Error using plot Vectors must be the same length.

Create a signal consisting of two successive sine waves with frequencies of 10 Hz and 20 Hz and additive noise. Filter the signal with an adaptive selective filter and plot in one graphic window: 1) the initial signal; 2) filtered signal; 3) error signal.

fs = 200; N = 1000; t = (0:(N-1))/fs; 
s1 = sin(2*pi*10*t); s2 = sin(2*pi*20*t); 
s = [s1, s2]; v = 0.4*randn(size(s)); 
t = (0:(N-1))/fs; 
x = s + v;
delay = 5; % затримка 
xd = [x(delay:end), zeros(1,delay-1)];
L = 64; mu = 0.001; 
[w, y, e] = lms(x, xd, mu, L); 
figure(4) 
subplot(311), plot(t, x), grid on 
subplot(312), plot(t,y), grid on 
N = 1000
subplot(313), plot(t,e), grid on 
fprintf('var(e) = %4.3f\n',var(e))

Answer 1

[Walter Roberson]

t = (0:(N-1))/fs; 
s1 = sin(2*pi*10*t); s2 = sin(2*pi*20*t); 
s = [s1, s2];

s is a row vector that is twice as long as t (since it is two vectors put together, each the same size as t)

x = s + v;

x is the same size as s, so is twice as large as t

subplot(311), plot(t, x), grid on 

there you try to plot t against x but x is twice as large as t.

[Walter Roberson]

Possibly you want the second assignment to t to be

t = (0:(size(s,2)-1))/fs;

[Sofiya]

Thanks a million!!!