Plot command, how to plot a signal with FFT result?

just started with Matlab today, like it alot.

im trying to plot a signal and then the FFT result where they are using the same graph/plot.

Tried doing this several times, the input signal plots out, the FFT result is this tiny scrunched up little plot in the upper left. the way of putting 2 plots together in the same chart is the question. right now it does one, then its paused, then the next one.

thanks

Fs = 10;                    % Sampling frequency
T = 1/Fs;                     % Sample time
L = 100;                     % Length of signal
t = (0:L-1)*T;                % Time vector
% Sum of a 50 Hz sinusoid and a 120 Hz sinusoid
%x = 0.7*sin(2*pi*50*t) + sin(2*pi*120*t); 
x = cos(3*pi*(t)) + (.5 * (cos(2*pi*(t))));
y = x ;  %+ 2*randn(size(t));     % Sinusoids plus noise
title('Signal Corrupted with Zero-Mean Random Noise')
xlabel('time (milliseconds)')
NFFT = 2^nextpow2(L); % Next power of 2 from length of y
Y = fft(y,NFFT)/L;
f = Fs/2*linspace(0,1,NFFT/2+1);
plot(Fs*t(1:50),y(1:50))

pause;
% Plot single-sided amplitude spectrum.
plot(f,2*abs(Y(1:NFFT/2+1))) 
title('Single-Sided Amplitude Spectrum of y(t)')
xlabel('Frequency (Hz)')
ylabel('|Y(f)|')
%

Answer 1

[bym]

Why would you want to plot the time domain & Frequency domain on the same plot? Take a look at subplot as in :

subplot(211)
plot(Fs*t(1:50),y(1:50))
subplot(212)
plot(f,2*abs(Y(1:NFFT/2+1)))

[Bradley Rogers]

yes that is perfect thanks, but what does the (211) and (212) stand for?

[bym]

the first 2 numbers are the size of the plot grid (here 2 row 1 column) and the 3rd number is the index of the "active plot"