similar to: how to use different variable to store values with different length in a loop

Hi, I have a simple question, suppose I have the date "05/16/2008", what would be the command to get the month, day and year? Thanks, -Jack [[alternative HTML version deleted]]

Hi, I am trying to use function pairs to plot the scatterplot, but I only want to keep the upper triangle, what's the argument to do this? Thanks, -Jack [[alternative HTML version deleted]]

Hi, I have a silly question regarding the usage of two commands: read.table and gregexpr： For read.table, if I read a matrix and set header = T, I found that all the dash ("-") becomes dots (".") A = read.table("Matrix.txt", sep = "\t", header = F) A[1,1] # "A-B-C-D". A = read.table("Matrix.txt", sep = "\t", header = T)

Hello, all. With the assistance of very helpful folks, our brand new multi-tenant setup seems to be working smoothly from start to finish with just a bump or two. The biggest is parking. Now that we got most kinks worked out, I'm a little more comfortable in trying to resolve this. There seem to be two problems: 1. Parking assigns parking spaces from the default group no matter

Hi, I am now running a cross-validation using coxph coupled with stepAIC for model selection, is there anyway to suppress the output? It's too much. -Jack [[alternative HTML version deleted]]

Hi, List The elastic net package (by Hastie and Zou at Stanford) is used to do regularization and variable selection, it can also do regression. I am wondering if it can perform binary classification (discrete outcome). Anybody having similar experience? Many thanks, -Jack [[alternative HTML version deleted]]

Dear List, I have an atomic vector named "Results" Results [1] 1 1 1 attr(,"prob") [1] 0.6666667 1.0000000 1.0000000 Levels: 0 1 when I type attributes(Results) $levels [1] "0" "1" $class [1] "factor" $prob [1] 0.6666667 1.0000000 1.0000000 However, when I type Results$prob It has the following warning message: NULL Warning message: In

Hi, After I read an xlsx file into the work space: A <- read.xlsx("B.xls", header = T, check.names = F) There are several headers with the names like: colnames(A) [1:4] # [1] "A 1" "B" [3] "C 2" "D" I can get the content of column 2 and column 4 easily by A$B or A$D However, I can not type

Hello, all. I'm having a deeply frustrating time getting multiple parking lots to work and am wondering what I am doing wrong. I am using Asterisk 1.6.1.1. I defined two separate parking lots in features.conf as follows: [parkinglot_a100] ; SSI context => a100-parking parkpos => 900-920 findslot => next [parkinglot_a10] ; EBC context => a10-parking parkpos => 800-820

??? > y <- sort( c("a1","a2","a10","a12","a100")) > y [1] "a1" "a10" "a100" "a12" "a2" > mixedsort(y) [1] "a1" "a2" "a10" "a12" "a100" **Please read the docs!** They say that mixedsort() and mixedorder() both take a **single

Hi, I have a question about the parameter C (cost) in svm function in e1071. I thought larger C is prone to overfitting than smaller C, and hence leads to more support vectors. However, using the Wisconsin breast cancer example on the link: http://planatscher.net/svmtut/svmtut.html I found that the largest cost have fewest support vectors, which is contrary to what I think. please see the scripts

x <- c( "a1", "a10", "a2" ) y <- c( "b10", "b2", "a12", "ca1" ) DF <- expand.grid( x = x, y = y ) # randomize set.seed( 42 ) DF <- DF[ sample( nrow( DF ) ), ] # missing from gtools mixedrank <- function( x ) { seq.int( length( x ) )[ gtools::mixedorder(x) ] } o <- do.call( order, lapply( DF, mixedrank ) )

I was working with the rmetrics portfolioBacktesting function and dug into the code to try to find why my formula with 113 items, i.e. A1 thru A113, was being truncated and I only get 85 items, not 113. Is it due to a string length limitation in R or is it a bug in the strsplit or gsub functions, or in my string? I'd very much appreciate any suggestions ============Input script:

My users currently have mail delivered to mulitple MailDir locations via procmail. ~/mail/inbox/ ~/mail/graph/ ~/mail/spam/ I would like all these mailboxes to be exported via dovecot IMAP and appear as folders. However, I can't anything beyond the INBOX working. My approach is via 'namespaces'. My config file is changed thusly: $ sudo dovecot -n # 1.0.15:

Hi all, I have a 4 by 100 matrix. I wish to extract each column and make it into a 2 by 2 matrix. I also want to assign names for each 2X2 matrix. For example set.seed(2) a=matrix(rnorm(400),ncol=100) a1=matrix(a[,1],ncol=2) a2=matrix(a[,2],ncol=2) . . . a100=matrix(a[,100],ncol=2) Any simple ideas. Thanks. B -- View this message in context:

Hi Newbie question: I have a set of data frames that I want to do the same calculations on each. I've found out that I can put them in a list and loop through the list to do the calculation, but not put the results back into each data.frame.. For example three data frames cats, dogs, birds where >cats name eats_kg 1 bob 3 2 garfield 4 3 chuck 6 and dogs and birds are similar but not

Hi R programmers, I have stumbled across what seems a very simple problem. My goal is to create a xts time series object which contains vectors as values. In other words, I try to create something like this: 2009-01-01 => c('aa', 'bb', 'dd') ... 2010-02-01 => c('mm') I have figured out parts of separately. Here's what works (new xts time-series with

Greetings, I have been playing around with the R/Parallel package, which can farm out the computation of a for-loop among multiple worker processes. Each worker gets a chunk of the for-loop iterations; for example, if you have two workers and for(x in 1:1000){...}, one worker would typically get iterations 1:500, while the second does 501:1000. I would like to be able to preallocate matrices to

Hi, Searching for functions that would order strings that mix characters and numbers in a "natural" way (ie, "a1 a2 a10" instead of "a1 a10 a2"), I found the mixedsort and mixedorder from the gtools package. Problems: 1- mixedorder does not work in a "do.call(mixedorder, mydataframe)" call like the order function does 2- gtools has not been updated in 2.5

Dear Colleagues. I believe this should be a problem encountered by many: nls( ) is a very useful and efficient function to use if we are just to display the estimated value on screen. What if we need R to store the estimated parameter in a variable? For example: x=rnorm(10, mean=1000, sd=10) y=x^2+100+rnorm(10) a=nls(y~(x^2+para),control=list(maxiter = 1000, minFactor=0.5