List Archives >
Maple User Group List Archive >
Archive by date >
This Month By Date >
This Month By Topic
[MUG] Re: Bug VectorCalculus[Jacobian]
| [MUG] Re: Bug VectorCalculus[Jacobian] |
|
Author: Maple User Group
Posted: Tue, 22 Oct 2002 11:43:05 -0400
|
>> From: Maple User Group "maple_gr"
On Thu, 17 Oct 2002 "jarausch" wrote:
|> Maple8 does not compute a Jacobian of a mapping of an
|> m-dimensional space into an n-dimensional one with
|> m different from n, although this is mathematically
|> well defined.
|> > VectorCalculus[Jacobian](fp,[p[1],p[2],p[3]]);
|> Error, (in VectorCalculus:-Jacobian) the number of functions must
|> equal the number of variable names
|> Is there any workaround?
-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-
Date: Sun, 20 Oct 2002 12:46:36 -0700 (PDT)
From: Robert Israel "israel"
To: "maple-list"
Subject: Bug VectorCalculus[Jacobian]
Well, you could simply roll your own:
> MyJacobian:= (F::list, V::list) ->
Matrix([seq([seq(diff(f,v),v=V)], f=F)]);
Or patch VectorCalculus:-Jacobian to remove the line
if lenf <> lenv then error "the number of functions must equal the number
of variable names" end if;
(although there should still be an error if you ask it to compute the
determinant in this case)
Robert Israel "israel"
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia
Vancouver, BC, Canada V6T 1Z2
-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-
Date: Sun, 20 Oct 2002 19:39:30 -0400 (EDT)
From: Carl Devore "devore"
To: "maple-list"
Subject: Bug VectorCalculus[Jacobian]
Yes, this is an oversight. In the small procedure
VectorCalculuc:-Jacobian, the line
if lenf <> lenv then
should be changed to
if computedet and lenf <> lenv then
> Is there any workaround?
Yes,
Matrix(linalg[jacobian](fp, [p[1], p[2], p[3]]));
|
[View Complete Thread]
Previous by date: [MUG] maple and bproc,
Next by date: [MUG] Re: Weird behavior of Maple 6 under XP and NT, Maple User Group
Previous thread: [MUG] Maple and Octave, Brad Camroux
Next thread: [MUG] Weird behavior of Maple 6 under XP and NT, Rafal Ablamowicz
|
(NAG)
