remez function not working

I am using the remez function in a Filter and impulse response exercise. It is however giving me an error "??? Index exceeds matrix dimensions." Below is the short code where the error is coming in:

N = 41; F = [0 F1 F2 1]; M = [0 0 1 1]; B = remez(N-1,F,M)

I am struggling to figure out what it is I am doing wrong

[Nicko]

Thank you Wayne for that answer. I will try that but to add on my info: Fstop=2005; Fcutoff=2500; F1=2*Fcutoff/Fs; F2=Fstop/Fs;

[Nicko]

Thanks again. My Fs=10000. I did what you suggested and still does not work. I'm starting to think the remez function I'm using might be the problem but not sure where to download a trusted one

Answer 1

[Wayne King]

You have not told us what F1 and F2 are, so we cannot reproduce your problem.

But, something like:

     N = 41; 
     F = [0 0.2 0.4 1]; 
     M = [0 0 1 1]; 
     B = remez(N-1,F,M);

will work.

[Ismail Ouraich]

I ran you code, but I still got this error message: "Undefined function 'remez' for input arguments of type 'double' " . Any help with this would greatly appreciated.

Answer 2

[Wayne King]

You did not tell us what Fs is

   Fstop=2005; Fcutoff=2500; 
   F1=2*Fcutoff/Fs; F2=Fstop/Fs;

but the potential problem is here that your F1 can be higher than your F2 value. Your frequencies have to be increasing in the frequency vector