[clisp-list] clisp and gclisp give different answer for the same problem, not related to texmacs/maxima interface

[Javed A. <ja...@cc...>]

David

Thanks for the tips both of the approaches suggested by you worked in 
getting
maxima{compiled with clisp}  shell to open up in texmacs 
{winxp/win200/cygwin/}. However, that is not the end
of my problems. I tried to solve this 2nd order differential equation 
and end up with
a wrong answer because if I try doing the same with maxima compiled with 
GCL I get the
right answer. Did some body else had the same problem?



$ maxima
  i i i i i i i       ooooo    o        ooooooo   ooooo   ooooo
  I I I I I I I      8     8   8           8     8     o  8    8
  I  \ `+' /  I      8         8           8     8        8    8
   \  `-+-'  /       8         8           8      ooooo   8oooo
    `-__|__-'        8         8           8           8  8
        |            8     o   8           8     o     8  8
  ------+------       ooooo    8oooooo  ooo8ooo   ooooo   8

Copyright (c) Bruno Haible, Michael Stoll 1992, 1993
Copyright (c) Bruno Haible, Marcus Daniels 1994-1997
Copyright (c) Bruno Haible, Pierpaolo Bernardi, Sam Steingold 1998
Copyright (c) Bruno Haible, Sam Steingold 1999-2003

Maxima 5.9.0 http://maxima.sourceforge.net
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
;; Loading file /usr/local/share/maxima/5.9.0/share/maxima-init.lisp ...
;; Loaded file /usr/local/share/maxima/5.9.0/share/maxima-init.lisp
(C1) 'diff(x,t,2) + a*x = b*sin(c*t);
                             2
                            d x
(D1)                        --- + a x = b SIN(c t)
                              2
                            dt
(C2) ode2(d1,x,t);
Is  a  positive, negative, or zero?

positive;
                          /
                          [
(D2) x = b SIN(SQRT(a) t) I (SIN(c t + SQRT(a) t) + SIN(c t - SQRT(a) t))
                          ]
1. Break [1]>

                    d
/(2 COS(SQRT(a) t) (-- (SIN(SQRT(a) t)))
                    dt

                     d
 - 2 SIN(SQRT(a) t) (-- (COS(SQRT(a) t)))) dt
                     dt

                    /
                    [
 + b COS(SQRT(a) t) I (COS(c t + SQRT(a) t) - COS(c t - SQRT(a) t))
                    ]
                    /

                    d
/(2 COS(SQRT(a) t) (-- (SIN(SQRT(a) t)))
                    dt

                     d
 - 2 SIN(SQRT(a) t) (-- (COS(SQRT(a) t)))) dt + %K1 SIN(SQRT(a) t)
                     dt

 + %K2 COS(SQRT(a) t)




Same solution using maxima compiled under gclisp


C:\Program Files\Maxima-5.9.0\lib\maxima\5.9.0\binary-gcl>maxima -eval
n)
GCL (GNU Common Lisp)  Version(2.5.0) Thu Jan 30 02:37:51 CST 2003
Licensed under GNU Library General Public License
Contains Enhancements by W. Schelter

Use (help) to get some basic information on how to use GCL.
Maxima 5.9.0 http://maxima.sourceforge.net
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
                 
(C3) 'diff(x,t,2) + a*x= b*sin(c*t);

                             2
                            d x
(D3)                        --- + a x = b SIN(C t)
                              2
                            dt
(C4) ode2(d3,x,t);

Is  a  positive, negative, or zero?

positive;
                b SIN(C t)
(D4)      x = - ---------- + %K1 SIN(SQRT(a) t) + %K2 COS(SQRT(a) t)
                   2
                  C  - a
(C5)

The two solutions are totally different. This has to do with the CLISP 
and GCLISP compilers. Any help or suggestions in this regard
will be highly appreciated.

regards

javed




Billinghurst, David (CALCRTS) wrote:

>>From: Billinghurst, David (CALCRTS) 
>>
>>    
>>
>>>From: Javed Alam
>>>Sent: Saturday, 13 September 2003 12:02 AM
>>>
>>>I have been trying to run texmacs-1.0.1.21 with maxima-5.9.0 under 
>>>cygwin on a win/xp and win/2000 system.
>>>
>>>[...]
>>>
>>>I get the following error.
>>>
>>>[...]
>>>
>>>Fatal error: bad url in 'complete'
>>>See file   : url.cpp
>>>      
>>>
>>See if https://savannah.gnu.org/bugs/?func=detailbug&group_id=156&bug_id=4241
>>helps.  It suggests hard coding a file location. I will have a look 
>>myself over weekend.
>>    
>>
>
>Alternatively:
>http://www.mail-archive.com/fin...@li.../msg09820.html
>indicates that the problem is related to locate/updatedb.  
>
>When "locate toc_maxima.html" finds the file then texmacs will run maxima.  
>However, I have some unresolved issues on cygwin:
> - the machine that used to work now doesn't, 
> - the one that didn't now does after doing an updatedb
> - updatedb is giving me some grief.
>
>
>  
>


-- 

*Javed Alam, *Ph.D.

*Professor*

*Civil/Environmental/Chemical Engineering Department*

Youngstown State University

Youngstown, Ohio 44555

Phone 330-941-3029

Fax     330-941-3265

e-mail ja...@cc... <mailto:ja...@cc...>

web: http://www.eng.ysu.edu/~jalam/ <http://www.eng.ysu.edu/%7Ejalam/>

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