[SOLVED] FFT of given signal in matlab

[pravinkadam2]

I am trying to replot FFT of following signal in MATLAB
But i am not getting exact result
Signal having sampling frequency is 1024 Hz and the sampling time is 1s
and for more description please find attached file
Its very urgent PLEASE help me
thank u in advance

 

[anmol]

Try,
t=0:Ts:10;
y=x1+x2+x3;
plot(t,abs(fft));

 

[pravinkadam2]

That i also know ,But i am not getting how to plot second fuction ie x2(t) .They are telling exponentially decaying fuction.
Otherwise i am attaching my matlab file just find out what mistake i am doing.
clear all
close all
clc
t=linspace(0,1,1024);
y1 = sin(2*pi*30*t)+cos(2*pi*50*t) ;
for i=1:1024
ii=mod(i,50);
if ii==0
y(i)=0;
else
y(i)=exp(-20*t(ii)).*sin(20*pi*t(ii)) ;
end
end
Fs = 1024; % Sampling frequency
L = 1024;
%y3 = wgn(1,1024,0);
%y3=randn(1,length(t));


y3=wgn(1, 1024,5,20, 'dBm', 'real');
ytot=2*y1+9*y+y3;

Y=ytot;
figure(1)
plot(t,Y);
axis([0 1 -6 8])

freq = 0:1:Fs/2 ;
NFFT = 2^nextpow2(L); % Next power of 2 from length of y
Y1 = fft(Y,NFFT)/L;
xf = fft(Y)/length(Y) ; % signal
xfr = xf ; % copy
xf2 = abs(Y1) ;
xf3 = xf2(1:513) ;

figure(2)
plot(freq, xf3*1024) ;
%axis([0 250 0 1.2])
xlabel('frequency in(Hz)')
ylabel('amplitude')