Displaying 20 results from an estimated 2000 matches similar to: "Data frame of different sized lists in a function call"
2011 Nov 21
1
Creating a list from all combinations of two lists
R-helpers:
Say I have two lists of arbitrary elements, e.g.:
list1=list(c(1:3),"R is fun!",c(3:6))
list2=list(c(10:5),c(5:3),c(13,5),"I am so confused")
I would like to produce a single new list that is composed of all
combinations of the "top level" of list1 and list2, e.g.:
listcombo=list(list(list1[[1]],list2[[1]]),list(list1[[1]],list2[[2]]
2009 Oct 23
2
splitting a vector of strings...
Quick question -- if I have a vector of strings that I'd like to split
into two new vectors based on a substring that is inside of each string,
what is the most efficient way to do this? The substring that I want to
split on is multiple characters, if that matters, and it is contained in
every element of the character vector.
--j
--
Jonathan A. Greenberg, PhD
Postdoctoral Scholar
2009 Nov 02
2
"Safe" way to automatically install required packages...
R-helpers:
I'm working on an r-package that I want to make as easy-to-use as
possible for a novice R-user, which includes automatically installing
required packages. I, myself, am a novice R-packager, so the solution
I came up with was to embed:
print("Loading required packages...")
if (!require("reshape")) { install.packages("reshape") }
if
2009 Mar 18
2
How do I set the Windows temporary directory in R?
I'm trying to redirect where temporary files go under R to
D:\temp\somerandomname from its default (C:\Documents and
Settings\username\Temp\somerandomname) -- how do I go about doing this?
--j
--
Jonathan A. Greenberg, PhD
Postdoctoral Scholar
Center for Spatial Technologies and Remote Sensing (CSTARS)
University of California, Davis
One Shields Avenue
The Barn, Room 250N
Davis, CA 95616
2009 Aug 27
19
Best R text editors?
Quick informal poll: what is everyone's favorite text editor for working
with R? I'd like to hear from people who are using editors that have
some level of direct R interface (e.g. Tinn-R, Komodo+SciViews). Thanks!
--j
--
Jonathan A. Greenberg, PhD
Postdoctoral Scholar
Center for Spatial Technologies and Remote Sensing (CSTARS)
University of California, Davis
One Shields Avenue
The
2009 Mar 13
2
Using format to add leading zeroes
I have a numerical vector which contains a (poorly) formatted time
column, which, in theory, should be HHMM, but was distributed as an
integer, so, for 12:15 am, it is saved as "15" (e.g. HHMM = 0015 with
the zeroes stripped). I'm trying to use this in conjunction with
strptime, but I'm thinking because each time is an integer ranging from
1 to 4 digits, I probably need to
2011 Aug 23
5
Easier ways to create .Rd files?
R-helpers:
Are there any ways to auto-generate R-friendly (e.g. will pass a
compilation check) .Rd files given a set of .R code? How about GUIs
that help properly format the .Rd files? Thanks! I want a basic set
of .Rd files that I can update as I go, but as with most things my
documentation typically lags behind my coding by a few days.
--j
--
Jonathan A. Greenberg, PhD
Assistant Project
2010 Jan 20
1
x,y plot question (two sets of labels)
I'm trying to figure out the best way to do a scatterplot using the
following data as an example:
plothelp_x=1:10
plothelp_A1=sin(plothelp_x)
plothelp_A2=tan(plothelp_x)
plothelp_B=c("A","B","C","A","B","C","A","B","C","A")
(note that all 4 of these vectors have 10 entries each)
What I would
2009 Oct 28
1
Aggregate and cross tabulation
R-helpers:
I have a data frame containing 4 factor variables (let's say A,B,C,
and D) and 1 numerical variable (N). I would like to produce a
cross-tabulated data frame in which A,B,C are individual columns, each
factor of D is its own column, and the field is calculated as a given
function of N (I would like to have two output data frames, one with the
mean(N) and one with the
2010 Mar 15
1
rbind, data.frame, classes
Hi,
This has bugged me for a bit. First question is how to keep classes with
rbind, and second question is how to properly return vecotrs instead of
lists after turning an rbind of lists into a data.frame
list1=list(a=2, b=as.Date("20090102", format="%Y%m%d"))
list2=list(a=2, b=as.Date("20090102", format="%Y%m%d"))
rbind(list1, list2) #this loses the
2009 Jun 16
2
Statistically detecting thresholds...
