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MathGroup Archive 2004

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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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