It is simply joining the points. The plot is actually correct. Attached is 
the output of 

plot(sqrt(2*x^2-3)/(5*x-2), (x,-10,10),ymin=-5,ymax=5,marker='*')

which shows that there are no points in the imaginary range.


On Wednesday, March 21, 2012 11:13:37 AM UTC+8, Dan Drake wrote:
>
> plot(sqrt(2*x^2-3)/(5*x-2), (x,-10,10),ymin=-5,ymax=5)
>
> merrily plots points when the numerator is imaginary:
>
>
> http://aleph.sagemath.org/?z=eJwryMkv0SguLCrRMNKqiDPSNdbU1zDVqtA10tRR0KjQ0TU00DE00NSpzM3Ms9U1BdKJFbammgCoDQ7n
>
> I don't mind that it complains about failing to evaluate the function,
> but the plot is totally wrong. I want something more like:
>
> http://www.google.com/#q=sqrt(2*x%5E2-3)/(5*x-2)
>
>
> Dan
>
> --
> ---  Dan Drake
> -----  http://mathsci.kaist.ac.kr/~drake
> -------
>

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