Error (( vector must be the same length))

Hello I have this code and it gives that error at plot(t,x_bp)could you please help me thank you indeed

% Generate a lowpass signal fs = 1000; % sampling frequency (Hz) t = 0:1/fs:1; % time vector (s) f1 = 10; % frequency of the signal (Hz) x = sin(2*pi*f1*t); % lowpass signal

% Perform FFT and IFFT X = fft(x); X_bp = [zeros(1,100), X(101:401), zeros(1,499)]; % create bandpass frequency domain signal x_bp = ifft(X_bp);

% Create a bandpass filter fc = [5 15]; % bandpass cutoff frequencies (Hz) order = 50; % filter order b = fir1(order, fc/(fs/2)); % FIR filter coefficients

% Apply the bandpass filter x_bp_filt = filtfilt(b, 1, x_bp);

% Plot the results subplot(2,2,1); plot(t, x); title('Lowpass Signal'); xlabel('Time (s)'); ylabel('Amplitude');

subplot(2,2,2); plot(t, x_bp); title('Bandpass Signal (Frequency Domain)'); xlabel('Time (s)'); ylabel('Amplitude');

subplot(2,2,3:4); freqz(b); title('Filter Frequency Response');

Answer 1

[aakash dewangan]

length of t and x_bp are not same. Theymust have same length to plot the graph using plot command.

You may use maximum available points to plot by modifying your code as

% Generate a lowpass signal 
fs = 1000; % sampling frequency (Hz) 
t = 0:1/fs:1; % time vector (s) 
f1 = 10; % frequency of the signal (Hz) 
x = sin(2*pi*f1*t); % lowpass signal
% Perform FFT and IFFT 
X = fft(x); 
X_bp = [zeros(1,100), X(101:401), zeros(1,499)]; % create bandpass frequency domain signal 
x_bp = ifft(X_bp);  % Create a bandpass filter 
fc = [5 15]; % bandpass cutoff frequencies (Hz) 
order = 50; % filter order 
b = fir1(order, fc/(fs/2)); % FIR filter coefficients
% Apply the bandpass filter 
x_bp_filt = filtfilt(b, 1, x_bp);
% Plot the results 
subplot(2,2,1); plot(t, x); title('Lowpass Signal'); xlabel('Time (s)'); ylabel('Amplitude');
subplot(2,2,2); plot(t(1:900), x_bp(1:900)); title('Bandpass Signal (Frequency Domain)'); xlabel('Time (s)'); ylabel('Amplitude');
subplot(2,2,3:4); freqz(b); title('Filter Frequency Response');

[Melika Eft]

Thanks for your attention it was very helpful