How to plot the following function?

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Reema Noor
Reema Noor 2023-10-7
评论： Walter Roberson 2023-10-7
  5 个评论
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Sam Chak
Sam Chak 2023-10-7
@Reema Noor, Refer to the provided example, then follow the code and plot some of the functions. Copy and paste the code by clicking the icon , then hit the 'Play' icon . If coded correctly, it should generate a plot.
Walter Roberson
Walter Roberson 2023-10-7
Reminder:
Octave is a different product, not made by Mathworks.
The purpose of Octave, the reason it exists at all, is to force Mathworks to either go out of business or to force Mathworks to open-source everything about its software products.
The Free Software Foundation exists for explicitly political purposes -- to attempt to force an end to proprietary software.
It is thus inappropriate to ask for assistance with Octave here. If you want assistance with Octave, find another support resource.

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回答（1 个）

Sam Chak
Sam Chak 2023-10-7
  2 个评论
Sam Chak
Sam Chak 2023-10-7
See also:
https://docs.octave.org/latest/Simple-Examples.html
https://docs.octave.org/v8.3.0/Two_002dDimensional-Plots.html
By the way, I remember that my math teacher taught that the logarithm function is defined only for positive real numbers. But the question tells you to plot from x = -10 to x = 12. Can you really take the logarithm of a negative number? Sure this is not a typo, like positive "+10"?
John D'Errico
John D'Errico 2023-10-7
编辑：John D'Errico 2023-10-7
Ran in:
@Sam Chak
Not really true. The log function will return real results for positive real numbers. However, it is valid to extend that definition to the entire real line, and to the complex plane.
MATLAB can compute the log of negative numbers (the log will be imaginary), or of complex numbers. They will be complex in the latter case.
log(-1)
ans = 0.0000 + 3.1416i
log(1+3i)
ans = 1.1513 + 1.2490i
And those logs make sense in mathematics.

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