similar to: assignment by value or reference

Hi, I am using RpgSQL to retrieve data from a PostgreSQL database wich is with encoding UTF8, and I have some Chinese character in one of the columns, unfortunately R can't show it correctly. > df <- dbGetQuery(con, "select * from test") > df a b 1 1 ????????\xa2 2 2 ???? EURO\xa1 I see the following option, do I need to change the encoding option to show

Hi, I am using Rattle 2.6.4 with R 2.12.2 on win64, is this a bug ? Following is the content after execute the associate analysis process: Summary of the Apriori Association Rules: Number of Rules: 23351 Summary of the Measures of Interestingness: support confidence lift Min. :0.1250 Min. :1 Min. :2.667 1st Qu.:0.1250 1st Qu.:1 1st Qu.:2.667 Median :0.1250

Hi, I am trying to write a function do cast columns of data frame as factor in a loop, the source is : as.factor.loop <- function(df, cols){ if (!is.null(df) && !is.null(cols) && length(cols) > 0) { for(col in cols) { df[[col]] <- as.factor(df[[col]]) } } } source('D:/ambertuil.r') x <- 1:5 y <- 2:6 df <- data.frame(x=x, y=y)

Hi, I see the following is the credit scoreing in R guide : m2<-glm(formula = good_bad ~ checking + duration + history+ purpose +amount + savings + employed + installp + marital + coapp +age + other + depends + telephon + foreign +checking:amount What does checking:amount mean? Regards, Xiaobo Gu

Especially for large ff objects. Xiaobo.Gu [[alternative HTML version deleted]]

Hi Dirk I think there are problems with pg_config, the configure script of RPostgreSQL checks for pg_config and got ¡°checking for pg_config... /usr/bin/pg_config¡±. In Solaris 10u7 X64, three versions of PostgreSQL are installed, there are in /usr/postgres/8.2(8.2.9) and /usr/postgres/8.3(8.3.3), the corresponding bin files are in /usr/postgres/<version>/bin and

Hi, Since we can?t access Google Groups here in China, so please forgive me if anyone has asked this question before. Sincerely Xiaobo Gu

Hi, The Transparency Layer feature of Oracle R Enterprise overcomes the RAM limitation of R, and can take advantage of multiple core processing of the database server by translating R expression into SQL, what about building a open source version of the transparency layer for relational databases? Xiaobo Gu

Hi Does anybody know how to create ff objects with data reading from stream objects, such as data reading from PostgreSQL database through RPostgreSQL. For this purpose although we can save the data to a csv file through external tools and then read it through csv readers, but it requires one more data read and write operation, which is of high I/O cost for large datasets. Xiaobo.Gu

A question, please about development of R packages: Are there any guidelines or best practices for deciding when and why to implement an operation in R, vs. implementing it in C? The "Writing R Extensions" recommends "working in interpreted R code . . . this is normally the best option." But we do write C-functions and access them in R - the question is, when/why is this

Hi, The read.csv.ffdf function in package ff will create the ff object physical file in the default directories, I am trying to let the files created in the paths users specify, I think the point is to make use of the asffdf_args parameter, I have a test CSV file named D:\rtemp\fftest.csv, the content of the file is as following: col1,col2,col3 1,"amber",2.4 2,"linda",4.5

Hi, I post this message to the general r-help list hoping anyone within a wider range have suggestions: There are three ways to integration R and postgres, especially on 64bit Microsoft windows Platform, 1. via RODBC package, which has 32 bit and 64 bit version for windows 2. via RPostgres interface, which only has 32bit version currently 3. via plr for Greenplum, which only supports a

Hi, Can the plenty of analytical functions provided by base R and contributed packages be called with ff objects as parameters directly, or do we have to write special version of the functions for ff objects? If it is the latter case, is there a list of functions which support ff objects already. Xiaobo.Gu [[alternative HTML version deleted]]

Hi, I saved the following as a UTF-8 encoded file named amberutil.r as.factor.loop <- function(df, cols){ if (!is.null(df) && !is.null(cols) && length(cols) > 0) { for(col in cols) { df[[col]] <- as.factor(df[[col]]) } } df } And got this warning message, > source('D:/ambertuil.r') Warning message: In readLines(file) : incomplete final line

Hi, I am running the examples in page 70 of the ff package document, but it failed with the following error > cat("let's create some ff objects\n") let's create some ff objects > n <- 8e3 > a <- ff(sample(n, n, TRUE), vmode="integer", length=n, filename="d:/tmp/a.ff") > b <- ff(sample(255, n, TRUE), vmode="ubyte", length=n,

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Hi Once more I have doubts about references. I want to give a reference of the packages I've used (gss, MASS, geoR). For the gss package I'm using @TechReport{gss00, Author = {Chong Gu}, Title = {The gss package}, Institution = {CRAN}, year = 2000, month = {22 } # dec, } and something similar for the others, but this doesn't look

Hi all, I recently install CentOS 5.2 on my Asus Z99M laptop, everything seem to works fine but there is some problem with the sound card. The system can recognized the hardware and I can even run the Realplayer for linux without any error messages, but it can't make any sound, or even noise. I have googled a lot but still can't get it work. Will anyone please guide me to solve this

Hi, When I connect to a Cisco router and issue the show ip interface command, the output is similar as follows: Interface IP-Address OK? Method Status Protocol Ethernet0/0 192.168.12.1 YES NVRAM up up Serial0/0 unassigned YES NVRAM administratively down down Ethernet0/1 unassigned YES NVRAM administratively down

Hi all, will anyone please share me some material on RHCE/RHCT, I am fighting for the Quality Engineer in RedHat, and that may help a lot in the coming written exam. Many thanks and Merry Christmas! Cheers, Xiaobo -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20081224/57086264/attachment-0003.html>