Displaying 20 results from an estimated 20000 matches similar to: "dev.ask"
2000 Dec 20
2
Names
I am trying to create a set of vectors which have similar names. They have
a common part and an extra unique part. I am sure I have seen questions on
this before but I have been unable to find it in the archive. There are
examples of sets of names for columns of a data frame, but not for
individual vectors.
Suppose I want vectors named myvar.1 myvar.2 etc.
I tried:
>
2011 Jan 24
2
Help with expression
I have a problem with expressions. I am trying to create a title where
the parameter of interest is displayed as a Greek character. Which
parameter is being considered is stored in a character variable.
As an example, if I have
param <- "alpha"
and then do
plot(0, 0, main = bquote(Parameter==.(param)))
then in the title I get "Parameter = alpha",
whereas I want the
2009 Aug 12
3
Combinatorial problem
I have been struggling trying to write some code to produce all
combinations subject to some restrictions. I thought someone might have
some bright ideas.
I have 11 values which fall into 5 groups. I want all combinations of
2,3, and 4 values where each value must be from a different group. The
numbers in the groups are different. Here is a definition of the groups:
groups <- list(gp1 =
2009 Feb 23
3
Dates and times from Excel
I have used xlsReadWrite to read data from an Excel spreadsheet.
I had a problem with converting times of the day so that I could create
POSIXct date-time objects. I was wondering if there was a better
solution.
Excel stores times of the day as fractions of a day so I wrote a function
to convert the fraction to a number of seconds, extract the hours, minutes
and seconds and output it in ISO
2010 Sep 09
6
Reproducible research
I am investigating some approaches to reproducible research. I need in
the end to produce .html or .doc or .docx. I have used hwriter in the
past but have had some problems with verbatim output from R. Tables are
also not particularly convenient.
I am interested in R2HTML and R2wd in particular, and possibly odfWeave.
Does anyone have sample documents using any of these approaches which
2010 Jan 25
2
Microsoft SQL Server and R
I have a client running Microsoft SQL Server. I am interested in ways of
accessing data from this server using R.
I would welcome any information about how this can be done. I have a
reasonable grasp of SQL and have experience with MySQL and RODBC but
don't know anything much about Microsoft SQL Server.
David Scott
--
_________________________________________________________________
2011 Sep 28
1
Printing an xtable with type = html
I have been playing around with producing tables using xtable and the
type = "html" argument when printing. For example, if xtbl is the output
of a dataframe which has been run through xtable, using the command:
print(xtbl, type = "html",
html.table.attributes = "border = '1', align = 'center'")
I would be interested to see other examples of
2009 Dec 16
1
Stata files
I have a client who uses Stata 11.
Can anyone advise me on ways of transferring data from this version of
Stata to R?
Reading the documentation for read.dta in package foreign it seems it
only allows for versions up to Stata 10. I don't know Stata at all but a
bit of poking around on their website led me to believe Stata 11
couldn't write in Stata 10 format. However Stata 11 can
2010 Dec 22
2
License statement
I am writing a package for a company for its internal use only.
What is an appropriate license statement for the DESCRIPTION file?
I would like a statement which reflects the private and proprietary
nature of the package, giving copyright to the writer and the company. I
also don't want to violate the licensing of R and the packages I am
using (RODBC, ggplot2, zoo).
David Scott
--
2009 Feb 03
2
Lattice histogram with vertical lines
I would like to add some vertical lines to a lattice plot of histograms.
What I am after is a lattice version of abline(v = 1234). The lattice
histogram plot is just:
histogram( ~ LTSE | approach, data = arrivals)
Can anyone point me in the right direction for this?
David Scott
_________________________________________________________________
David Scott Department of Statistics
The
2009 Nov 20
1
Bessel function with large index value
I am looking for a method of dealing with the modified Bessel function
K_\nu(x) for large \nu.
The besselK function implementation of this allows for dealing with
large values of x by allowing for exponential scaling, but there is no
facility for dealing with large \nu.
What would work for me would be an lbesselK function in the manner of
lgamma which returned the log of K_\nu(x) for large
2005 May 31
2
POSIX problem
I am having trouble with creating a POSIXct object. If I create a variable
of class Date first out of the date part of my data, I am ok, but if I
just paste the date and time parts together and try and create the POSIXct
object, I have problems.
Here is a toy example created from the actual data which caused the
problem. I am using R 2.0.1 on Windows XP.
> # Data frame with dates and
2004 May 06
3
strptime
Delving into the murky world of dates and times I found this:
dates <- c("02/27/92", "02/27/92", "01/14/92", "02/28/92", "02/01/92")
> times <- c("23:03:20", "22:29:56", "01:03:30", "18:21:03", "16:56:26")
> x <- paste(dates, times)
> z <- strptime(x, "%m/%d/%y
2005 Oct 31
2
Help with try or tryCatch
I am having trouble with try and tryCatch.
I have read the documentation but I just don't get it.
Here is what I am trying to do. I am testing a function which has a number
of parameters. I want to test it for different values of the parameters
and I have some loops, in the middle of which is a test of the function.
Sometimes the routine fails and so I have put the bit that might fail
2007 Jun 11
1
Recoding
I want to do some recoding of variables: code Age into groups and recode a
factor into a smaller number of levels.
There are a couple of options for recode functions, in the car package and
in memisc, and I think in gmisc.
Does anyone have any opinions on the the easiest, most reliable approach
for these problems?
David Scott
_________________________________________________________________
2008 Jan 27
2
[OT] Open source archive program on windows
I am looking for a recommendation for an open source competitor to Winzip.
I seem to recall Brian Ripley mentioning one in the last year or so, but
couldn't find it in the mail archives. (Searching on Ripley there is
somehow not terribly useful.)
Suggestions?
David Scott
_________________________________________________________________
David Scott Department of Statistics, Tamaki Campus
2000 Dec 12
0
Off-topic---hardware
Sorry to be completely off topic here, but I know there will be many list
members who have an interest in and knowledge of hardware.
We have for some time used Sun hardware for our departmental servers, most
recently Sun Ultras of various specifications, running Solaris. We share
some hardware with Mathematics as well.
The applications we use are the usual suspects:
R (obviously), S-PLUS, the
2010 Jun 18
3
Use of .Fortran
I have no experience with incorporating Fortran code and am probably
doing something pretty stupid.
I want to use the following Fortran subroutine (not written by me) in
the file SSFcoef.f
subroutine SSFcoef(nmax,nu,A,nrowA,ncolA)
implicit double precision(a-h,o-z)
implicit integer (i-n)
integer l,i,nmax
double precision nu,A(0:nmax,0:nmax)
A(0,0) =
2010 Jun 18
3
Use of .Fortran
I have no experience with incorporating Fortran code and am probably
doing something pretty stupid.
I want to use the following Fortran subroutine (not written by me) in
the file SSFcoef.f
subroutine SSFcoef(nmax,nu,A,nrowA,ncolA)
implicit double precision(a-h,o-z)
implicit integer (i-n)
integer l,i,nmax
double precision nu,A(0:nmax,0:nmax)
A(0,0) =
2001 Oct 18
1
tapply problem
Hello everybody.
I have a question that has stumped me and the usual "apply" tricks
don't seem to work. I run a course where each student's performance
is marked by one or more assessors.
I have a data frame containing students' names, assessors' names and
their marks, arranged as follows:
ID student assessor Q1A Q1B Q1C Q2A Q2B Q3
1 2152833