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Error while trying to use diff comand

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Nathan Donatell
Nathan Donatell 2019-11-10
关闭： MATLAB Answer Bot 2021-8-20
This is the code that I created and I am trying to differentiate Id and Vt but every time I run the program I keep getting this error, "Difference order N must be a positive integer scalar." I am not sure how to get rid of this error.
Here is my code:
x = 0:.01:.65;
q=1.6022e-19;
C=28.73;
T=273+C;
k=1.3806e-23;
Is=1.0e-12;
V= x;
n=1;
Vt=(k*T)/q;
Id=Is*((exp(V/(n*Vt))));
plot(V,Id)
axis([-0.5,0.7,-0.1,0.3])
grid on
title('I-V Characteristics of Diode')
xlabel(' Voltage ')
ylabel(' Current ')
R = diff(Vt,Id);

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回答（1 个）

Star Strider
Star Strider 2019-11-10
It is not clear to me what you want to do.
If you want to take the numerical derivative of ‘Id’ using step size ‘Vt’ use the gradient function as:
R = gradient(Id,Vt);
This also has the advantage that ‘R’ is the same size as ‘Id’.

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