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Re: PDE Notation options (one works the other does not)
*To*: mathgroup at smc.vnet.net
*Subject*: [mg51387] Re: [mg51336] PDE Notation options (one works the other does not)
*From*: DrBob <drbob at bigfoot.com>
*Date*: Fri, 15 Oct 2004 02:48:17 -0400 (EDT)
*References*: <200410141037.GAA14982@smc.vnet.net>
*Reply-to*: drbob at bigfoot.com
*Sender*: owner-wri-mathgroup at wolfram.com
Must you paste unreadable junk into e-mail? I can't paste it back into Mathematica without errors.
I recommend the "Copy as InputForm" palette:
http://eclecticdreams.net/DrBob/copy_as_inputform.htm
Bobby
On Thu, 14 Oct 2004 06:37:45 -0400 (EDT), Prince-Wright, Robert G SEPCO <robert.prince-wright at shell.com> wrote:
>
> Hello Group.
>
> Can someone explain why 'format 1' below works but 'format 2' does not.
> Also how do you know when to use the different Notations for partial
> derivatives.
>
> thanks
> Bob
>
> ===== format 1
>
>
>
> \!\(\*
> RowBox[{"solution", "=",
> RowBox[{"u", "/.",
> RowBox[{"First", "[", "\[IndentingNewLine]",
> RowBox[{"NDSolve", "[", "\[IndentingNewLine]",
> RowBox[{
> RowBox[{"{", "\[IndentingNewLine]",
> RowBox[{\(?\_t u[x, t] == \(-0.1\)\ \
> u[x, t] - 2\ ?\_x u[x, t] + \ 0.3\ \ ?\_{x, 2}u[x, t]\), ",",
> "\[IndentingNewLine]", \(u[x, 0] == 0\), ",",
> "\[IndentingNewLine]", \(u[0,
> t] == 5\ \((1 - Exp[\(-t\)])\)\), ",", =
> "\[IndentingNewLine]",
> RowBox[{
> RowBox[{
> SuperscriptBox["u",
> TagBox[\((1, 0)\),
> Derivative],
> MultilineFunction->None], "[", \(20, t\),
> \
> "]"}], "==", "0"}]}], "\[IndentingNewLine]", "}"}], ",",
> "\[IndentingNewLine]", "u", ",", \({x, 0, 20}\), ",",
> \({
> t, 0, 10}\)}], "]"}], "]"}]}]}]\)
>
> ===== format 2
>
>
>
> \!\(solution = u /.
> First[\[IndentingNewLine]NDSolve[\[IndentingNewLine]{\
> \[IndentingNewLine]?\_t u[x, t] == \(-0.1\)\ \ u[x, t] - 2\ ?\_x
> u[x,
> t] + \ 0.3\ \ ?\_{x, 2}u[x,
> t], \[IndentingNewLine]u[x, 0] ==
> 0, \[IndentingNewLine]u[0, t] == 5\ \((1 -
> Exp[\(-
> t\)])\), \[IndentingNewLine]?\_x\ u[20, t] ==
> 0\[IndentingNewLine]}, \[IndentingNewLine]u, {x, 0,
> 20}, {t,
> 0, 10}]]\)
>
>
> Robert Prince-Wright
> Risk Management Engineer, EP Americas
> Shell Exploration & Production Company
> One Shell Square
> P. O. Box 61933
> New Orleans
> LA 70161-1933
> United States of America
>
> Tel: +1 504 728 7720
> Fax: +1 504 728 4573
> Email: robert.prince-wright at shell.com
> Internet: http://www.shell.com
>
>
>
>
>
>
--
DrBob at bigfoot.com
www.eclecticdreams.net
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