PDE Notation options (one works the other does not)
- To: mathgroup at smc.vnet.net
- Subject: [mg51336] PDE Notation options (one works the other does not)
- From: "Prince-Wright, Robert G SEPCO" <robert.prince-wright at shell.com>
- Date: Thu, 14 Oct 2004 06:37:45 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
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
- Follow-Ups:
- Re: PDE Notation options (one works the other does not)
- From: DrBob <drbob@bigfoot.com>
- Re: PDE Notation options (one works the other does not)