[Q] Up values
- To: mathgroup at christensen.cybernetics.net
- Subject: [mg649] [Q] Up values
- From: kessler at halley.sph.unc.edu (Marc Kessler)
- Date: 6 Apr 1995 03:50:18 GMT
Why isn't the following code giving
(1,0) 2
Out[6]= 4 lami [x, y]
as a result?
$ math
Mathematica 2.2 for VAX/VMS
Copyright 1988-93 Wolfram Research, Inc.
-- Motif graphics initialized --
In[1]:= li = lami[x,y];
In[2]:= lami/: D[lami[x,y],{x,2}] = 0;
In[3]:= lami/: D[lami[x,y],{y,2}] = 0;
In[4]:= lami/: D[lami[x,y],x,y] = 0;
In[5]:= vert = 2li^2 - li;
In[6]:= D[vert,{x,2}]
(1,0) 2 (2,0) (2,0)
Out[6]= 4 lami [x, y] - lami [x, y] + 4 lami[x, y] lami [x, y]
I have the same problem when I use
lami/: D[lami[x_,y_],{x_,2}] = 0; ...
Thanks for the help.
--
================================================================
Marc Kessler
Dept. Environmental Sciences and Engineering Keep on
UNC-Chapel Hill keepin' on
phone # (919)966-1372
E-mail kessler at halley.sph.unc.edu