similar to: assignment by value or reference

Displaying 20 results from an estimated 20000 matches similar to: "assignment by value or reference"

2010 Nov 24
4
R encoding question
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
2011 Mar 09
2
No response after click the "show Rules" button on Tab "Associate".
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
2011 Dec 11
2
as.factor does not work inside function
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)
2012 Jan 19
3
What does the : operator mean in glm formulas
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
2010 Aug 01
3
Can saved R object .RData files be loaded by more than one R sessions for read only purpose?
Especially for large ff objects. Xiaobo.Gu [[alternative HTML version deleted]]
2010 Jul 21
1
Package RPostgreSQL_0.1-6.tar.gz has been checked and built
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
2011 Mar 18
2
Does RHIPE support R on Windows as the user desktop environment?
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
2012 Oct 17
1
What's your opinion about the Transparency Layer feature of Oracle R Enterprise?
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
2010 Aug 01
1
How to create ff objects from database connection
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
2011 Jan 17
3
R vs. C
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
2010 Dec 24
1
How to specify ff object filepaths when reading a CSV file into a ff data frame.
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
2010 Jun 27
2
Ways to work with R and Postgres
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
2010 Aug 01
1
ff objects and ordinary analytical functions.
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]]
2011 Dec 11
2
incomplete final line found warning
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
2010 Nov 10
1
ff objects saving problem
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,
2011 Jun 04
2
Does anybody successfully built latest R on AIX 5.3?
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2001 Jul 02
1
How to reference an R package ?
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
2008 Dec 23
1
MCP51 sound card can be recognized but can't work
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
2009 Jan 08
3
How to select a block in gnome-terminal or in vim
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
2008 Dec 24
4
Please share some RHCE/RHCT learning material
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>