Re: PlotRange Trouble

*To*: mathgroup at smc.vnet.net*Subject*: [mg90442] Re: PlotRange Trouble*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Wed, 9 Jul 2008 04:55:59 -0400 (EDT)

On 7/8/08 at 7:47 AM, aaronfude at gmail.com (Aaron Fude) wrote: >I may be wondering why I need this, but I do: >ParametricPlot[{10^-600 z, z}, {z, 0, 100}, >PlotRange -> {{0, 10^-100}, {0, 100}}, AspectRatio -> 1] >works perfectly, but >ParametricPlot[{10^-600 z, z}, {z, 0, 100}, >PlotRange -> {{0, 10^-600}, {0, 100}}, AspectRatio -> 1] >fails. What gives? Aside from possibly trying to find something to make Mathematica have problems, what possible reason could you have for making either of these plots? With the values you have chosen the example that does work in the sense no error messages are generated results in a plot that is indistinguishable from ParametricPlot[{0, z}, {z, 0, 100}, PlotRange -> {{0, 10^-100}, {0, 100}}, AspectRatio -> 1] My guess as to the reason for the error message in the second example likely has to do with fact the maximum value for the plot range is given as an exact number that is essentially indistinguishable from 0 when converted to a machine precision number. But I frankly do not care if my guess is correct or not. The bottom line is you are not doing anything useful here. So, I cannot see anyone doing useful work with Mathematica could ever encounter this.