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MathGroup Archive 1997

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Plot bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg6363] [mg6363] [mg6354] Plot bug?
  • From: bmiller at illigal.ge.uiuc.edu (Brad Miller)
  • Date: Fri, 14 Mar 1997 14:53:43 -0500 (EST)
  • Organization: University of Illinois at Urbana
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
	I am running the new version of mathematica (3.0), and some
code that worked under the old version (2.x?) is not working.

pseudo-mathematica session
*****************************************************
1> Needs["Statistics`ContinuousDistributions`"]

2> PopRatio[pratio_]:=	
	Module[{p}, p=CDF[NormalDistribution[0,1],pratio];
	- 2 pratio / Ln[(1-p)/p]
	]

3> Plot[PopRatio[x],{x,.000001,.7}]

Errors: "Plot::plnr : PopRatio[pratio] is not a machine-size real
           number at pratio = 0.0283978535340494791"
  and many other points also say not a machine-size real number
*****************************************************


Doing a PopRatio[0.0283978535340494791] on the reported bad number
produces the correct PopRatio return value - it does not blow up.  So,
I'm surmising the problem is in the Plot cmd?

This exact fn worked in mathematica 2.x - result should be a plot from
around 1.26 to 1.2 - there are no discontinuities in the plot.

Any suggestions on how to get PopRatio to plot correctly?


thanks,
Brad

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Brad L. Miller                                                         %
% University of Illinois at Urbana-Champaign                             %
% ph:  (217) 333-2346    email: bmiller at uiuc.edu                         %
% fax: (217) 244-5705    web:   http://www-illigal.ge.uiuc.edu/~bmiller  %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



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