getting error in for loop

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Nudrat Sufiyan
Nudrat Sufiyan 2022-5-30
评论： Torsten 2022-5-30
Array indices must be positive integers or logical values.
Error in Untitled4 (line 27)
Idsat(i)=r1*(Vgs-(r2)+Vds(i));
for i=0:length(Vds)
Idsat(i)=r1*(Vgs-(r2)+Vds(i));
end
  1 个评论
Sam Chak
Sam Chak 2022-5-30
Have you checked if your array indices are positive integers or logical values?

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回答（2 个）

Torsten
Torsten 2022-5-30
编辑：Torsten 2022-5-30
Loop indices don't start at 0, but at 1 in MATLAB:
for i=1:length(Vds)
Idsat(i)=r1*(Vgs-(r2)+Vds(i));
end
instead of
for i=0:length(Vds)
Idsat(i)=r1*(Vgs-(r2)+Vds(i));
end
Nudrat Sufiyan
Nudrat Sufiyan 2022-5-30
Thanks , but it still showing error.
can you please check my code once
clc;
m=0.23; %#1%
q=1.6e-19;
Nd=5e18;
d1=22e-7;
d2=1e-7;
a0=3.189e-8;
a1=(-0.077*m+3.189)*1e-8;
c13=(5*m+103);
c33=(-32*m+405);
e33=(0.72*m+0.73)*1e-4;
e31=(-0.11*m-0.49)*1e-4;
fis=1.4*m+0.87;
deff=23.01e-7;
detaEg=6.13*m+(1-m)*3.42-m*(1-m)+(m-1)*3.42;
detaEc=0.7*detaEg;
EA=(8.9-0.4*m)*8.85e-14;
Eoff=EA+((e33)^2)/c33;
EF=2.1;
sigema=((-m*(5.2e-6))+(2*(a0-a1)/a1)*(e31-e33*c13/c33)*1e-4);
Ppz=(2*(a0-a1)/a1)*(e31-e33*c13/c33)*1e-4;
r1=q*EA/deff;
r2=fis-(EF-(detaEc+q^2/EA*sigema^2*d2))/q;
Vgs=-2;
Vds=0:0.01:0.8;
for i=1:length(Vds)
Idsat(i)=r1*(Vgs-(r2)+Vds(i));
end
xlabel('vds');
ylabel('Idsat');
plot(Vds,Idsat)
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Torsten
Torsten 2022-5-30
编辑：Torsten 2022-5-30
It varies, but you don't see it in the plot since r2 = -7.731499999999999e+18.
Do you understand what I mean ?
If you plot a variable
T = 100000000 + 0:0.01:0.8
you won't see the 0:0.01:0.8.
Torsten
Torsten 2022-5-30
@Nudrat Sufiyan comment moved here
It means I should change the value of r2

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