search for: johannesraja

My intention is to give a presentation about R programming language for software developers. I would like to ask, what are the things that make R different from other programming languages? What are the specific cases where Java/C#/Python developer might say "Wow, that was neat!"? What are the things that are easy in R, but very difficult in other programming languages (like Java)?

I have a vector like this: a <- c("thisIsName", "thisIsAlsoName", "andThisName") How to break this into pieces and produce a vector with unique parts: this Is Name Also and This -J

Hi, How can I attach chart/plot to a excel file? I would like to create a plot in R eg. plot(1) and save it into a Excel file, eg. test.xls in a same working directory. Regrads, -J

I have timestamps from mysql database: > dput(tstamp) c(1225221868L, 1225221906L, 1225221906L, 1225230997L, 1225231000L, 1225231003L, 1225231152L, 1225231348L, 1225231351L, 1225231400L ) How to convert these into normal dates? Thanks, jrara

Hi, I have dates in this kind of format (day, month, year): > dput(head(dates, 10)) c("6.4.7", "29.12.98", "19.10.91", "20.6.92", "2.9.3", "23.6.3", "13.7.93", "23.3.7", "26.6.95", "15.2.10") So, as you can see, there is no century. How can I change this character data into dates? Any help

Hi, R contains many good datasets which would be valuable in other platforms as well. My intention is to use R datasets on SQL Server as a sample tables. Is there a package that would do automatic conversion from the dataset "schema" into a SQL Server CREATE TABLE statement (and INSERT INTO statements)? For example. > str(cars) 'data.frame': 50 obs. of 2 variables: $

I have a string like this st <- "SELECT COUNT(empid), COUNT(mgrid), COUNT(empname), COUNT(salary), FROM Employees" How can I remove the last comma before the FROM statement? -J

I would like to learn AsciiDoc. Is there any good examples how to use AsciiDoc with R? I know that there is packages called ascii to do this, but it would be nice to see some examples how AsciiDoc works with R. Is there an AsciiDoc distribution for Max OS X? -Johannes

I'm trying to learn data.table package but I get a following annoying error message: > install.packages("data.table") trying URL 'http://www.freestatistics.org/cran/bin/macosx/universal/contrib/2.10/data.table_1.2.tgz' Content type 'application/x-gzip' length 66823 bytes (65 Kb) opened URL ================================================== downloaded 65 Kb The

Hi, Is there an efficient way recoding variables in a data.frame using base R? My purpose is to create new variables and attach them into old data.frame. The basic idea is shown below, but how to create recoding for A, B and C and assing them into new variables? df <- data.frame(A = c(1:5), B = c(3,6,2,8,10), C = c(0,15,5,9,12)) df$A[df$A <= 3] <- "x" df$A[df$A > 3 &

I would like to know if you have any suggestions how to visualize the results from a paired t-test (see the example data below). I tried to produce plots that show the mean and CI's from the original data and the estimate of the difference between means and the confidence intervals (see below) from the t-test. I really don't know what would be the best way to graphically display the

I have a data set like this in one .txt file (cols separated by !): APE!KKU!684! APE!VAL!! APE!UASU!! APE!PLA!1! APE!E!10! APE!TPVA!17122009! APE!STAP!1! GG!KK!KK! APE!KKU!684! APE!VAL!! APE!UASU!! APE!PLA!1! APE!E!10! APE!TPVA!17122009! APE!STAP!1! GG!KK!KK! APE!KKU!684! APE!VAL!! APE!UASU!! APE!PLA!1! APE!E!10! APE!TPVA!17122009! APE!STAP!1! GG!KK!KK! it contains over 14 000 000 records. Now

Hello, I'm trying to import a SAS file made using SAS on Unix. Currently I'm using SAS on Windows and I'm trying to import that .ssd04 file to R. The file name of the file is testfile.ssd04 and it is located in 'M:\sasuser'. I'm using Windows XP and R 2.91. Basically what I'm doing is ############ r code ############## > library(foreign) > sashome <-

Hi, How to rbind these vectors from a list?: > l <- list(a = c(1, 2), b = c(1, 2, 3)) > l $a [1] 1 2 $b [1] 1 2 3 > do.call(rbind, l) [,1] [,2] [,3] a 1 2 1 b 1 2 3 Warning message: In function (..., deparse.level = 1) : number of columns of result is not a multiple of vector length (arg 1) > -J

I am trying to create a frequency distribution and I am a bit confused. Here are the commands I have entered: > data <- read.csv(file="40609_sortedfinal.csv",head=TRUE,sep=",") > NumberOfActionsByStatus = data$STATUS > NumberOfActionsByUser = data$ETS_LOGIN > NumberOfBidOffer = data$BID_OFFER > NumberOfActionsByUser.freq = table(NumberOfActionsByUser) >

Hi, file.info is producing data.frame with ctime variable. Help file says that on Unix this is 'last status change' and on Windows 'creation time'. Is there a way to get 'last status change' on Windows using some R function? Thanks, Johannes

Hi, Is there a way to get different colour based on group when plotting stripchart? mydata <- data.frame(val1 = c(1.1, 3.2, 4.1, 2.5, 6.2, 5.3, 4.5, 2.2, 4.7, 2.7), val2 = c(4.2, 5.3, 3.4, 2.6, 5.3, 6.2, 7.7, 4.8, 3.4, 2.1), group = rep(0:1, 5)) mydata.stack <- stack(mydata, select=-group) stripchart(values ~ ind, data=mydata.stack, vertical=T, at=c(1.25,

Hi, How do you people avoid copy-pasting and manual editing of the code posted in this list? I mean that if some one post a solution for an answer like this: > a <- 1:10 > a [1] 1 2 3 4 5 6 7 8 9 10 > a[1:5] [1] 1 2 3 4 5 > I have to copy-paste it to e.g. Tinn-R and remove "> " part of the line to try it in my R. When you keep doing this it gets quite

Hi, I'm trying to use Sweave in my .tex-documents using \usepackage{Sweave} notation. I have this line in my .bash_profile export TEXINPUT=.:/Users/jrara/Library/Frameworks/R.framework/Resources/share/texmf:$TEXINPUTS When trying to typeset this .tex document, I get an error message saying ERROR: LaTeX Error: File `Sweave.sty' not found. I tried to google this problem but could not

I have a large dataset and I would like to make some kind of flowchart from this dataset. The idea is to show rowcounts from data subsets: data1 rows= 100000 | / \ / \ males females, rows=500000 rows=500000 /\ / \