Error in using fir1() function

I have written the following code for an FIR filter design.

clc;
close all;
clear all;
fp=input('enter the pass band frequency:');
fs=input('enter the stop band frequency:');
rp=input('enter the pass band attenuation:');
rs=input('enter the stop band attenuation:');
f=input('enter the sampling frequency:');

num=-20*log10(sqrt(rp*rs))-13;
dem=14.6*(fs-fp)/f;
n=ceil(num/dem);
n=abs(n);

wp=-2*fp/f;
ws=-2*fs/f;
wn=(ws+wp)/2;

if(rem(n,2)==0)
    m=n+1;
else
    m=n;
    n=n-1;
end

w=hann(m);

b=fir1(n,wn,w);
freqz(b,1,500,3000);
title('magnitude and phase response');

During execution, the following values for the input are provided:

enter the pass band frequency:1000

enter the stop band frequency:1200

enter the pass band attenuation:0.2

enter the stop band attenuation:45

enter the sampling frequency:3000

The error displayed after entering the values is:

??? Error using ==> fir1 at 77 Frequencies must fall in range between 0 and 1.

Error in ==> hanning1 at 35 b=fir1(n,wn,w);

Please help in resolving the error.

Answer 1

[Wayne King]

Why are you putting - signs on these:

   wp=-2*fp/f;
   ws=-2*fs/f;

Take out the - signs.

[Arnab Ray]

Thank you for solving. The problem has been resolved.