how to plot multiple curves in same figure

I want to plot Id-vds curve for different length of Aln as it is mentioned as 'daln' in code. I have plotted for 1nm -daln, and need graph for different daln =1.2,3,4,5 nm .

This is the code for daln = 1nm

clear all;
E0=8.85e-12;
Ealgan=10.31;
talgan=23e-9;
calgan=(Ealgan/talgan);
dit=1.2e12;
q=1.6e-19;
gamma=(1/(1+dit*q/calgan));
nd=1.5e16;
daln=1e-9;
fim=(5.1*1.6e-19);
xaln=(1.9*1.6e-19);
fi0=(3.4*1.6e-19);
fis0=(gamma*(fim-xaln)-(gamma*q*nd*daln/calgan));
sigmapol=3.38e17;
sigmaaln=3.38e17;
Ealn=(10.78*E0);
detaEc=(0.343*1.6e-19);
Vt=fis0-detaEc-(sigmapol*q*daln/Ealn);
cq=3.436e15;
ceq=(calgan*cq/calgan+cq);
mu=0.09;
g=33.3;
Vds=0:0.5:6;
vgs=input('ENTER THE vgs in volts');
m=length(Vds);
for i=1:m
    if vgs < Vt
        current(1,i)=0;
        current1(1,i)=0;
    elseif Vds(i) >= (vgs - Vt)
        current(1,i)=((mu*ceq/2)*(g)*(vgs-Vt)^2); %Simplified equation by approximation
    elseif Vds(i) < (vgs - Vt)
        current(1,i)=(mu*ceq/2)*(g)*(2*(vgs-Vt)*Vds(i)-Vds(i)^2);%Added DIBL
    end
end
plot(Vds,current(1,:),'b')
xlabel('Vds, V')
ylabel('Drain Current,A')
title('I-V Characteristics of a hemt') 

Answer 1

[Jan]

Create a loop:

axes('NextPlot', 'on');   % As: hold on
...
for daln = 1:5
    ...
end

[Nudrat Sufiyan]

Thanks Jan,can you please explain one steps, where I'll write

axes('NextPlot', 'on'); % As: hold on

...

for daln = 1:5

...

end

[Jan]

Try it. You cannot damage Matlab or the computer.

Set the axes() command e.g. on top of the code (after omitting the vrute clearing header "clear all", which is touzght in beginner lessons, but rarely useful in real programs).

Then replace the line

daln = 1;

by

for daln = 1:5    

and insert

end

where you want to stop the loop.

[Nudrat Sufiyan]

ok, Thanks, i'll try