MATLAB: How to change the scale for x-axis??

scaling

p_avg=1;        % average optical power
R=1;            % photodetector sensitivity
Rb=1;           % normalized bit rate
Tb=1/Rb;        % bit duration
df=Rb/100;      % spectral resolution
f=0:df:5*Rb;        % frequency vector
x=f*Tb;         % normalized frequency
temp1=(sinc(x)).^2;
a=R*p_avg;      
p=(a^2*Tb).*temp1;  
%p(1)=p(1)+((a^2)*Tb)*(sinc(0)^2)*(1/Tb);   % delta function at DC
p=p/(((p_avg*R)^2)*Tb);     % power normalization by energy per bit
plot(p)
The graph is plot as:
But the graph I should get is:
So, which parameter should I change in order to get the correct scale for x-axis?

Best Answer

p_avg=1;        % average optical power
R=1;            % photodetector sensitivity
Rb=1;           % normalized bit rate
Tb=1/Rb;        % bit duration
df=Rb/100;      % spectral resolution
f=0:df:5*Rb;        % frequency vector
x=f*Tb;         % normalized frequency
temp1=(sinc(x)).^2;
a=R*p_avg;      
p=(a^2*Tb).*temp1;  
%p(1)=p(1)+((a^2)*Tb)*(sinc(0)^2)*(1/Tb);   % delta function at DC
p=p/(((p_avg*R)^2)*Tb);     % power normalization by energy per bit
plot(f/Rb,p)
set(gca,'XLim',[0 4]);
set(gca,'YLim',[0 1]);
set(gca,'XTick',[0 1 2 3])
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