TITLE: Why is wolfram alpha plotting this differently?
QUESTION [6 upvotes]: I have an equation for a cylinder as $x^2+(y-b)^2=a^2$ for some $a$ and $b$.
so I just plugged in $b=2$ and $a=1$ and tried to plot it using wolfram alpha, and the 3D plot looked like half a cylinder, like this.
Why am I not getting a 3D plot for a cylinder instead?

REPLY [3 votes]: Here is a parametrization using Mathematica. As @Patrick Stevens pointed out, you cannot plot this in Wolfram Alpha (yet).