Evgenii B. Rudnyi

Home | Teaching | Programming | Publications |

Code Name |
Description |
Language |
Compiles with gcc 3.3 |
Required libraries (not included) |

ruscga | Converting Cyrillic letters on CGA | Assembler | n/a | |

msd | Second and Third Law treatment of mass spectrometry data | Fortran | yes | |

eqconst | Simultaneous treatment of equilibrium constants | Fortran | yes | Lapack or old Fortran IMSL |

kcl | Vaporization thermodynamics of KCl (variance component analysis) | Fortran | yes | old Fortran IMSL |

plasma | Computing equilibrium composition in air plasma | Fortran | yes | VCS from Smith's book |

task | Generating problem sets for students | C++ | no | |

varcomp | Variance component analysis under linear error model | C++ | yes | old Fortran IMSL |

bacuy_eq | Computing phase diagram of Ba-Cu-Y | C++ | yes | DONLP2 |

sid2user, user2sid | Usefull NT utilities for a hacker | C++ | no | Win32 API |

species | A class of chemical species | C++ | no | |

tdlib | Computational chemical thermodynamics | C++ | yes | |

mor4ansys | Model order reduction for ANSYS models | C++ | yes | |

Post4MOR | Postprocessing model reduction results | Mathematica, Python | n/a | |

quadpack | Mathematica quadpack interface | C++, Mathematica | yes for C++ part | |

ANSYSRecords, ANSYSEmat | Reading ANSYS binary files from Mathematica | C++, Mathematica | yes for C++ part | ANSYS bin |

slicot | Mathematica Slicot interface | C++, Mathematica | yes for C++ part | SLICOT |

webbook | Web book about NT | VBScript, ASP | n/a | text by itself |

pyros | Micropyros software | webMathematica | n/a | ANSYS scripts |

R-Cite | Bibliography software under Paradox | PAL: Paradox Application Language | n/a |

I started programming when I was a student. I was in the 13th group at Chemistry Department of Moscow State University. Traditionally this group specialized in computing in chemistry. Many thanks to M. G. Anashkin who was responsible for our group. He has made a lot to give us the best access to computational resources that have been available at that time.

I started with MIR-2 and then from 1979 to 1988 was working on BESM-6. A cool
thing. I worked from a terminal although occasionally I even used punch
cards. I had about 6 Kb of space on my student account and hence needed to
keep my program at the tape. In order to edit a program on the tape it was
necessary to write a special editing job. `ed`

-like editing, not
speaking of `vi`

, was a dream.

In 80th, we also had Elektronika D3-28 (at the middle of the linked page) at the lab. It was possible to enter assembler from a keyboard and then to save the code to the tape. Since the middle of 80th, there were SM-4 minicomputers as well.

I switched to PC since 1989 and then since 2001 was back to the real thing: Sun Ultra (4 processors with 4 Gb of RAM).

FORTRAN-IV was a natural choice for the first programming language. The slogan of that time was "Real Programmers Don't Use Pascal". During PC time I switched to Fortran 77. Yet, after I had written kcl, I understood that it is time to search for another programming language and switched to C++. I still like it.

At IMTEK, I used Mathematica for rapid prototyping. Well, I worked with Reduce during 90th but only at IMTEK I have learned the beauty of Lisp. I would say that Mathematica is Lisp with a human face.

At present, I am using Python with SciPy for rapid development.

Codes presented at this page are from my archives. They are available under the GNU public license.

I do not like programming in assembler. Yet, in the case described below there was no choice. I used Borland Turbo Assembler at that time.

In 1990-1993, I used to have a Toshiba laptop with a CGA-like card without a Russian font. This meant that when I opened a file in Russian, I saw some strange characters instead of Cyrillic letters and there was no way to change it at the software level.

Finally, I have written in assembler a small resident program (ruscga) that converted Cyrillic letters to English equivalent. Not really nice but at least I was able to read the text.

I do not remember the names of Fortran compilers for BESM-6 and SM-4.
During PC time, I have used Lahey. I liked it a lot. I get used to some Lahey
extenstions, like "`PRINT,something`

