Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Gaps in plotted graph, probably resulting from real values being miscomputed as complex

• To: mathgroup at smc.vnet.net
• Subject: [mg123454] Gaps in plotted graph, probably resulting from real values being miscomputed as complex
• From: jdm <james.d.mclaughlin at gmail.com>
• Date: Thu, 8 Dec 2011 05:22:23 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Plot[Log[2,
  PDF[NormalDistribution[0, 1],
    InverseCDF[NormalDistribution[0, 1], (1 - 2^(-x))]]^2], {x, 1,
  256}, PlotRange -> {-500, 0}]

plots up to about x=56, and then nothing.

Based on similar behaviour under another system, I suspect that some sort of
calculation error as 1 - 2^(-x) approaches 1 is causing some of the
values that should be plotted to be wrongly computed as complex
numbers, but have no way of confirming this and don't understand why
the real-valued values aren't being plotted for their corresponding x
if this is the case.

Can anyone suggest anything?

Thanks,

James McLaughlin.

• Follow-Ups:
  • Re: Gaps in plotted graph, probably resulting from real values being miscomputed as complex
    • From: Heike Gramberg <heike.gramberg@gmail.com>