similar to: string interpolation

is there a way to look for value changes in a column? set.seed(144) df<-data.frame(state=sample(rep(1:5,200),1000)) any of the five states are acceptable. however if, for example, states 4 or 5 follow state 3, i want to overwrite them with 3. changes from 1 to any value and 2 to any value are acceptable as are changes from any value to 1 or 2. By way of an example: the sequence 1 3 3 5 5 3

I think need to do something like this: dat<-data.frame(state=sample(id=rep(1:5,each=200),1:3, 1000, replace=T,prob=c(0.7,0.05,0.25)),V1=runif(1,10,1000),V2=rnorm(1000)) rle.dat<-rle(dat$state) temp<-1 out<-data.frame(id=1:length(rle.dat$length)) for(i in 1:length(rle.dat$length)){ temp2<-temp+rle.dat$length[[i]] out$V1[i]<-mean(dat$V1[temp:temp2])

I am trying to extract the shape and scale parameters of a wind speed distribution for different sites. I can do this in a clunky way, but I was hoping to find a way using data.table or plyr. However, when I try I am met with the following: set.seed(144) weib.dist<-rweibull(10000,shape=3,scale=8) weib.test<-data.table(cbind(1:10,weib.dist))

Happy weekend helpeRs! As usual, I'm stumped by R... My plan was to take an integer number, convert it to binary and wind up with a data.frame where each column is either 1 or 0 so I can see which bits are changing: bb<-function(i) ifelse(i, paste(bb(i %/% 2), i %% 2, sep=""), "") my.dat<-c(36,40,10,4) my.binary.dat<-bb(my.dat)

I need to run a bash command, but when you call system() the default shell is sh (see my sessionInfo below). I found the shell command ( http://www.stat.ucl.ac.be/ISdidactique/Rhelp/library/base/html/shell.html) but it seems to be disappeared in current versions of R? I am running all this from R CMD BATCH with "system" calls to other R scripts. For a little more info, I'm

Hiya, maybe there is a native R function for this and if so please let me know! I have 2 data.frames with start and end dates, they read in as strings and I am converting to POSIXct. How can I check for overlap? The end result ideally will be a single data.frame containing all the columns of the other two with rows where there were date overlaps.

Hello, Why do I get preceding "X." (that is a and X followed by a period) for negative numbers and an "X" for positive numbers when I read a csv file? Am I stuck with this? If so, how do I convert it to normal numbers? dat=read.csv(file_path) > dat [1] X0.0 X.0.240432350374 X0.355468069625 X.0.211469972378 X1.1812797415 X.0.227975150826

Hi, I am trying to learn to use ggplot2 for what I had hoped would be a fairly simple task. I have a relatively small data.frame (100 by 4). The first column contains symbols. The 2nd, 3rd and 4th columns represent percentage weightings for each symbol using 3 different methodologies. For example: sym <- make.unique(replicate(100, paste(sample(LETTERS, 3, replace = TRUE), collapse =

Whats going on here? df<-data.frame(x=1:10,y=1:10) ggplot()+geom_point(data=df,aes(x=x,y=y)) ## this is the normal usage right? ggplot()+geom_point(data=df,aes(x=df[,1],y=df[,2])) ## but I can also feed it column indices ggplot()+geom_point(aes(x=df[,'x'],y=df[,'y'])) ## or column names. ## but if i wrap it in a function... plot.func.one<-function(dff,x.var,y.var){

If I have data: dat<-data.frame(a=rnorm(20),b=rnorm(20),c=rnorm(20),d=rnorm(20),site=rep(letters[5:8],each=5)) And want to plot like this: ctr<-1 for(i in c('a','b','c','d')){ png(file=paste('/tmp/plot_number_',ctr,'.png',sep=''),height=8.5, width=11,units='in',pointsize=9,res=300) print(ggplot(dat[,names(dat) %in%

Has the Levene test of homogeneity of variance been implemented in any library in R? Thanks, Maurice Haynes National Institute of Child Health and Human Development Child and Family Research Section 6705 Rockledge Drive Bethesda, MD 20892 Voice: 301-496-8180 Fax: 301-496-2766 E-Mail: mh192j at nih.gov

Hi, I am having a problem getting a Makefile after I run configure as follows: ./configure --prefix=/opt/samba-3.5.4 --with-ads --with-krb5=/opt/samba-3.5.4/include/ --with-shared-mod ules=idmap_rid --with-ldap=/opt/samba-3.5.4/include/ldap.h There is no Makefile generated. Configure runs successfully. The error I get is: # /usr/local/bin/make make: *** No targets specified and no makefile

Hi, In my form I have date field set as ''datetime_select'' which is fine as I wanted it in the same format. But while displaying (list action) it displays date in long format i.e. ''Tue May 30 15:39:00 Central Daylight Time 2006''. How can I format it so that it will just be diaplyed as ''dd/mm/yyyy'' format? Thanks -- Posted via

Quick ActionMailer Question: I''m trying to send a test email message using ActionMailer and I get a Net::SMTPSyntaxError (502 unimplemented (#5.5.1) error. I''m attempting to access a remote smtp server and have setup my settings in the environment.rb file according to the "how to" article. My test controller: class MailTestController < ApplicationController

I''m digging into BackgrounDRb and having some problems testing a worker class. The following line in my test (created from script/generate worker Test) throws an error: worker = TestWorker.new(:test_string => "testing...") Error: /activesupport/lib/active_support/dependencies.rb:123:in `const_missing'': uninitialized constant BackgrounDRb (NameError) from

Hello, I was wondering whether there is a nice Rubyesque way of selecting from a pair of HABTM models where one of them is inherited from another object. Here is the situation: I have a ''posts'' table from which ''replies'' and ''articles'' are inherited. Articles have_and_belong_to_many categories, but neither posts nor replies do (it just does

I''m using the date_select form helper for a date_of_birth field on an ActiveRecord object. When I try to save a date earlier than 1 Jan 1970, ActionController punts with ActiveRecord::MultiparameterAssignmentErrors. The message it gives is "1 error(s) on assignment of multiparameter attributes". I was able to catch the exception and look at it, and it is certainly complaining

I have 2 radio buttons like this: <%= radio_button ''group'', ''public'', true %> <%= radio_button ''group'', ''public'', false %> They hold the correct values when viewing the @group object. However, when updating, it does not appear that the params[:group][:public] value is being typecast correctly. As

All, I''ve come across a confusing problem when attempting to run unit tests for an application on OSX (works on Windows). I''m receiving the following error: `load_specification'': undefined method `parse'' for Time:Class (NoMethodError) This is also confusing because I can''t figure out how the error appeared. When I revert back to previous revisions,

Is there a way to set the :status when using inline RJS rendering in controllers? Something like: render :status => 500, :update do |page| page.insert_html .... end -- Derek Haynes HighGroove Studios - http://www.highgroove.com Atlanta, GA | San Mateo, CA Keeping it Simple. 404.751.1762