       Re: Plot3D crashes Mathematica 6.02

• To: mathgroup at smc.vnet.net
• Subject: [mg89195] Re: Plot3D crashes Mathematica 6.02
• From: "David Park" <djmpark at comcast.net>
• Date: Thu, 29 May 2008 07:02:35 -0400 (EDT)
• References: <g1j6bv\$ql7\$1@smc.vnet.net>

```When I evaluate

Plot3D[(10 (x - y))/((x^2 + y^2 + 1) E^-((x - y)^2 + (x + y)^2)), {x, -10,
10}, {y, -10, 10}]

in Version 6.0.2 on 32-bit Windows Vista I don't obtain any error messages,
nor do I get a very interesting plot.

If the function represents anything physical it would be interesting to know
what it is and what the important features are. It is something of a
challenge to attempt to graphically represent the function because the
exponential factor is so dominant. It is the type of plot that might require
multiple images. Near the origin the function is just a simple slanted
plane.

Plot3D[(10 (x - y))/((x^2 + y^2 + 1) E^-((x - y)^2 + (x + y)^2)), {x, -.1,
..1}, {y, -.1, .1},
PlotRange -> All]

Series[(10 (x - y))/((x^2 + y^2 + 1) E^-((x - y)^2 + (x + y)^2)), {x,
0, 1}, {y, 0, 1}] // Normal
10 x - 10 y

and this is all multiplied by a scaling factor, plotted in Log form:

ContourPlot[
Log[10, 1/((x^2 + y^2 + 1) E^-((x - y)^2 + (x + y)^2))], {x, -10, 10},
{y, -10, 10},
PlotRange -> All]

--
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/

"prokofyev" <alexander.prokofyev at gmail.com> wrote in message
news:g1j6bv\$ql7\$1 at smc.vnet.net...
> Mathematica 6.0.2.0 crashes on Intel Pentium 4, 3200 MHz, Asus P4P800-
> VM, RAM 2 Gb computer running Windows Server 2003 R2 when trying to
> execute
>
> Plot3D[10(x-y)/(x^2+y^2+1)/E^-((x-y)^2+(x+y)^2), {x, -10, 10}, {y,
> -10, 10}]
>
> with Application Error "The memory could not be "read".
>