Log(x) equation does not plot correctly

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Hello,

Here is my code:

x = -5:0.05:10;

y=log(x);

plot(x,y)

comet(x,y)

It won't let it animate. When i put x = 1:0.05:10; it does animate , but shouldn't matlab do it anyway? Why doesn't it animate from 1 to 10 even if i put -5 , every other function works fine? Maybe comet doesn't work with it?

If you have any ideas, please help.

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Answer 1

Cris LaPierre 2020-11-17

编辑：Cris LaPierre 2020-11-17

0 个投票

Perhaps reading the error message you get on the screen will help explain the issue:

Warning: Imaginary parts of complex X and/or Y arguments ignored.

Error using matlab.graphics.axis.Axes/set

Complex values are not supported.

When you take the log of numbers <0, you result is complex. Numbers >0 are not. Comet does not support complex numbers. Consider instead using the magnitude: comet(x,abs(y)) or the real part: comet(x,real(y))