search for: hydrobiology

Hi, I'm astudent in hydrobiology and I actually work on river's discharge and try to extract from my data the seasonal and trend components. I use STL function but I have several problems in understanding what this function have done. I'd like to know what means the IQR results which gave me some % about the seasonal com...

...table Linux distribution with gcc 4.8, ideally an ISO image or (even better) a virtual appliance for VMware or VirtalBox? My Debian Wheezy machines have only 4.7.2. Thank you Thomas Petzoldt -- Dr. Thomas Petzoldt Technische Universitaet Dresden Faculty of Environmental Sciences Institute of Hydrobiology 01062 Dresden, Germany E-Mail: thomas.petzoldt at tu-dresden.de http://tu-dresden.de/Members/thomas.petzoldt

...ript should run not only on linux, but also on windows machines without cygwin, perl or similar. Is there a simple "R only" solution? Otherwise I should write a special C program. Thanks in advance! Thomas Petzoldt -- Dr. Thomas Petzoldt Dresden University of Technology Institute for Hydrobiology 01062 Dresden mailto:petzoldt at rcs.urz.tu-dresden.de http://www.tu-dresden.de/fghhihb/ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",...

...xt(0.5,0.6,expression(y == frac(x,sigma))) # o.k. readline("press return") text(0.5,0.5,expression(y == e^-frac(x,sigma))) #segmentation fault #---------------------------------------- Any idea? Thank you very much! Thomas Petzoldt -- Dresden University of Technology Institute of Hydrobiology http://www.tu-dresden.de/fghhihb/ mailto:petzoldt at rcs.urz.tu-dresden.de -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe&quot...

Hi Kurt, I have started to look into this, and I need some guidance about how to prioritize my repairs. There are basically 4 categories of warnings from gfortran?s pedantic critique of my packages: 1. Some errant tab characters it doesn?t like, 2. Too many or too few continue statements 3. Horrible (and obsolescent) arithmetic and computed gotos 4. undeclared doubles and dubious

..., as in contour(). Unfortunately, I found no solution to get the internal data from contour(). Is there a possibility to extract contour lines as x-y-polygon from a grid without hacking plot3d.c? Thank you in advance! Thomas P. -- Thomas Petzoldt Dresden University of Technology Institute for Hydrobiology mailto:petzoldt at rcs.urz.tu-dresden.de 01062 Dresden http://www.tu-dresden.de/fghhihb/ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",...

...nying library (the name simecol may be changed soon). Thank you for your feedback! Many thanks to all the people who are making the R-project possible! Thomas -- Thomas Petzoldt Tel. +49-351-463 3 4954 Dresden University of Technology Fax +49-351-463 3 7108 Institute for Hydrobiology petzoldt at rcs.urz.tu-dresden.de 01062 Dresden http://www.tu-dresden.de/fghhihb/petzoldt/

Hi Does anybody know of any R packages under Windows to produce video files from a sequence of R graphs -- e.g. in .wmv or avi format? Thanks David

Hi, Does any one knows how to include greek letters in plot labels and plot titles ? Thanks a lot paul --- [[alternative HTML version deleted]]

Hi, I've two fitted models, one binomial model with presence-absence data that predicts probability of presence and one gaussian model (normal or log-normal abundances). I would like to evaluate these models not on their capability of adjustment but on their capability of prediction by calculating the (log)likelihood between predicted and observed values for each type of model. I found

I need to solve a system of non-linear fourth-order differential equations. Is there a command which solves this system? Thanks in advance.

...man_Germany.1252 [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C [5] LC_TIME=German_Germany.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base -- Dr. Thomas Petzoldt Technische Universitaet Dresden Faculty of Environmental Sciences Institute of Hydrobiology 01062 Dresden, Germany E-Mail: thomas.petzoldt at tu-dresden.de http://tu-dresden.de/Members/thomas.petzoldt

Thank you so much for your help. The function "dbinom" seems to work very well. However, I'm a bit lost with the "dnorm" function. Apparently, I have to compute the mean "mu" and the standard deviation "sd" but what does it mean exactly? I only have a vector of predicted response and a vector of observed response that I would like to compare! What

...le? >> >> Best >> -k > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- Dr. Thomas Petzoldt Technische Universitaet Dresden Faculty of Environmental Sciences Institute of Hydrobiology 01062 Dresden, Germany Tel.: +49 351 463 34954 Fax: +49 351 463 37108 E-Mail: thomas.petzoldt at tu-dresden.de http://tu-dresden.de/Members/thomas.petzoldt -- limnology and ecological modelling --

Hi, I am almost new to R. Would any one show me (please include an example) how to clip a contour or image figure so that I only see the image or lines inside a selected area? Thank you very much Han -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",

Dear List, Wonder if you have some thoughts on the following question using lsoda in desolve: I have the following data and function: require(deSolve) times <- c(0:24) tin  <- 0.5 D <- 400 V    <- 26.3 k <-0.056 k12  <- 0.197118 k21  <- 0.022665 yini <- c(dy1 = 0,dy2 = 0)  events <- data.frame(var = "dy1",time = c(10,15),value = c(200,100),method =

...| >> -k | > | > ______________________________________________ | > R-devel at r-project.org mailing list | > https://stat.ethz.ch/mailman/listinfo/r-devel | > | | | -- | Dr. Thomas Petzoldt | Technische Universitaet Dresden | Faculty of Environmental Sciences | Institute of Hydrobiology | 01062 Dresden, Germany | | Tel.: +49 351 463 34954 | Fax: +49 351 463 37108 | E-Mail: thomas.petzoldt at tu-dresden.de | http://tu-dresden.de/Members/thomas.petzoldt | | -- limnology and ecological modelling -- | | ______________________________________________ | R-devel at r-project.org mail...

Hi all, I think this question could be quite trivial, but I can?t find out the solution... How can you compute the statistic "mode" of a sample, in case it exists (as mode() returns the mode of an object)? I tried help.search("mode") but I couldn't find a clue... Any help would be much appreciated. Regards, Aurora

hi all i have another probably simple question. I have three variables say x, y and z. x and y are quite large and z is relative small. how can one plot the three variables on the same graph with two separate axis? (one for x and y and the other for z) e.g. x<-c(101,110,150,167,120) y<-c(120,135,175,95,200) z<-c(0.001, 0.15, 0.6, 0.8, 1) regards Allan

Hi - I am getting different results when I run the numerical integrator function lsoda (odesolve package) on a Mac and a PC. I am trying to simulating a system of 10 ODE's with two exogenous pulsed inputs to the system, and have had reasonably good success with many model parameter sets. Under some parameter sets, however, the simulations fail on the Mac (see error message below). The