MATLAB: Remez function not working

filtersremez

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

Best Answer

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.

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hi, John,

You can compute theirs spectrums , the only thing you need is the sample rate , here is an example :

1) Functions :

 % Constants 
 K=2.33;
 A=1.45;
 Fs=20;
 t=0:1/Fs:10;
 a=0.45;
 % Anonymous function
 u=@(t) cos(t)
 f1=K*t.*(u(t+a/2)-u(t-a/2));
 f2=A*cos(pi*t/2).*(u(t+2)-u(t-2));
 f3=A*exp(-2*(t-1)).*u(t-1);
 figure, plot(t,f1,t,f2,'r',t,f3,'g'), legend('f1','f2','f3');
 grid on,

2) Spectrums :

 n=length(f1); % they all have the same length  ..
 N=ceil(log2(n));
 F1=fft(f1,2^N);
 F2=fft(f2,2^N);
 F3=fft(f3,2^N);
 Freq=(Fs/2^N)*(0:2^(N-1)-1);
 figure,
 plot(Freq,abs(F1(1:end/2))), xlabel(' Frequ in Hz'), title(' F1');
 figure,
 plot(Freq,abs(F2(1:end/2))), xlabel(' Frequ in Hz'), title(' F2');
 figure,
 plot(Freq,abs(F3(1:end/2))), xlabel(' Frequ in Hz'), title(' F3');

MATLAB: This code only plot for last value of r1, how to plot for all values of r1

r1 = [0 0.1 0.2 0.5 1 2];
f1 = 0:0.1:1;
f2 = 1-f1;
for j=1:length(r1)
    if r1(j)<1
        r2(j) = 1-r1(j);
    else
        r2(j)=r1(j);
    end
    for i=1:11
        F1(i) = ((r1(j).*f1(i).^2)+(f1(i).*f2(i)))./((r1(j).*f1(i).^2)+(2*f1(i).*f2(i))+(r2(j).*f2(i).^2));
    end
    plot(f1,F1);hold on
end

Best Answer

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MATLAB: This code only plot for last value of r1, how to plot for all values of r1

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