search for: struve

...:09:20 0.0 9 2006-08-18 10:21:14 0.0 10 2006-08-18 10:34:18 0.0 11 2006-08-18 10:36:44 100.2 006-03-1 22:05:15 1815.798 2006-03-18 22:06:35 1815.798 2006-03-18 22:08:33 1815.798 2006-03-18 22:09:49 1815.798 2006-03-18 22:12:50 1815.798 2006-03-18 22:16:26 1815.798 Dr. Juliane Struve Imperial College London Department of Life Sciences Silwood Park Campus Buckhurst Road Ascot, Berkshire, SL5 7PY, UK Tel: +44 (0)20 7594 2527 Fax: +44 (0)1344 874 957 http://www.aquaticresources.org

...ut I haven't quite figured out how to apply it for this example. ? mean(DF$Data[match(trips,listoftrips)]) gives the mean?for all trips, so that's not right. How can I get?means for all trips in "trips" ??? ? Many thanks for any suggestions. ? ? Juliane ? ? ? ? ? ? ?Dr. Juliane Struve Environmental Scientist 10, Lynwood Crescent Sunningdale SL5 0BL 01344 620811 ----- Original Message ---- From: jim holtman <jholtman at gmail.com> To: Juliane Struve <juliane_struve at yahoo.co.uk> Cc: r-help at r-project.org Sent: Friday, 18 September, 2009 15:02:47 Subject: Re: [...

...a variable in the select statement because I have many individuals in the original csv file, is this possible ? I have no experience with sql, perhaps someone can kindly point out how to do this correctly or offer an alternative solution ? Thank you very much and happy Friday, Juliane Dr. Juliane Struve Fisheries and Aquatic Sciences 7922 NW 71st Street, Gainesville, FL 32653 352-273-3632 (tel) 352-392-3672 (fax) email:mailto:jstruve@ufl.edu [[alternative HTML version deleted]]

...e those messages were posted.   Thank you for any suggestions how to approach this task or where to look.   Juliane   Previous posts:   www.mail-archive.com/r-help@r-project.org/msg13078.html http://www.nabble.com/Nelder-Mead-with-output-of-simplex-vertices-tp25838572p25869383.html   Dr. Juliane Struve Environmental Scientist 10, Lynwood Crescent Sunningdale SL5 0BL 01344 620811 [[alternative HTML version deleted]]

Dear list, ? I am using match() to match pairs of locations, e.g. trip="loc1,loc2" from a list of such pairs, e.g. list=("loc1,loc2", "loc1,loc3", "loc2,loc3","loc2,loc1"). ? In this example match() will match "trip" with the first element of "list", but not the 4th, because the order is reversed. ? How can I get a match with

...pose is to create a spatial model in R that uses ArcGIS map data. I have managed to read and plot various shape files into my R project, but I am stuck with this now. I am new to this list and also to R, so any help would be much appreciated. Many thanks and best wishes, Juliane Dr. Juliane Struve Adjunct Environmental Scientist Mote Marine Laboratory Center for Fisheries Enhancement 1600 Ken Thomson Parkway Sarasota, Florida, 34236 (941)388-4441 Ext. 408 ________ A Smarter Inbox http://uk.docs.yahoo.com/nowyoucan.html

...day=i+1] circularspace$ycoord[day=i+1]=circularspace$ycoord[day=i]+circularspace$yvelocity[day=i]/timesteplength } points(circularspace$xcoord[day=i+1],circularspace$ycoord[day=i+1]) symbols(0,0,circles=radius,inches=F,add=T) symbols(0,0,circles=radius-2,inches=F,add=T) } circularspace ?Dr. Juliane Struve Environmental Scientist 10, Lynwood Crescent Sunningdale SL5 0BL 01344 620811

Dear list, ? would anybody be able to tell me why the statement ? Tripstatistics=aggregate(TripsData[2:3],by=list(Trip=Tripmatch),FUN="mean") ? seems to work well with TripsData 1 but not with TripsData 2 ? ? With TripsData 2 it yields ? Error in FUN(X[[1L]], ...) : arguments must have same length I can't see a difference in the two data sets. Could someone shed light on the error

Dear list, I am trying to program semi-random movement within a circle, with no particles leaving the circle. I would like them to bounce back when they come to close to the wall, but I don't seem to be able to get this right. Would somebody kindly give me a hint ? This is my code so far, the particle starts at some point and moves towards the wall, but I don't get the "bouncing

Dear list, ? I would like to plot several age distributions that are influenced by a factor (called group in the data example below). I would like to use historam() in the lattice package, but I can't figure out how to set up the data. Could someone give me a hint how to do it? for the example below? ? Thanks a lot, ? Juliane? ? data <- structure(list(Age = c(1L, 1L, 1L, 2L, 2L, 2L, 3L,

Dear list, ? I am intersted in estimating movement based kernel densities for fish that were relocated at fixed receivers positioned along the coast. These data tend to display both a drift movment between receivers and a random movement component that can be estimated from the mean and the variance of the transit time between receivers. ?If I obtain an estimate of the diffusion coefficient from