similar to: using character vector as input argument to setkey (data.tablepakcage)

Matthew Dowle wrote: > Hi, > > Try package 'data.table'. It has a concept of keys which allows you to do > exactly that. > > http://datatable.r-forge.r-project.org/ > > Matthew > > Hi Matthew, Unfortunately, the load of that library fails (it builds successfully). I'm currently looking into why. Error output looks something similar to: >

Hi, Have I missed something, or misunderstood? The r-help posting guide asks users to contact the package maintainer : "If the question relates to a contributed package, e.g., one downloaded from CRAN, try contacting the package maintainer first. [snip] ONLY [only is bold font] send such questions to R-help or R-devel if you get no reply or need further assistance. This applies to both

Hi, I've added R_init_data_table to the "data.table" package (which has a dot in its name). This works well in R 2.15.0, because of this from the Writing R Extensions manual : " Note that there are some implicit restrictions on this mechanism as the basename of the DLL needs to be both a valid file name and valid as part of a C entry point (e.g. it cannot contain ?.?): for

Hi, Similar questions have come up before on the list and elsewhere but I haven't found a solution yet. winbuilder's install.out shows data.table's .c files compiled with -O3 on Win32 but -O2 on Win64. The same happens on R-Forge. I gather that some packages don't work with -O3 so the default is -O2. I've tried this in data.table's Makevars (entire contents) : ====

Hi all, Does anyone know a solution for this error ? > tkwidget(dlg, "iwidgets::spinint", range="{0 23}") Error in structure(.External("dotTclObjv", objv, PACKAGE = "tcltk"), class = "tclObj") : [tcl] wrong # args: should be ".31.1.19 configure -range {begin end}". Thanks, Matthew [[alternative HTML version

I use ipsec on my Linux machine (Fedora 2 Core), and controls it using "setkey" scripts. Does anyone knows of a C interface/library that will enable me to control it from C code? The "setkey" C function is something completely different. Yuval Lifshitz CableMatrix Inc. _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl

data.table is an enhanced data.frame with fast subset, fast grouping and fast merge. It uses a short and flexible syntax which extends existing R concepts. Example: DT[a>3,sum(b*c),by=d] where DT is a data.table with 4 columns (a,b,c,d). data.table 1.4.1 : * grouping is now 10+ times faster than tapply() * extract is 100+ times faster than ==, as before * 3 new vignettes: Intro, FAQ

data.table is an enhanced data.frame with fast subset, fast grouping and fast merge. It uses a short and flexible syntax which extends existing R concepts. Example: DT[a>3,sum(b*c),by=d] where DT is a data.table with 4 columns (a,b,c,d). data.table 1.4.1 : * grouping is now 10+ times faster than tapply() * extract is 100+ times faster than ==, as before * 3 new vignettes: Intro, FAQ

Hi, what does this mean? --8<---------------cut here---------------start------------->8--- > graph <- graph.data.frame(merged[!v,], vertices=ve, directed=FALSE) cedta decided 'igraph' wasn't data.table aware cedta decided 'igraph' wasn't data.table aware cedta decided 'igraph' wasn't data.table aware cedta decided 'igraph' wasn't

Hi I followed a railscast episode and got datatables up and running, beautifully along with the nice jquery-ui as in the front page. The main issue I''m having though is that I suck at CoffeeScript/JS ~_~ I''m trying get the datatables to reload every 1 second but I don’t see any request coming into my webserver for refreshes and hence, no refreshes on the web page itself.

Hi, Does anyone have experience using RJDBC library to write to Sybase datatable? The jdbc driver I am using is jConnect 6.0. I can successfully write into a new datatable, but have problem appending rows to existing one. It either complains "Table *** already exists" or simply overwrite the existing one. Here is the example. I am trying to append 'data' to the existing

Hi, all. The previous post have a typo: problem in ARM assembly: I use LDR to load an external symbol : LDR R7,=DataTable But clang gives error: unexpected token in operand to the '=', Then I change the code to: LDR R7,DataTable The error becomes: unsupported relocation on symbol. How can I get around this in clang? My problem is actually how to load external symbol in

data.table offers fast subset, fast grouping and fast ordered joins in a short and flexible syntax, for faster development. It was first released in August 2008 and is now the 3rd most popular package on Crantastic with 20 votes and 7 reviews. * X[Y] is a fast join for large data. * X[,sum(b*c),by=a] is fast aggregation. * 10+ times faster than tapply() * 100+ times faster than == It inherits

data.table offers fast subset, fast grouping and fast ordered joins in a short and flexible syntax, for faster development. It was first released in August 2008 and is now the 3rd most popular package on Crantastic with 20 votes and 7 reviews. * X[Y] is a fast join for large data. * X[,sum(b*c),by=a] is fast aggregation. * 10+ times faster than tapply() * 100+ times faster than == It inherits

Dear R experts, I would really appreciate if you had an idea on how to use more efficiently the aggregate method: More specifically, I would like to calculate the mean of certain values on a data frame,? grouped by various attributes, and then create a new column in the data frame that will have the corresponding mean for every row. I attach part of my code: matchMean <-

Forwarded to R-Help, because I think it could interest people following this thread. Clearly, RServe and svSocket have different goals and very little overlap. Best, Philippe -------- Original Message -------- Subject: Re: Video demo of using svSocket with data.table Date: Wed, 26 Aug 2009 20:34:19 +0100 From: Matthew Dowle <mdowle at mdowle.plus.com> Reply-To: Matthew Dowle

Consider I have the following data: AgeRange AgeOfPerson PersonNo FriendsAtYear0 FriendsAtYear1 FriendsAtYear2 FriendsAtYear3 FriendsAtYear4 FriendsAtYear5 10 - 12 11 1 0 1 2 2 3 3 10 - 12 12 2 0 1 2 2 3 3 15 - 18 13 3 1 2 3 4 6 7 15 - 18 14 4 1 3 4 5 7 7 30 - 40 33 5 3 5 5 6 8 9 30 - 40 36 6 4 4 4 4 4 4 I want to plot the number of friends against number of years, as to show how friendships

Hi, The following function works, but is there a neater way to write it? f = function(x,...) { # return a character vector of the arguments passed in after 'x' gsub(" ","",unlist(strsplit(deparse(substitute(list(...))),"[(,)]")))[-1] } > f(x,a,b,c*d) [1] "a" "b" "c*d" > Thanks. [[alternative HTML

Hi, Please see below for post on r-help regarding data.frame() and the possibility of dropping rownames, for space and time reasons. I've made some changes, attached, and it seems to be working well. I see the expected space (90% saved) and time (10 times faster) savings. There are no doubt some bugs, and needs more work and testing, but I thought I would post first at this stage. Could some

---------- Forwarded message ---------- From: Dr. Venkatesh <drvenki at liv.ac.uk> Date: Sun, May 9, 2010 at 4:55 AM Subject: R apply() help -urgent To: r-help at r-project.org I have a file with 4873 rows of 1s or 0s and has 26 alphabets (A-Z) as columns. the 27th column also has 1s and 0s but stands for a different variable (pLoss). columns 1 and 2 are not significant and hence lets