so we can't understand specifically what might be causing your error.

- You don't mention the actual error message you are getting, or whether you simply get a result that you don't think makes sense.

The best thing for getting a rapid answer would be if you could create a small dataset that causes the error you are seeing, and post code with real data, without making us guess at the possible contents of your data files.