I need help with using the If-Else loop containing scalar and nonscalar

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Steven 2013-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/59464-i-need-help-with-using-the-if-else-loop-containing-scalar-and-nonscalar

Create a plot of iD as a function of vDS from 0  ≤ vDS ≤ 8 V, for three values of vGS =2, 3, and 4 V.  
Constants:  Kn=0.2 mA/V2; VTN =1.2 V; λ=0.01 V-1.

Here is my work I have so far:

Vds = 0:0.1:8;            
Vgs = 2:1:4;              
kn = 0.2;                 
Vtn = 1.2;                
lambda = 0.01;            
Vds_Sat = Vgs - Vtn;
if (Vds <= Vds_Sat)  
    ID = Kn*(2*(Vgs-Vtn)*Vds - (Vds^2));
else (Vds >= Vds_Sat)
    ID = Kn*((Vgs - Vtn)^2*(1 + lambda * Vds));
end
plot(Vds.,ID)

It is telling me I have an error on line 7 and that my matrix dimension must agree, could you please help me with this?

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Walter Roberson 2013-1-22

There is no such thing as an "If loop". There is an "if statement". Loops execute the body multiple times; statements execute the body (or not) exactly one time.

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