search for: xiaobo

...y. > 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 the corresponding texts? In my case how to set? $encoding [1] "native.enc" Thanks, Xiaobo Gu

...e ... done [0.00s]. checking subsets of size 1 2 3 4 5 6 7 8 9 10 done [0.00s]. writing ... [23351 rule(s)] done [0.00s]. creating S4 object ... done [0.01s]. Time taken: 0.01 secs Rattle timestamp: 2011-03-09 23:00:14 dell ====================================================================== Xiaobo Gu

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

...uot;x")) But after the function call, the df data frame does not change, because is.factor(df[["x]]) FALSE But if I call this in R console directlly, it works for(col in c("x","y")){df[[col]] <- as.factor(df[[col]])} is.factor(df[["x]]) FALSE Regards, Xiaobo Gu

...yer 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 problem, step by step or just give me some reference. I will provide any information needed. Many thanks! Cheers, Xiaobo -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20081223/d2f31c80/attachment-0003.html>

...unassigned YES NVRAM administratively down down Loopback0 1.1.1.1 YES NVRAM up up Will anyone please tell me how to select text in block instead of line, so that I can get the IP address on all interface, in gnome-terminal as well as in vim. Many thanks! Xiaobo -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20090108/8a195a1f/attachment-0004.html>

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>

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

...and /usr/postgres/<version>/bin/amd64, and the libraries in /usr/bin is 8.1.11 and it seems a 32bit one, and I can¡¯t find the 64bit version bins for 8.1.11. I'll try uninstall 8.1.11 and install 8.2.9, and my question is how to let RPostgreSQL configure script find the 64bit pg_config. Xiaobo Gu On Tue, Jul 20, 2010 at 10:32 PM, ¹ËС²¨ <guxiaobo1982@gmail.com> wrote: > Hi Dirk, > > I think this discussion should help : > http://stackoverflow.com/questions/1836333/how-can-i-compile-64-bit-postgres-bindings-for-perl-on-solaris, > are there environment variables I ca...

..., 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 [[alternative HTML version deleted]]

...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]]

...ment; and it is by reference when referencing container sub-objects of container objects, such as elements of List objects and row/column objects of DataFrame objectes; but it is by value when referencing the smallest unit of element of a container object, such as cell of data frame objects. Xiaobo.Gu [[alternative HTML version deleted]]

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

...gth(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 found on 'D:/ambertuil.r' Can you help with this? Regards, Xiaobo Gu

..., 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

...has length > 1 and only the first element will be used My questions are: 1. What's the datatype of the col_args parameter of the as.ffdf function 2. If I can make layout of the asffdf_args parameter correct, how can I set the exact filenames for each column of the ff data frame. Regards, Xiaobo Gu

...at > r-devel-owner@r-project.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of R-devel digest..." > > > Today's Topics: > > 1. RPostgreSQL 0.1.7 for Windows 64 causes R.2.12.1 Win64 crash > (Xiaobo Gu) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 15 Jan 2011 10:34:55 +0800 > From: Xiaobo Gu <guxiaobo1982@gmail.com> > To: r-devel@r-project.org > Subject: [Rd] RPostgreSQL 0.1.7 for Windows 64 causes R.2...

...9; not found Does it mean I have to install some special softwares for zip and unzip operation. Another question is whether ff always create physical files for vectors, I found when a ff ffdf object is created, the number of physical files created is eaqual to the number of data frame columns. Xiaobo.Gu

...es interface, which only has 32bit version currently 3. via plr for Greenplum, which only supports a few kinds of functionality, and supports only specific versions of R. Do you have any idea about the advantages and disadvantages of each, and the differences among them Your sincerely Xiaobo.Gu [[alternative HTML version deleted]]

...huoyao Zhang (University of Pennsylvania); Ludmila Cherkasova (Hewlett-Packard Labs); Abhishek Verma (University of Illinois at Urbana-Champaign); Boon Thau Loo (University of Pennsylvania) AROMA: Automated Resource Allocation and Configuration of MapReduce Environment in the Cloud Palden Lama, Xiaobo Zhou (University of Colorado at Colorado Springs) 3:30PM - 4:00PM Break 4:00PM - 5:15PM Short Papers I Locomotion at Location: When the Rubber hits the Road Gerold Hoelzl, Marc Kurz, Alois Ferscha (Johannes Kepler University Linz, Austria) An Autonomic Resource Provisioning Framework for Mob...