Home Page of Dennis J. Darland's Software Projects

Email: dennis.darland@yahoo.com

Comments welcome.

For other things I'm doing see my home page.

Computer Languages I have available to me.

MY SOFTWARE PROJECTS

Recent Work

1. 10/29/2009 Installed xwindows under cygwin - Seems to work
2. 11/3/2009 Installed Polyml, Isabelle and ProofGeneral under cygwin - Seems to work
3. 12/29/2010 Got 2nd Laptop for development work. The various problems I had had (causing me e.g. to have to reinstall and restore data) had stopped since I had not been doing development. I am keeping regular data on the old laptop and development on the new one.
4. 2/3/2010 Copied RubySode and MapleSode to new laptop
5. 2/3/2010> RubysSde and APFP (Arbitrary Precision Floating Point) seem functional.
6. 2/3/2010 Start development of regression test for APFP (Ruby program to generate a Ruby Program to generate a Maple Program to compare answers.
7. 2/5/2010 Test program for APFP almost finished.
   
8. 2/6/2010 Test program basically finished - tests ran OK on sin, cos and tan.
   
9. 2/7/2010 Tested all functions - fixed some problems - log, log10 and sqrt not as accurate as desired.
   sinh and tanh also had one problem.
   The Ruby Program to generate a Ruby program to generate a Maple test program
   The generated Ruby program to generate a Maple test program
   The generated Maple test program
   Test Results - Just all functions
   Test Results EXCEPTIONS - all functions
   Ap.rb
   ApConfig.rb
   Apc.rb
   Apfp.rb
   Real.rb
   
10. Work in Ruby (and Maple 12). Ruby progran to generate Maple program to Solve a differential equation
    • Creating new Ruby version (of SODE) to generate Maple 12 code.
      
    • Maple now has tolerances like my error estimation - but I ran into trouble trying to do comparison operations. I haven't pursued that yet.
      
    • If anyone wants the source code - email me at dennis.darland@yahoo.com.
    • My Ruby arbitrary precision too slow to worry about
      
    • Taylor Series Theory
    • 8/9/2008 Basic Funtionallity Converted
      
    • Now (9/15/2008) limited to one equation
      
    • New (9/17/2008) Revised to iterate on multiple equations(more remarks below)
      
    • New (2/21/2009) Fixed problem with constants with over 1 digit after decimal point.(MapleSode02.zip)
      
    • New (2/22/2009) Added nonlinear01.ode (in MapleSode03.tar.gz) - too complicated to solve - get memory error)
      
    • Functions Debugged
    1. 9/19/2008 sin test -> sin result
    2. 9/19/2008 cos test -> cos result
    3. 9/19/2008 addition test -> addition result
    4. 9/19/2008 subtraction test -> subtraction result
    5. 9/19/2008 multiplication test -> multiplication result
    6. 9/19/2008 division test -> division result
    7. 9/19/2008 arccos test -> arccos result
    8. 9/19/2008 arcsin test -> arcsin result
    9. 9/19/2008 arctan test -> arctan result
    10. 9/19/2008 cosh test -> cosh result
    11. 9/19/2008 sinh test -> sinh result
    12. 9/19/2008 tanh test -> tanh result
    13. 9/19/2008 exp test -> exp result
    14. 9/19/2008 ln test -> ln result
    15. 9/19/2008 Real Singularity test -> Real Singularity result
    16. 9/19/2008 Complex Singularity test -> Complex Singularity result
    17. 9/19/2008 Higher Order Equation (implicit exp) test -> Higher Order Equation result
    18. 9/19/2008 Higher Order Equation (implicit sin) test -> Higher Order Equation result
    19. 9/19/2008 Higher Order Equation (implicit cos) test -> Higher Order Equation result
    20. 9/19/2008 Multiple Complicated Equations test -> Multiple Complicated Equations result
    21. 9/19/2008 erf test -> erf result
    22. 9/19/2008 Si test -> Si result
    23. 9/19/2008 tan test -> tan result
    • Functions to test
    1. sin5.ode
    2. sing2.ode
    3. sing3.ode
    • I've realized (9/14/2008) much more work required for systems of equations.
    • Note for systems of equations, the program tried to determine an order for them
    • But I think all OK for one equation - which I have now restriicted MapleSode.rb to.
    • But if two equations each involve terms from the other (mutual dependance) this may not be possible
    • For systems of linear equations (and some others) the mutual dependance can be eliminated
    • The program will work fine, as far as I know, for single equations
      
