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rcolistete DEVELOPER
Joined: 11 May 2003
Posts: 74
Thanks received: 11 in 10 posts Thanks given: 3
Location: Brazil Phone: Nokia N9, Nokia N900, Nokia N810, was N95, E63, 9500, NGage, 9290, 7650

Posted: Tuesday, 01.Nov.2011 18:19 Post subject: Limit  calculating mathematical limits 



"Limit" is an easy to use free and opensource application to calculate mathematical limits with many features :
* symbolical and numerical calculation with arbitrary number of digits;
* 5 simplification methods for nonnumerical results;
* option to show the calculation time;
* option to show the not calculated limit before the result;
* result with zoom levels and different colors;
* 7 output types : simple, bidimensional, typesetting, LaTeX, MathML, C and Fortran;
* copy&paste available in all entry fields and also in the result, allowing copying the result to anywhere;
* history and line completion editing in the expression.
See the Limit web site.
"Limit" runs on Maemo 4 (Nokia N800/N810, etc), Maemo 5 (Nokia N900) or any smartphone/tablet/computer where Python, SymPy and PyQt are available. Future versions will use PySide and QML.
SymPy is a computer algebra system (CAS) written in pure Python, it is free and open source project, see SymPy.org. SymPy last version (0.7.1, July 2011) is available for Maemo 4 (Diablo) and Maemo 5 (Fremantle). Look at SymPy topic in MyMaemo forum.
(23/10/2011)
Limit v1.0.0 is available for Maemo 5 (Fremantle) in the extras repository :
* 1st public release for Maemo 4 Diablo and Maemo 5 Fremantle on extrasdevel/extrastesting/extras repository;
* using SymPy 0.7.1 (07/2011);
* time to load is approx. 15 seconds on Nokia N810 and 6 seconds on Nokia N900 @ 600 MHz.
Python, PyQt and SymPy will also be installed if not installed before.
"Limit" is small (42 KB) but it installs "SymPy" (about 18.5 MB after install, with .pyc compiled Python files). "Limit" and "SymPy" are optified on Maemo 5.
For Maemo 5 users, please help promote "Limit" (v1.0.0 promoted in 23/11/2011) to extras repository by voting in :
Limit 1.0.01fremantle1
See also "Integral" and "Derivative", which calculate mathematical integrals and derivatives :
Integral topic in MyMaemo forum
Integral in MyMaemo Software Catalog.
Derivative topic in MyMaemo forum
Derivative in MyMaemo Software Catalog.
Last edited by rcolistete on Thursday, 24.Nov.2011 03:39; edited 1 time in total 

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rcolistete DEVELOPER
Joined: 11 May 2003
Posts: 74
Thanks received: 11 in 10 posts Thanks given: 3
Location: Brazil Phone: Nokia N9, Nokia N900, Nokia N810, was N95, E63, 9500, NGage, 9290, 7650

Posted: Saturday, 12.Nov.2011 16:37 Post subject: 



"Limit" calculates the bilateral limit but SymPy does just limit from the left or right. So for bilateral limit, limit from both directions are calculated and compared, if equal the bilateral limit exists or else does not exist. So this explain the bilateral limit calculation takes more time (i.e., double) than from the left or right.
SymPy sintax for limit of 1/x when x approaches 0 from the right (default direction) :
>>> limit(1/x,x,0)
>>> limit(1/x,x,0,dir='+')
which is infinity. From the left :
>>> limit(1/x,x,0,dir='')
yields  infinity.
Using SymPy directly is useful when a sequence of calculations is needed. Because "Limit" is restricted to just calculate limits with many simplify, output, etc, options.


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rcolistete DEVELOPER
Joined: 11 May 2003
Posts: 74
Thanks received: 11 in 10 posts Thanks given: 3
Location: Brazil Phone: Nokia N9, Nokia N900, Nokia N810, was N95, E63, 9500, NGage, 9290, 7650

Posted: Thursday, 24.Nov.2011 03:40 Post subject: 



Limit is now promoted to extras repository, thanks for the votes.


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