similar to: by and by: using two indices in by() or tapply()

I have data similar to this: Location Surveyor Result A 1 83 A 2 76 A 3 45 B 1 71 B 4 67 C 2 23 C 5 12 D 3 34 E 4 75 F 4 46 G 5 90 etc (5 million records in total) I need to divide the data to many subsets then randomly select 5

Hi Trying to finish a simple xyplot, but the key colors don't match those specified on the plot. I have only been able to change the color of the key text, but not the points. Hours <- c (25.88,32.31,24.04,23.27,16.64,19.75,27.25,17.9,20.45,29.65,20.83,27.17, 28.42,28,18.85,17.4,19.75,25.34,23.23,29.85,28.96,25.6,14.67,20.55,25.77 ,

Hi -- I''ve got a very strange error. I have an action called ''commit_input'' on a controller called ''SiteVisitController''. This definately exists, and is called from the functional test for it, and passes fine. My problem is with the form that is supposed to call this action. The form tag is: <%=

HI Everybody Does anyone know of documentation about different ways of obtaining user input in R. I have used readline() but I wondered is there are sophisticated packages that does things like validate answers or generate selection lists. bets regards Christaan [[alternative HTML version deleted]]

Hi everybody. I want to identify not only duplicate number but also the original number that has been duplicated. Example: x=c(1,2,3,4,4,5,6,7,8,9) y=duplicated(x) rbind(x,y) gives: [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] x 1 2 3 4 4 5 6 7 8 9 y 0 0 0 0 1 0 0 0 0 0 i.e. the second 4 [,5] is a duplicate. What I want is

Hallo Everybody Consider the following vector a=1:10 b=20:30 c=40:50 x=c(a,b,c) I need a function that can tell me that there are three set of continuos sequences and that the first is from 1:10, the second from 20:30 and the third from 40:50. In other words: a,b, and c. regards Christiaan [[alternative HTML version deleted]]

Dear list-members, I would like to calculate the difference between two points in time. To convert a 'time (GMT)'-character with the format "1/1/1999 01:01:01" into an object of class "POSIXct"', I first use the strptime() as suggested in the details help(as.POSIXct). e.g. starttime<-strptime("1/1/1999 01:01:01",format="%d/%m/%Y %H:%M:%S")

I am having trouble with creating a POSIXct object. If I create a variable of class Date first out of the date part of my data, I am ok, but if I just paste the date and time parts together and try and create the POSIXct object, I have problems. Here is a toy example created from the actual data which caused the problem. I am using R 2.0.1 on Windows XP. > # Data frame with dates and

I have a SQL Server column named StartTime of (SQL Server) type datetime If I attempt to set the attribute using public def StartTime=(time) write_attribute(:StartTime, "{ts ''1899-12-30 #{time.hour}:#{time.min}:#{time.sec}''}") end it''s inserting a NULL value. Anyone else able to successfully insert a date time value into a SQL Server table using

> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] > On Behalf Of Bryan Keiren > Subject: [LLVMdev] getElapsedWallTime unnecessary heap allocation and memory leak > In the file \lib\Support\Process.cpp on line 60, it seems as though an > unnecessary heap allocation and memory leak occurs. > static TimeValue getElapsedWallTime() { >  static

I have a large dataset (questionnaire results) of mostly categorical variables. I have tested for dependency between the variables using chi-square test. There are an incomprehensible number of dependencies. I used the chaid() function in the CHAID package to detect interactions and separate out (what I hope to be) the underlying structure of these dependencies for each variable. What typically

Hi everybody I am a recent convert from SAS so please excuse me if this is all very obvious: I want to use the runs test {runs.test() in package tseries} to test the randomness of a certain variable in a survey for each interviewer. I tried to us the by() statement but it doesn't seem to work with runs.test() as the function. Here is what I have: Consider a data frame with two variables and

Greetings, I have a csv file of 76 fields and about 4 million records. I know that some of the records have errors - unmatched quotes, specifically.? Reading the file with readLines and parsing the lines with read.csv(text = ...) is really slow. I know that the first 2459465 records are good. So I try this: > startTime <- Sys.time() > first_records <- read.csv(file_name, nrows

Hi everybody. I have a dataframe that contains a factor with the date information in the format like in the example below: "2009/05/12 11:22:31 AM" I have been able to convert it to POSIXt using strptime Now I want to print only the date as one vector and the time in another vector but they must be real date and time classes so that i can use them in calculations to reconstruct my

Hi everybody Im on R version 2.11.1 on Mac OS X I am working through David Kahle's example of using ggplot2 with Rgooglemaps (found here: https://github.com/hadley/ggplot2/wiki/Crime-in-Downtown-Houston,-Texas-:-Combining-ggplot2-and-Google-Maps). Excellent page by the way. I have downloaded the data and the code and want to learn how to do this by first simulating David's results and

Hi Dave, That's rather frustrating. I've found vroom (from the package vroom) to be helpful with large files like this. Does the following give you any better luck? vroom(file_name, delim = ",", skip = 2459465, n_max = 5) Of course, when you know you've got errors & the files are big like that it can take a bit of work resolving things. The command line tools awk

In the file \lib\Support\Process.cpp on line 60, it seems as though an unnecessary heap allocation and memory leak occurs. This is the offending code: static TimeValue getElapsedWallTime() { static TimeValue &StartTime = *new TimeValue(TimeValue::now()); return TimeValue::now() - StartTime; } The issue is that the StartTime variable's value is allocated on the heap, after which a

No idea, but have you tried using ?scan to read those next 5 rows? It might give you a better idea of the pathologies that are causing problems. For example, an unmatched quote might result in some huge number of characters trying to be read into a single element of a character variable. As your previous respondent said, resolving such problems can be a challenge. Cheers, Bert On Mon, Apr 8,

On Wed, Mar 19, 2014 at 6:18 PM, Bryan Keiren < bryan.keiren at guerrilla-games.com> wrote: > We are indeed trying to completely clean the heap before exiting main(). > Which means that you either don't have threads, or you join all threads before main exits. Is that the case? Good for you if so! > > > -----Original Message----- > From: Caldarale, Charles R

Hi, My question is a bit of wonder and a bit of enlightment. I have two models, Channel and ChannelItem, the second is a list of Events, ordered by position (because I''m using acts_as_list). Later I use a method in Channel to recalculate the hour when that show come online, based on the duration of it and doing math based on the previous one duration and start time, starting from