       Re: Problem with RegionFunction

• To: mathgroup at smc.vnet.net
• Subject: [mg88051] Re: Problem with RegionFunction
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Wed, 23 Apr 2008 04:07:03 -0400 (EDT)
• Organization: Uni Leipzig
• References: <fukern\$s4l\$1@smc.vnet.net>

```Hi,

try

Manipulate[
Plot3D[Sin[x]*Cos[y], {x, 1, 10}, {y, 2, 10},
RegionFunction -> Function[{x, y}, 45 <= (y^x)],
Exclusions -> x == 0], {dummy, {True, False}}]

because y^x for x==0 and y==0 is undefined.

Regards
Jens

zac wrote:
> Dear Group,
>
> any idea what is the problem with the output of this Manipulate?
>
> Manipulate[
> Plot3D[Sin[x]*Cos[y],{x,1,10},{y,2,10},RegionFunction->Function[{x,y},
> 45<=(y^x)]]
> ,{dummy,{True,False}}]
>
> Interestingly none of the following codes produces errors:
>
> Plot3D[Sin[x]*Cos[y], {x, 1, 10}, {y, 1, 10},
>  RegionFunction -> Function[{x, y}, 45 <= (y^x)]]
>
> Manipulate[
>  Plot3D[Sin[x]*Cos[y], {x, 1, 10}, {y, 1, 10},
>   RegionFunction -> If[region, All, Function[{x, y}, 45 <= (y^x)]]]
>  , {region, {True, False}}]
>
> Any suggestion would be appreciated.