" or "```
OPEN
(1,'filename')
```

" and I needed to fix it to compile the code under g77.
I have switched to g77 in 1998.

My thoughts about Fortran, "Let Fortran die naturally", related to the discussion at the site http://www.fortranstatement.com/.

`msd`

is a small interactive program that I have written to
process ion currents measured by high temperature mass-spectormetry. The goal
was to make a simple statistical treatment and then determine enthalpies and
entropies of a reaction by so called Second and Third Law (widely
accepted slang in high temperature mass spectrometry).

The program was written in Fortran-IV for soviet SM-4 minicomputer, I guess, in 1984. Then in 1993 I have compiled it for PC with Lahey compiler. At that time, Cyrillic characters in help have been converted to English letters as many people had a PC with a CGA card without a Russian font.

From a modern viewpoint, it is rather primitive but at that time many students used it.

`eqconst`

is a program that I have written in 1992 for my papers on the simultaneous treatment of
equilibrium constants. Mathematically speaking, this is multivariant
regression. The goal was to apply it for my special case. Basically, this is
rather straightforward linear algebra.

The archive also contains the data files with the experimental equilibirum constants from the papers. In my view, the file format was not that bad as compared with conventional Fortran datafiles.

It is necessary to have either LIN3VP from IMSL or Lapack.

This is the code that I wrote to make computations for papers on KCl. I have made it in 1992 for Lahey compiler at my PC. The archive also contains the original datafile with experimental results from many papers.

Mathematically speaking, this the maximum likelihood for a special case. Requirements: IMSL subroutines ZXSSQ and LINV3P.

The code is inflexible: using it for another case means almost a complete re-write. Yet, there were no way to make it flexible in Fortran 77 and since then I switched to C++. Technically speaking, I needed an array of pointers to functions not speaking of memory managment. The next step in this direction was varcomp.

The archive contains a sample code that I have written in 1993-1998 to compute equilibrium composition for my papers. The code is rather simple: this is a loop to run VCS several times to produce a file with results for plotting. The archive also contains the Gibbs energies required for computations.

Requirements: VCS subroutine from Smith and Missen's book.

I used Borland C++ from version 2.0 to 5.01. Since 1999 I use gcc.

`task`

is pretty a simple code written in 1993 to make a random
list of questions for a student from the database. At that time, I was using
CHIWRITER,
so the program reads a CHIWRITER file and them make another CHIWRITER file
for a printout. I was learning C++ at that time, and task.cpp is a wild
mixture of C and C++. What I like most now is the manual (in Russian).

`varcomp`

is a library to perform the maximum likelihood method
under the linear error model. First version was in 1994. I have used it
extensively for many papers from 1994 to
1998. This was a huge improvement after kcl. It simplified
the development of the code to make a paper significantly.

The archive contains the library, the code specific for each paper and the datafiles.

My next development in this direction was tdlib where I tried to reduce the programming to minimum in order to solve an application problem.

Computation of equilibrium composition in the multi-phase, multi-component system is a challenge. Mathematically speaking, this is a search for global minimum. The main problem is to find the global minimum indeed. The difference with other global minimization problems is that a good physical background and a criterion to check whether the minimum is global are available.

The code was my try to couple DONLP2 (Do NonLinear Programming) with an initial guess found from the physical background based on linear programming. It worked nicely for a three-component system in question. The question whether this approach can be generalized to four- and more- component systems is to be researched.

I have written this in 1998 during the work on the book. These are simple codes with a pretty straightforward calls to Win32 functions LookupAccountName and LookupAccountSid. The most interesting was their creative use (see my message to NTBugtraq in the archive).

Many, many people, working with Windows, used these utilities. For example, they were included in Hacking Exposed (as result, I got a book for free). You can browse Google results for sid2user.

tdlib manual, Download (manual included)

`tdlib`

was my major programming project from 1995 to 2000. Its
feature was XML-like external representation for the developed classes. This
was an effort to make a uniform computational framework for computational
chemical thermodynamics. On one side, there were several iterations after species, on another, a new
version of varcomp. The main drawback is that there is
still no good solver to compute equilibrium in a multiphase system. Currently, this
is possible only when co-existing phases are given. Originally to this end, I
planned to generalize bacuy_eq, but I
did not have time to accomplish it. It happened that for inverse tasks this
was not the the major problem as one usually knows co-existing phases in this
case.

I have started working on model
reduction in 2001 and on `mor4ansys`

in 2003. From a programming
viewpoint, this is much simpler than tdlib. The main
problem here is in software integration. In order not to re-invent the wheel,
one should use libraries. Yet, it also takes time to learn, hack, compile and
link. I guess that it will take at least a few days for someone to make a
mor4ansys binary if he is not familiar with the background libraries. Well,
it is necessary to compile them first. And then linking. It is another
song. By the way, a nice book in this respect is Linkers and Loaders.

I started using Mathematica in 2001. I should say that I like its clean language.

Download the code

mor4ansys produces a compact model in the Matrix Market format. I use Mathematica to make transient and harmonic simulation for compact models produced by mor4ansys.

Download the code

This was an example for Mathematica Developer Conference on how to create a Mathlink application in order to interface an external code when a user function is defined within Mathematica. I have used a numerical integration with quadpack to demonstrate this. Alternatively, download the paper:

*O. Ruebenkoenig, E. B. Rudnyi, J. G. Korvink.*

**MathLink + Netlib = MathLib**.

2003 Mathematica Developer Conference.

Paper at library.wolfram.com.

Download the code

Before I have written mor4ansys, I developed a Mathlink interface in order to play with ANSYS binary files from within Mathematica. I made a Mathlink interface to the ANSYS bin library.

Download the code

Yet another Mathlink interface to SLICOT routines on model reduction. It supports Balance & Truncate model reduction (BTA) AB09AD; Singular perturbation approximation based model reduction (SPA) AB09BD; Hankel norm approximation based model reduction(HNA) AB09CD.

Download the code

An experimental version of a Mathlink interface for Design Optimization Tools (DOT).

I started writing in HTML in 1993. Mostly these were static pages. Two dynamic applicatiions are below.

This is a Web-application written in VBScript for IIS 4 in 1999. The goal was to make an interactive book about NT Server. The book by itself is not included (pages listed in global.asa). The idea was from Vasilii Lutsarev. It used to work under IIS 4.

Micropyros Software web page, Download

The application has been created during the Micropyros project in 2002-2003. It is written under webMathematica. The code consists from normal Mathematica scripts defining useful functions and Web pages that call these functions on the server side.

I learnt Paradox during my stay at NIST.

This is my application R-Cite written in Paradox Application Language (PAL ) in 1992 under Paradox 3.5. I have written it to handle my literature references. I have used it a lot for myself in 90s but nowadays I would recommend you Endnote.