MATLAB: The below program is the Ids Vds characteristics of a DG MOSFET. and I am getting the error as Matrix dimensions must agree.. Please help me by fixing it

for different values of ids and vdsfor loopgraph

if true
  clear all;
hfin=1;
tsi=20
W=2*hfin*tsi;
Vth=1;
Leff=180;
DIBL=1.127*(W\Leff);
vth=Vth-DIBL;
lambda=25*10^-5;
u=1360;
ld=0.1;
Ec=1.5*106;
Cox=60;
Vds=0:0.5:10;
vgs=input('ENTER THE Vgs in volts');
m=length(Vds);
for i=1:m
if vgs < Vth
current(1,i)=0;
elseif Vds(i) >= (vgs - Vth)
current(1,i)=0.5* (vgs - Vth)^2*(1+lambda*Vds(i));
elseif Vds(i) < (vgs - Vth)
current(1,i)=((vgs-vth)*Vds(i))- 0.5*(Vds(i)^2)*(2*W*u*Cox/(Leff-ld+(Vds/Ec))+lambda*2*W*Cox/(Leff-ld)^2);
end
end
plot(Vds,current(1,:),'b')
xlabel('Vds, V')
ylabel('Drain Current,A')
title('I-V Characteristics of a MOSFET')
end

Best Answer

See the attached file and modified code..
clear all;
hfin=1;
tsi=20
W=2*hfin*tsi;
Vth=1;
Leff=180;
DIBL=1.127*(W\Leff);
vth=Vth-DIBL;
lambda=25*10^-5;
u=1360;
ld=0.1;
Ec=1.5*106;
Cox=60;
Vds=0:0.5:10;
vgs=input('ENTER THE Vgs in volts');
m=length(Vds);
for i=1:m
if vgs < Vth
current(1,i)=0;
current1(1,i)=0;
elseif Vds(i) >= (vgs - Vth)
current(1,i)=0.5* DIBL * ((vgs - Vth)^2)*(1+lambda*Vds(i));%Added DIBL
elseif Vds(i) < (vgs - Vth)
current(1,i)= DIBL*((vgs-Vth)*Vds(i) - 0.5*(Vds(i)^2))*(1+lambda*Vds(i)); %Simplified equation by approximation
end
end
plot(Vds,current(1,:),'b')
xlabel('Vds, V')
ylabel('Drain Current,A')
title('I-V Characteristics of a MOSFET')
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