Interactive Plot with a Variable
Two psplots coupled to a draggable uservariable with custom scaling.
This diagram is interactive — use your mouse or touch to play with it.
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Source
\psset{unit=0.75cm}
\begin{pspicture}(-4,-3)(4,6)
\uservariable{alpha}(0.1,0){x}
\psplot[algebraic,linewidth=2pt]{-4}{4}{pow(x,2)}
\psplot[algebraic,linecolor=blue,linewidth=3]{-4}{4}{4*(x-alpha)*alpha}
\psline{->}(-4,0)(4,0)
\end{pspicture}