    • I am curremntly reviewing Calculus, with Differential equations, Linear Algebra, and Partial Differential equations coming later.(Most of this I studied in school over 35 years ago, and I did not really understand its significance then). As I'm reviewing this, I find I have a much greater appreciation of its significance.
    • Fortunately, I have Maple 12, which is a great study aid.
    • I've revised (9/17/2008) MapleSode.rb to, in the case of more than one equation, to (sub-)iterate on the caclulation (atomall) till either the solution stablize oe a maximum number of (sub-)iterations (which can be modified) is reached.
    • I don't know how to know if it will eventually stablize; I doubt if it, in general, is possible to tell.
    • My tests so far are in 'complicated' tests above
    • 9/19/2008 tan, erf and Si added and Code cleaned up
11. Work in Ruby.
    • I have incorporated the most important fix from MapleSode into RubySode (sub-iteration for multiple equations)- it is now in the ftp area here. The version on SourceForge is obsolete - I had trouble updating the SourceForge Site due to their changes. As I now have this site (dennisdarland.com) , it is not good to try to maintain two sites anyway.
    • I have converted the next project to the more popular language from unicon. RubyApfp13.tgz are alpha released on sourceforge.net. (It is not yet beta released - I have not yet found a beta tester! But I hxave had no complaints either. The Ruby versions now the current versions.)
      Ruby classes for arbitrary precision floating point(with upper estimate for accumulated error).
      APFP Project Home Page
      
    • Work in Ruby on Rails.

      I have (5/2/2009) got the complex calculator below working again, but have not tested it thoroughly.

      I have (5/327/2009) fixed the real calculator as well.
      Both need testing
    • My Handy Calculators (NOTE: these are not even beta released yet - I have not been able to find a beta tester!) They were written with Rails. They were written mostly to facilitate testing of APFP above.
      
      • About Ruby on Rails.
        
      • How it works!
        

        NOTE: These Calculators have not yet been tested thoroughly.

        There is no Guarantee or Warranty that they work correctly.

        Do not use them for anything important! They are intended for researching the correctness of my APFP library.
        
      • My real calculator
        
      • My complex calculator
        
    • I have started to write a Rails Web application for a Book database for practice using Rails with a database. I do not expect to accually use it, as I like "Book Collector", but I had actually started on it first.
      
12. Work in Maple.
    Maple program to symbolically evaluate Einstein's law of gravity (general relativity). Result included in text file. (You don't need Maple.) NOTE: (5/22/2009) After watching Leonard Susskind's fifth lecture on General Relativity, I think that this code contains errors in covarient derivatives. Also I have come to realize Maple (as far as I know how to use it) does not do well in simplifying complicated expressions.
    Gravity Documentation
    Gravity source code
    

    Anonymous FTP to get source code

    Anonymous Download Page NOTE: I have used Windows, Linux and cygwin. Most of this code will work in any of them. The main problem being end of line characters, which I fix, ad hoc, when switching OSs.
    
    You may also download the source to the java pinball game here. Or Life.tgz - a lanuage similar to Prolog - Based on Wildlife-1.02. Originally I converted it from Unix to OS/2. Then (being unable to find the Unix code) converted it to Linux. I cannot get it to work with cygwin. It isn't a polished distribution - I just thought I would give what I had done as I don't know when I will have time to improve it. I do have a 'pitch' card game working written using it.
    
13. Work in C.
    Life.tgz - a lanuage similar to Prolog - Based on Wildlife-1.02. Originally I converted it from Unix to OS/2. Then (being unable to find the Unix code) converted it to Linux. I cannot get it to work with cygwin. It isn't a polished distribution - I just thought I would give what I had done as I don't know when I will have time to improve it. I do have a 'pitch' card game working written using it.You can download it at the ftp link above.
    Life Documentation
    
14. Work in Java.
    Java Quantum Mechanical Pinball Game.
    You can download the source at the ftp link above.
    I studied to code some again - I am not certain that it is quantum mechanically correct - but I think it has that sort of effect.
    
    Pinball Help Pinball Documentation
    Applet Here! Revised Java Quantum Pinball

15. MY FAVORITE OPEN SOURCE SOFTWARE

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