Dear R and hydrological/environmental community,
A major release of hydroPSO is now available on CRAN. This new release:
-) implements the Standard Particle Swarm 2011 (SPSO-2011)
-) is parallel-capable, to alleviate the computational burden of
complex models with "long" execution time
-) has an improved performance (33% - 38% faster)
-) allows normalization, when the parameter space is not a hypercube
-) includes seven new benchmark functions
-) includes two new functions for importing/exporting from/to PEST
-) handles models with sub-daily time step and with sub-daily observations
-) has a new vignette
-) computes the normalised swarm radius using the median distance of
all the particles to the global best (instead of using the maximum
distance)
hydroPSO is a global optimization R package implementing a
state-of-the-art version of the Particle Swarm Optimization (PSO)
algorithm.
hydroPSO can be used as a replacement of 'optim' for (global)
optimization of non-smooth and non-linear functions. However, the main
focus of hydroPSO is the calibration of environmental and other
real-world models that need to be executed from the system console.
hydroPSO is model-independent, allowing the user to easily interface
any computer simulation model with the calibration engine (PSO).
hydroPSO communicates with the model through the model's own input and
output files, without requiring access to the model's source code.
Several PSO variants and controlling options are included to fine-tune
the performance of the calibration engine to different calibration
problems.
An advanced sensitivity analysis function together with user-friendly
plotting summaries facilitates the interpretation and assessment of
the optimization/calibration results.
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hydroPSO 0.3-0 is already available on CRAN:
http://cran.r-project.org/web/packages/hydroPSO/
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This package includes a vignette (tutorial) showing how to calibrate
SWAT-2005 (http://swatmodel.tamu.edu/software/swat-model/) and
MODFLOW-2005 (http://water.usgs.gov/nrp/gwsoftware/modflow2005/modflow2005.html)
for real-world case studies.
You can download the vignette and all the files required to follow the
two case studies from:
http://www.rforge.net/hydroPSO/
For assistance/bugs, comments, and/or collaboration do not hesitate to
contact the authors (in English, Spanish or Italian):
Mauricio Zambrano-Bigiarini <mzb.devel [at] gmail.com>
Rodrigo Rojas <Rodrigo.RojasMujica [at]
gmail.com>
Kind regards,
Mauricio Zambrano-Bigiarini, Ph.D
--
=====================================Water Resources Unit
Institute for Environment and Sustainability
Joint Research Centre, European Commission
webinfo : http://floods.jrc.ec.europa.eu/
=====================================DISCLAIMER:\ "The views expressed are
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