RE: Can we plot graphs over really small intervals?
- To: mathgroup at smc.vnet.net
- Subject: [mg18356] RE: [mg18319] Can we plot graphs over really small intervals?
- From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
- Date: Wed, 30 Jun 1999 14:13:24 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Ranko Bojanic wrote:
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I know the function
f[x_] := 10 x^4 + Log[2 - x];
has a zero in the interval [2 - 10^(-69), 2 - 10^(-70)]
but I cannot draw the graph of f over that interval.
Mathematica says that x in {x, 2 - 10^(-69), 2 - 10^(-70)}
must have distinct numerical values.
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You can make a change of variable so your small interval is near the origin.
The line below will make an acceptable plot.
Plot[10*(2 + u)^4 + Log[u], {u, 10^-69, 10^-70}, PlotRange -> All];
If you don't make the change of variable you can't easily label the tick
marks on the horizontal axis even if you did get a graphic.
Regards,
Ted Ersek