Re: plotting even function

[John B. Thoo]

On Mar 20, 2005, at 1:25 PM, John B. Thoo wrote:

> So, if you would allow me at least one more daft question, how do I 
> tell Octave to use the real root so that the plot of  y = x^(1/3)  is 
> symmetrical about the origin?

OK, this is how I've done it.

> x1 = -1:0.1:0; x2 = 0:0.1:1;
> plot (x1, -(-x1).^(1/3), x2, x2.^(1/3))  % odd symmetry
> plot (x1, (-x1).^(2/3), x2, x2.^(2/3))   % even symmetry

But is there a more elegant way?

TIA again.
---John.



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