Hi Rouben,
the result actually *is* a sphere - but the coordinate system is skewed
because the axes do not have the same units.
The option 'axis equal' for \begin{axis} will fix it.
Best regards
Christian
Am 24.04.2012 03:58, schrieb Rouben Rostamian:
> Hello Christian,
>
> I have a rather basic question about pgfplots.
> I am trying to plot a sphere, like this:
>
> \documentclass{article}
> \usepackage{pgfplots}
> \begin{document}
> \begin{tikzpicture}
> \begin{axis}[view={60}{30}]
> \addplot3[surf, z buffer=sort, domain=0:180, y domain=0:360]
> ({sin(x)*cos(y)},
> {sin(x)*sin(y)},
> {cos(x)}
> );
> \end{axis}
> \end{tikzpicture}
> \end{document}
>
> The result appears to be an ellipsoid rather than a sphere.
> (I am using pgfplots 1.4.1.) I suspect that I have failed
> to specify an essential parameter. I searched the manual
> but didn't find the necessary information. Would you please
> tell me how to make a sphere that looks like a sphere?
>
> Rouben
>
>
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