|
[Date Index]
[Thread Index]
[Author Index]
A simple bug..
I seem to have come across this simple and reproducible bug :
The error is in the last line of this post (the others are simply
reproducing my previous steps) where "h" is not being replaced.....
Mathematica 3.0 for NEXTSTEP Intel
Copyright 1988-97 Wolfram Research, Inc.
-- Motif graphics initialized --
In[1]:= phi={
1 - 3 (x/h)^2 + 2 (x/h)^3,
-x(1-x/h)^2,
3(x/h)^2 - 2 (x/h)^3,
-x( (x/h)^2 - (x/h))}
2 3 2 3 2
3 x 2 x x 2 3 x 2 x x x
Out[1]= {1 - ---- + ----, -(x (1 - -) ), ---- - ----, -(x (-(-) + --))}
2 3 h 2 3 h 2
h h h h h
In[2]:= k1[i_,j_]:=
Integrate[
( e in
D[phi[[i]],{x,2}]
D[phi[[j]],{x,2}]
), {x,0,h}] Syntax::newl: The
newline character after " ( e in "
is understood as a multiplication operator.
In[3]:= k1matrix=Table[k1[i,j], {i,4},{j,4}]
12 e in -6 e in -12 e in -6 e in
Out[3]= {{-------, -------, --------, -------},
3 2 3 2
h h h h
-6 e in 4 e in 6 e in 2 e in -12 e in 6 e in 12 e in 6 e in
> {-------, ------, ------, ------}, {--------, ------, -------,
------},
2 h 2 h 3 2 3 2
h h h h h h
-6 e in 2 e in 6 e in 4 e in
> {-------, ------, ------, ------}}
2 h 2 h
h h
In[4]:= k1matrix=Table[k1[i,j], {i,4},{j,4}] /. h->6
e in -(e in) -(e in) -(e in) -(e in) 2 e in e in e in
Out[4]= {{----, -------, -------, -------}, {-------, ------, ----, ----},
18 6 18 6 6 3 6 3
-(e in) e in e in e in -(e in) e in e in 2 e in
> {-------, ----, ----, ----}, {-------, ----, ----, ------}}
18 6 18 6 6 3 6 3
In[5]:= k1matrix=Table[k1[i,j], {i,4},{j,4}] /. e*in -> 10^6
12000000 -6000000 -12000000 -6000000
Out[5]= {{--------, --------, ---------, --------},
3 2 3 2
h h h h
-6000000 4000000 6000000 2000000
> {--------, -------, -------, -------},
2 h 2 h
h h
-12000000 6000000 12000000 6000000
> {---------, -------, --------, -------},
3 2 3 2
h h h h
-6000000 2000000 6000000 4000000
> {--------, -------, -------, -------}}
2 h 2 h
h h
In[6]:= k1matrix=Table[k1[i,j], {i,4},{j,4}] /. {h->6, e*in ->10^6}
12000000 -6000000 -12000000 -6000000
Out[6]= {{--------, --------, ---------, --------},
3 2 3 2
h h h h
-6000000 4000000 6000000 2000000
> {--------, -------, -------, -------},
2 h 2 h
h h
-12000000 6000000 12000000 6000000
> {---------, -------, --------, -------},
3 2 3 2
h h h h
-6000000 2000000 6000000 4000000
> {--------, -------, -------, -------}}
2 h 2 h
h h
In[7]:=
--
Jagannatha Rao E-mail:rao@uh.edu
Associate Professor
Department of Mechanical Engineering Tel :(713) 743-4535 University
of Houston Fax :(713) 743-4503 Houston, TX
77204-4792
Prev by Date:
postscript file
Next by Date:
A bug?
Prev by thread:
Re[2]: postscript file
Next by thread:
RE: A simple bug..
|
