Just a short description of my professional activities and background (I felt obliged having participated on the newsgroup and the Wiki after several months):

- By education I am a physical engineer (a title not well known in Anglosaxon countries, but that is the translation from the Dutch).
- I have been working at WL | Delft Hydraulics for a good many years now, first as a project engineer working on water quality modelling, later on as a computer scientist (well, sort of), working on user-interfaces and tools for our consulting activities.
- I "discovered" Tcl/Tk when reading a famous book by Boris Beizer (BOOK Software Testing Techniques), and later on my attention was drawn to it again in connection to a testing tool (automated GUI testing). It was simply the tool I had been looking for. For all kinds of purposes: testing, manipulating files, boring stuff that I used to do with UNIX shell scripts or DOS batch files and so on.
- My interests: FORTRAN as a computational language, Tcl as a language for almost anything else and even a bit of numerics if I can manage it, testing techniques (although I should listen to my own advocacy at times :-).

Email: Arjen dot Markus At deltares dot nl

I have written several papers relating to Tcl:

- "Generating test programs using TestMake" - presented at the Second European Tcl/Tk User Meeting
- "Doing mathematics with Tcl" - presented at the Third European Tcl/Tk User Meeting
- "Combining FORTRAN and scripting languages" - published in the ACM FORTRAN Forum [L1 ], Volume 21, Number 3, December 2002.
- "Creative use of the text widget" - presented at the Fourth European Tcl/Tk User Meeting

Current mega pet project: The young programmers' project, intended to produce a booklet or book for young people or unexperienced adults to learn programming [L2 ]

Just to remind myself of the pages I have initiated (in desperate need of an update ...):

- A little business logic
- A little graphical pointer
- a little hail storm
- A poor mans GUI
- A simple memory game
- A simple slideshow
- A simple version of Eliza
- A very short story
- Adding, multiplying and composing functions
- Agents, sprites and young programmers
- Angles and directions
- Automatic differentiation
- calling FORTRAN routines in a DLL
- Cellular automata
- Chatroom wisdom
- Clock and daylight saving time corrections
- Colouring graphs
- Combining FORTRAN and Tcl in one program
- Complex data structures
- Composing Curves
- Computers and real numbers
- Constructing curves
- Covering a four-dimensional grid
- Creating an animated display, part 2
- Creating an animated display
- Creating your own expr command
- Critcl goes FORTRAN
- Daddy, how does a computer work
- Dangerous constructs
- Differentiation and steepest-descent
- Dijkstra's guarded commands
- Discrete Fourier Transform
- Displaying tables
- Distributing a series of tasks
- Dutch Tcl Users Group
- exec and error information
- Experiments with matrix operations
- Fiddling with Fourier series
- finding the shortest paths in a graph
- Finite state machines
- Floating-point formatting
- Garbage collection
- Generating random strings
- Generating random tests
- Generic compiling and linking via build tools
- Genetic Algorithms
- Geometry
- Group theory and permutations
- GUI for an existing program
- How to make a Tcl application - part three
- How to make a Tcl application - part two
- How to make a Tcl application
- Ideas for a numerical analysis package
- Integral equations
- Looking at LISP's SERIES extension
- Managing FORTRAN programs
- Mandelbrot and Julia sets
- Manipulating infinite sets in Tcl
- Manipulating sets in Tcl
- Markov Matrices
- Mathematical workbench
- Moving dots
- Nested Radical Constant
- Non-ASCII characters
- On mathematical notation
- Parser using recursive descent
- Partial Differential Equations - performance benchmarks
- Pascal's triangle
- Passing arrays of data
- Performance of string reversing algorithms
- Physical empirical formulae
- Plots and charts
- Polynomial fitting
- Polynoms and power series
- Producing a fractal convex solid
- quality of source code
- Quick-n-dirty debugger
- Raster operations on the canvas
- Reading GIS shape files
- Recursive functions
- Robust environment variables on Windows
- Rough sets
- Setup of a Tk tutorial
- Simple data plotting example
- Simple method for computing mathematical limits
- Simple zooming and scaling in a canvas
- Simulating a server system
- Slicing arrays
- Small tool for the after command
- Splitting a string on arbitrary substrings
- Starkit with Iwidgets
- Strange figures
- Super-exponential growth in text manipulation
- Surreal numbers
- Taking the Nth power
- Three-dimensional shapes
- Traversing listboxes via the keyboard
- Vector spaces
- Writing PPM files
- Manipulating blocks of data
- FEMTOL
- Thinking about physical computations
- Viewer for functions of two variables
- Mathematical notebook
- Properties editor

AMG: Just a note. To delete a page, replace its entire contents with a single space. Obviously, feel free to delete this comment when you read it. AM ah, I had forgotten about that feature.