[Maxima-bugs] [ maxima-Bugs-2927429 ] Simplification of units do not work always

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Bugs item #2927429, was opened at 2010-01-07 10:39
Message generated for change (Settings changed) made by riotorto
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Category: Tests
Group: None
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: Stas (newhippie)
Assigned to: Nobody/Anonymous (nobody)
Summary: Simplification of units do not work always

Initial Comment:
Hi,

I am using maxima 5.9.2.

wihile using the "unit" package it is not possible to do som operations. For example:
(i1) load(unit);
(o1) ...
(i2) a:2*Hz/3*s;
(o2) 2/3
(i3) sqrt(a);
(o3) CLIENT: Lost socket connection ...
Restart Maxima with 'Maxima->Restart Maxima'.

It is a general behaviour when unsing to different dimensions, which are normaly simplifyed to 1. The same thing happens by cm/m of kg/g.

Is there a way to tell maxima to use only the number of an variable and not the units?

The bad thing is, that the standard mathematical opperations are possible: in the example before it could be: a+a or a*a ...

The error happens by sqrt and ^. I have not tested other things yet.

Someone an idea?

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Comment By: Stas (newhippie)
Date: 2010-01-07 19:15

Message:
Oh, sorry. I mean 5.19.2.

In fact, I'm now using ezunits.

Thanks to you.

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Comment By: Mario Rodriguez Riotorto (riotorto)
Date: 2010-01-07 13:07

Message:
Hello,

You are using a very old version of Maxima; I suggest you update it.

In any case, I think package units is no longer maintained, but you can
use package ezunits instead:


Maxima 5.20post http://maxima.sourceforge.net
using Lisp CLISP 2.44.1 (2008-02-23)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) display2d : false $
(%i2) load(ezunits) $
(%i3) a:2/3 `Hz/s;
(%o3) 2/3 ` Hz/s
(%i4) b : sqrt(a);
(%o4) sqrt(2)/sqrt(3) ` sqrt(Hz)/sqrt(s)
(%i5) b ``fundamental_units(b);
0 errors, 0 warnings
ezunits: computing conversions to base units; may take a moment. 
(%o5) sqrt(2)/sqrt(3) ` 1/s

--
Mario

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