Why is my plot linear when the anonymous function z is clearly nonlinear?

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Alexander Ruscitto 2021-9-27

评论： John D'Errico 2021-9-27

Rt = 10688; v = 18; f = 9; KD = 7.73*10^(-5); Kx = 5.8*10^(-5); L0 = 2*10^(-9);

Req = [6000:12000];

z = @(Req) ((Req.*(1+v.*(L0/KD).*(1+Kx*Req).^(f-1)))/Rt)-1;

figure

plot(Req,z(Req));

Matt J 2021-9-27

It simply looks linear because you are plotting it over too narrow a range.

Req = 0:120000;

plot(Req,z(Req));

John D'Errico 2021-9-27

The funny thing is, the range of [6000:12000] probably SEEMS wide. But width is a subjective thing in this case.

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