This page lists a few more details about me, in addition to my official homepage.
My list of publications can be found in any of the following dictionaries:
Ecological modelling for systems understanding and water quality management.
Development of open source tools for the efficient implementation of ecological models.
Our modelling technology depends on the question. We use differential equations and individual-based simulations but also statistical models or neural networks. The size of the models can be different as well, from very simple process models up to models at the ecosystem level (e.g. coupled lake model SALMO).
Most downloads below use the R software and you may ask why…
Several years we were working with different systems and languages like Fortran, Basic, Pascal, Delphi, JAVA, C/C++, Spreadsheets, Simulation Dynamics tools etc. Now we do most things in R and some time critical parts in C/C++ or Fortran. Why?
R is more efficient for us: easy programming, fast enough, packages for “almost everything”, flexible graphics, supports writing up research. Important was also, that the R community uses scientific publications for communication and getting scientific credit. We still use other software, but only with R we feel it worth to make our tools publicly available.
deSolve (Soetaert, Petzoldt, Setzer): the main workhorse for initial value problems of differential equations in R.
FME (Soetaert, Petzoldt): tools for sensitivity analysis, model fitting and Markov chain Monte Carlo (MCMC)
marelac (Soetaert, Petzoldt, Meysman): tools for aquatic sciences; chemical and physical constants, physical properties of seawater and dissolved substances, calculation tools
simecol (Petzoldt): implements an “object model of models”, applicable to ODE/PDEs, IBM/ABMs and cellular automata
qualV (Jachner, Boogaart, Petzoldt): model validation criteria, especially for models with time delay
proto (Grothendieck and Petzoldt, now maintained by Hadley Wickham): implements lightweight prototype-based (i.e. classless) object orientation
cardidates (Rolinski, Sachse, Petzoldt): peak-fitting and determination of “cardinal dates” in environmental time series
growthrates (Petzoldt): fit population growth models to experimental data