similar to: problems with for: warnings and segfault

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 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?be able to?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

Hello R Community, I have imported a dataset which contain X Y coordinates and would like to recreate a shape file after some data analysis. What i have done is to import some taxlot data and join them based on some criteria. I want to check to see how well the joining went by reviewing the results in GIS. A couple things. I cant seem to import a shape file correctly using the maptools

Hi everyone! I have 100 tables of the form: XCOORD,YCOORD,OBSERVATION 27.47500,42.52641,177 27.48788,42.52641,177 27.50075,42.52641,179 27.51362,42.52641,178 27.52650,42.52641,180 27.53937,42.52641,178 27.55225,42.52641,181 27.56512,42.52641,177 27.57800,42.52641,181 27.59087,42.52641,181 27.60375,42.52641,180 27.61662,42.52641,181 ..., ..., ... with approximately 1000000 observations for each.

Hello, I've a problem for setting graphical parameters in perspective plot (function persp). I wonder if it's possible to add some text (function text) on an existing persp plot USING the axis coordinates. In fact I want to add some text on a persp plot according to x coordinates. I've tried to use text(xcoord,ycoord, label="toto") but the toto text doesn't appear at

I am working on creating an R package for doing fire department analysis and am trying to create a function that can display emergency incident densities. The following code sort of does the trick, but I need a display that shows the number of incidents per square mile. I believe the code below shows incidents per square unit (in this case, degrees lat/long). To solve this problem, I believe

Dear all,  Who will bail me out. Iam using R with S-Splancs. Anytime i typed in the syntex, an error will appear eg setwd("C:\\TEMP) >dat <- read.table(cheshire_fmd.cvs",header=TRUE, sep=",") > dat.<-read.table(''chesire_fmd.cvs'',header=TRUE,sep='',) Error: unexpected symbol in "dat.<-read.table(''chesire_fmd.cvs" >

Hello R-users, I have code that gives me the important variables from an analysis. I need to input these variables into a different analysis. To do this, I need to modify them slightly... 1) remove all numbers at the end of the variables, 2) remove all periods. I tried to do it with the awkward code below. It works to remove all the numbers, but when I try to remove the period everything

Hallo, I have a set of S4 and S3 classes together in one script. While running this script I create a lot of new functions and objects An example for S3 and S4 classes: ## S3 classes pt <- list(x=1,y=2) class(pt) <- "xypoint" xpos <- function(x, ...) UseMethod("xpos") xpos.xypoint <- function(x) x$x ypos <- function(x, ...) UseMethod("ypos")

I want to do kernel smoothing on the standardised mortality rates at specified location(x-y coordinates) and be able to produce contour map. I've tried to use the package called fields in R (function smooth.2d) but the problem is I get negative results after smoothing and I do not understand why? Your contributions will be highly appreciated or if there is any package that can do this I

Hello again, First I want to thank all the people who answered my question about line width in graphs. I promise I will learn the 'par' help page by heart for the end of the month ! I now want to trace some ellipses to emphasize groups of data. I found how to trace circles with 'symbols()', but no ellipse. I'm planning on writing my own function based on

Hi all, I am new to R, hence this question. I have a set of points with X and Y coordinates. I would like to build an R code to calculate the distances of points within a specified neighborhood (circular range) for each point. I would like the code to be a function, so that I can call the function, specifying parameters (data file, distance), from another piece of code. Also, I would like the

Hello, I have multiple observations (replicates) per station...and the stations are distributed in space. I've applied models using lme and gls from the nlme library. I've messed around with compound symmetry to capture the correlation within stations. My question is.....I have x and y coordinates for each station (the subsamples have nearly the same coordinates)...how do you

Full_Name: thomas cornulier Version: 1.9.0 and 1.9.1 OS: Win XP Submission from: (NULL) (194.254.155.62) the following function produces R crashes under windows XP platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 1 minor 9.1 year 2004 month 06 day

Please see the code below. When I try to run the variogram - vg.deft<-variog(rd,uvec=10) I keep getting this error- variog: computing omnidirectional variogram Error in vector("double", length) : vector size specified is too large Also, when I try to define distance-based neighborhood - nb.tr=dist.neighbors(tr.locs,2) I get this error - Error in vector("double", length) :

Hi, I have a very simple doubt. Look: > teste <- c("A","B","C") > teste2 <- paste(teste[1],teste[2],teste[3],sep="+") > teste2 [1] "A+B+C" > How to make it automatic, like I try to use paste(teste,sep="+") but the paste dont get the teste elements separately to join again in a unique element. Exist any

Hi, I try to use a substitute function to generalise a equation. I have this: expression(1+2*pred+3*lat) I need to define the equation in function of x1 and x2 variables. Also I try to define who is x1 and x2. I try this: X1 <- "pred" X2 <- "lat" Now I need substitute pred and lat in equation by x1 and x2 defined on X1 and X2 above, I try this way: >

Hi, I try to make a plot like this: Y | | | o | o o | o o | o o |o o o |-------------------------------- 0 10 20 30 40 50 60 70 80 90 100 (A) 100 90 80 70 60 50 40 30 20 10 0 (B) or B 100 90 80 70 60 50 40 30 20 10 0 Y |-------------------------------- | | o

Hi, this is a simple question I have this data.frame: > test <- data.frame(var1=c(1,1,1,1,1,1),var2=c("a","a","b","c","d","e"),var3=c("a1","a1","b1","a1","c1","d1")) > test var1 var2 var3 1 1 a a1 2 1 a a1 3 1 b b1 4 1 c a1 5 1

Hi, I have two tables and I need to merge both. I use the merge command, but in this way the name must be exactly. How I can make to compare independently of upper or lower-case? Look: data1<-data.frame(journal=c("Ecology","Environmental Entomology","Neotropical Biology And Conservation"))