search for: trophic

...tfiles and running it through graphviz, the graphics I get from R are much cleaner, and more easily integrated into my analyses. Is there any good way to diagram a hierarchical network in R, either with the sna library or otherwise? It strikes me that at least the Netindices package can calculate trophic levels. Could this be used for node placement? -Jarrett -- View this message in context: http://www.nabble.com/Hierarchical-Diagram-of-Networks-in-sna-or-otherwise--tp23301819p23301819.html Sent from the R help mailing list archive at Nabble.com.

...tope Analysis in R) an Ecologist's Guide (also better known as 'SIAR for dummies'), which is as follows: - consumer data table (columns include code for species, d15N signatures, d13C signatures) - source data table (columns include Source, mean d15N, SD d15N, Mean d13C, SD d 13C) - trophic enrichment factor table (columns include source, mean15N, SD d15N, mean d13C, SD d13C) I've read the tables in as .txt ('data' for consumer data, 'sources' for source data, and 'tef' for trophic enrichment factor) and tried to run the MCMC as follows: model1<-siarmc...

...n function call (arg 1) and with hansen also: Error in optim(par = c(sqrt.alpha, sigma), fn = function(par) { : function cannot be evaluated at initial parameters I'm not sure what I'm supposed to put in the sqrt.alpha and sigma parameters. I have several different selective regimes (trophic guilds). I have a single continuous character (body size). I read these data in as a table, and then made the columns into objects (or vectors? i.e. I did data2=allmydata$data2) and named them by node number. The tree is converted from ape. Thanks very much, and happy to provide more info......

R help list subscribers, I am a new user of R. I am attempting to use R to explore a set of equations specifying the dynamics of a three trophic level food chain. I have put together this code for the function that is to be evaluted by LSODA. My equations Rprime, Cprime, and Pprime are meant to describe the actual equation of the derivative. When I run LSODA, I do not get the output that these equations should be giving. Can someone...

...statistical questions of general domain, probably beyond the mere use of R. I want to analyze the following type of data with R . Total annual fisheries landings have been reported during 1950-2007 from a given fishery area. I am dealing with annual fisheries landings proportions (LP) estimated for trophic level (TL) classes of 0.1increment, i.e. each LP cell shows an estimated proportion of all fish landed for a given decade (D) year (Y) and TL class combination (usually TL = 2-5). I have observed that 0 <= LP < 1. I am interested in testing the effects for factors D, Y, TL and for interactio...

I would like to run a GLMM on categorical data. In this case the response data are abundance of insects of 4 trophic groups. I am unsure whether I need to cbind the categories and run with the model with family=multinomial4 or family=gaussian. Also I'm unsure whether I should use lme4 package or MCMCglmm. If anyone can give me any pointers, I would be most grateful. I am new to R and mixed models so I apol...

...E) + ... geom_point(data=Data,aes(x=lon,y=lat,color=Clst),size=1.25) + scale_color_manual(values=c("grey45","navy","skyblue","gold","green3","darkgreen")) + geom_path( data=world, aes(x=long, y=lat,group=group)) + labs(title = "Trophic Patterns - Full Data")+ guides(colour = guide_legend(override.aes = list(size=5))) después hago un loop con for: for (i in seq(from = -180, to = 170, by = 10)){ traindata <- subset(Data, lon < i|lon>= i+10) testdata <- subset(Data,(lon> i & lon<= i+10)) fitrp &l...

Howdy, I have at several times had issues with consumer grade PC hardware and ZFS not getting along. The problem is not the disks but the fact I dont have ECC and end to end checking on the datapath. What is happening is that random memory errors and bit flips are written out to disk and when read back again ZFS reports it as a checksum failure: pool: myth state: ONLINE status: One or more

If it''s of interest, I''ve written up some articles on my experiences of building a ZFS NAS box which you can read here: http://breden.org.uk/2008/03/02/a-home-fileserver-using-zfs/ I used CIFS to share the filesystems, but it will be a simple matter to use NFS instead: issue the command ''zfs set sharenfs=on pool/filesystem'' instead of ''zfs set

...I >> get >> from R are much cleaner, and more easily integrated into my analyses. >> >> Is there any good way to diagram a hierarchical network in R, either with >> the sna library or otherwise? ?It strikes me that at least the Netindices >> package can calculate trophic levels. ?Could this be used for node >> placement? >> >> >> -Jarrett >> -- >> View this message in context: >> http://www.nabble.com/Hierarchical-Diagram-of-Networks-in-sna-or-otherwise--tp23301819p23301819.html >> Sent from the R help mailing list ar...

CRAN (and crantastic) updates this week New packages ------------ * disclapmix (0.1) Maintainer: Mikkel Meyer Andersen Author(s): Mikkel Meyer Andersen and Poul Svante Eriksen License: GPL-2 http://crantastic.org/packages/disclapmix disclapmix makes inference in a mixture of Discrete Laplace distributions using the EM algorithm. * EstSimPDMP (1.1) Maintainer: Unknown Author(s):