Rers:
I have some ecological data (stream velocity vs. % cover of submerged
weeds) that shows strong evidence of a thresholding step-function, e.g.
below some velocity, % cover ranges from 0% to 100% (with no apparent
relationship to velocity within this range of velocities), but above a
certain "threshold" velocity, the % cover does not appear to exceed,
say, 10%. There are good
2009 Apr 07
1
Constrained, multiple response statistics
R'ers:
I was hoping I could get some direction on this. I have a dataset
of the form:
Y1,Y2,...,YM = f(X1,X2,...,XN), where N is >>> M
The response data (Y1,Y2,...,YM) is frequency data, such that the sum of
all Yi = 1.0. Both Xj and Yi are continuous variables.
I'm trying to figure out the best approach(es) to solving for the model
f() -- any ideas? I could solve
2009 Jan 25
2
.Renviron for multiple hardwares...
Our lab has a lot of different unix boxes, with different hardware, and
I'm assuming (perhaps wrongly) that by setting a per-user package
installation directory, the packages will only work on one type of
hardware. Our systems are all set up to share the same home directory
(and, thus, the same .Renviron file) -- so, is there a way to set, in
the .Renviron file, per-computer or
2011 Jun 29
1
Querying the path separator?
Hopefully this is a pretty easy fix -- I need to have R query the path
separator for some code I'm trying to write (it involves using a
system() call) -- the call requires a path and a wildcard, e.g.:
command="mycommand /path/to/*.files" in the case of unix or,
command="mycommand.exe C:\\path\\to\\*.files" on a windows box
System.which is working correctly, so the
2010 Aug 25
2
Removing inter-bar spaces in barchart
Rhelpers:
I'm trying to make a barchart of a 2-group dataset
(barchart(x~y,data=data,groups=z,horizontal=FALSE)). My problem is
that I can't, for the life of me, seem to get rid of the inter-bar
space -- box.ratio set to 10000 doesn't do much. Any ideas? I'd
ideally want zero space between the bars. Thanks!
--j
--
Jonathan A. Greenberg, PhD
Assistant Project Scientist
2010 Feb 26
3
Preserving lists in a function
Dear R users,
A co-worker and I are writing a function to facilitate graph plotting in R. The function makes use of a lot of lists in its defaults.
However, we discovered that R does not necessarily preserve the defaults if we were to input them in the form of list() when initializing the function. For example, if you feed the function codes below into R:
myfunction=function(
list1=list
2012 May 02
6
Quickest way to make a large "empty" file on disk?
R-helpers:
What would be the absolute fastest way to make a large "empty" file (e.g.
filled with all zeroes) on disk, given a byte size and a given number
number of empty values. I know I can use writeBin, but the "object" in
this case may be far too large to store in main memory. I'm asking because
I'm going to use this file in conjunction with mmap to do parallel
2011 Nov 21
3
How do I query "..." in a function call?
This is probably a very noobish question, but if I want to create a
function that allows an undetermined number of, say, numeric vectors to be
fed to it, I would use:
myfunction = function(...)
{
# Do something
}
Right? If so, how do I a) count the number of vectors "fed" to the
function, and b) how do I treat those vectors as variables, e.g. for the
call:
2012 Apr 05
4
Best way to search r- functions and mailing list?
R-helpers:
It looks like http://finzi.psych.upenn.edu/search.html has stopped
spidering the mailing lists -- this used to be my go-to site for
searching for R solutions. Are there any good replacements for this?
I want to be able to search both functions and mailing lists at the
same time. Cheers!
--j
--
Jonathan A. Greenberg, PhD
Assistant Professor
Department of Geography
University of
2007 Jul 05
1
(no subject)
I'm trying to hunt down an appropriate kriging package for my specific
application, and I was hoping someone on the R list might have some pointers
-- I'm interested in performing kriging and related spatial interpolations
with one of the R packages, but I need to be able to provide my own
point-to-point distances (e.g. I do not want to use standard between point
distances, as calculated