similar to: X-axis with POSIXct dates

Prof. Ripley has provided very helpful information regarding X-axis labeling with POSIXct-class dates. Now I've run into another bit of problematic behavior. I'm running R 1.3.0 on Windows NT 4.0. When I create a plot with the optional argument xaxt = "n", and the X axis is generated from dates of class POSIXct, the X axis is plotted. Obviously, I'd like to prevent the X

I wrote a simple log likelihood (for the ordinary least squares (OLS) model), in two ways. The first works out the likelihood. The second merely calls the first, but after transforming the variance parameter, so as to allow an unconstrained maximisation. So the second suffers a slight cost for one exp() and then it pays the cost of calling the first. I did performance measurement. One would

I'm trying to write a function to find the means over factors of the responses in a mlm (something I would do easily in SAS with PROC SUMMARY). The not-working stub of a function to do what I want is below, and my problem is that I don't know how to call aggregate (or some other function) in the context of terms in a linear model extracted from a lm/mlm object. means.mlm <-

I'm pleased to announce that my employer, Becton Dickinson, has an open position for software implementation in the Matlab and S languages. If interested, send a cover letter and resume (or CV) to Dr. Richard Moore at richard_moore at bd.com. If you have questions, contact myself (at jim_garrett at bd.com) or Dr. Moore. Below find a position description. Jim Garrett Becton Dickinson

How do I retain "POSIXct" formatting when using apply, with FUN=max? #example: mydata <- rep(Sys.time(), 10) mydf <- data.frame(matrix(data=mydata, nrow=2, ncol=length(mydata) ) ) for(i in seq(mydf))class(mydf[[i]]) <- class(mydata) str(mydf) maxdates <- apply(mydf,2,max,na.rm=T) str(maxdates) #Why is the formattign now "chr", and not

I'm using R 1.9.1 on suse server v9 enterprise with the gee package version 4.13-10. I have code that runs in an automated script. It uses the gee function from the gee package. The script is run quite often without error. I have a problem where the script locks up R when calling this function (it starts execution and never finishes). I was able to track down the offending data and determine

I tried toy problems and there doesn't seem to be a basic problem between lm() and ts objects: X = data.frame(x=c(1,2,7,9), y=c(7,2,3,1)) lm(y ~ x, X) X <- lapply(X, function(x) ts(x, frequency=12, start=c(1994,7))) lm(y ~ x, X) and this works fine - whether you do an lm() before or after making ts objects, it's okay. But I have a situation where things aren't okay.

I'm running into problems with set.seed--maybe I'm misunderstanding something. I'm running R 1.5.1 on Windows 2000. I'm basically trying to capture the random seed so that I can reproduce a simulation if it's necessary later. Using set.seed, I can certainly get reproducible results, but not the results I get on the first pass. Here's an example: # Generate a random

On 2016-05-25 19:13, Kelly Lesperance wrote: > Hdparm didn?t get far: > > [root at r1k1 ~] # hdparm -tT /dev/sda > > /dev/sda: > Timing cached reads: Alarm clock > [root at r1k1 ~] # Hi Kelly, Try running 'iostat -xdmc 1'. Look for a single drive that has substantially greater await than ~10msec. If all the drives except one are taking 6-8msec, but one is very

Dear all, how come the first loop in the below fails, but the second performs as expected? days <- as.Date( c("2000-01-01", "2000-01-02") ) for(day in days) { as.POSIXct(day) } for( n in 1:length(days) ) { show(as.POSIXct(days[n])) } Many thanks, Jo [[alternative HTML version deleted]]

Hi, when I type in these words: > a=c("2011-06-01 17:21:24.83", "2011-06-01 17:21:24.283") > as.POSIXct(a) the real output is: [1] "2011-06-01 17:21:24.830 CST" "2011-06-01 17:21:24.283 CST" rather than the expected one: [1] "2011-06-01 17:21:24.083 CST" "2011-06-01 17:21:24.283 CST" How can I deal with such

It took me some time to realize this annoying behavior was coming from lubridate. Perhaps this behavior is unexpected a result of cursory knowledge of it.... ## The expected behavior > sometimes=c(0,1,2,3)*60*60*24 > as.POSIXct( sometimes, origin='1970-01-01', tz='GMT') [1] "1970-01-01 GMT" "1970-01-02 GMT" "1970-01-03 GMT" "1970-01-04

Can someone, please, explain the difference in as.POSIXct results before 1970 and on and after 1970 as illustrated below. After 1970, the use of 'EST' or "EST+5EDT' as the timezone does not affect the result of asPOSIXct, but before 1970 on 10/28 the results are different. > as.POSIXct('1970-10-29', tz='EST')+1 [1] "1970-10-29 00:00:01 EST" >

Hi, search on web indicates that R also includes a hist method on POSIXct vectors. My (perhaps too unexperienced) approach below yields an error. Could somebody give me a hint what's wrong ? Peter > str(samples) `data.frame': 7500 obs. of 1 variable: $ DateTime:'POSIXct', format: chr "2006-07-20 00:10:08" "2006-07-20 00:11:17" "2006-07-20

Hi! I'm confused by this: > as.numeric(as.POSIXct(518400,origin="2001-01-01")) [1] 978822000 I guess the problem is that as.numeric() assumes a different origin, but cannot find any default origin. How can I get back the seconds from the POSIXct format? In other words, which the inverse function of as.POSIXct()? I've tried as.numeric and unclass() using a origin=

Hi there fellow R-users, I have just upgraded to R version 1.9.0 from R version 1.7.1 for Windows. Im trying to use the loess smoother where the X-variable is an as.POSIXct variable. The following works fine with R1.7.1 but not with R1.9.0. Here is the example: dates<-c('2003-08-03','2003-08-10','2003-08-17','2003-08-24','2003-08-31','2

What is the recommended way to convert/coerce and integer to a POSIXct please? d <- as.POSIXct(Sys.Date()) i <- as.integer(d) as.POSIXct(i) Error in as.POSIXct.default(i) : do not know how to convert 'i' to class "POSIXlt" This appears to be the behaviour in 2.3.1 and 2.4.0 on windows XP. I have tried searching on this and found as.Date.integer in package zoo which

Hi, I posted in R-devel, thinking it might be a general R problem, but Uwe cannot reproduce it in his GNU/Linux distro, with the same R version. So I'm posting here to ask whether Debian R users are having this problem. I'm getting a segmentation fault as follows: ---<--------------------cut here---------------start------------------->--- R> begt <-

I am having problems using merge with all = TRUE when one of the dataframes has objects of class POSIXct. Here is an example: > version _ platform sparc-sun-solaris2.6 arch sparc os solaris2.6 system sparc, solaris2.6 status major 1 minor 3.0 year 2001

Full_Name: Philip Gross Version: 1.9.0 OS: Linux Redhat 9.0 Submission from: (NULL) (65.57.245.11) Among the many conversions for POSIXct values, there does not seem to be one which will accept an actual POSIX timestamp, e.g. as produced by MySQL's UNIX_TIMESTAMP() function. I have fixed this by adding the following lines to R-1.9.0/src/library/base/R/datetime.R , at line 89: