Displaying 20 results from an estimated 3000 matches similar to: "data.frame extracting data row-wise"
2013 Feb 08
3
Border width on symbols plotted with the lattice package
Dear list members,
I can't figure out how get 'xyplot' or 'dotplot' in the 'lattice'
package to respect the 'lwd' value for specifying the border with for
*symbols* (for lines it works fine). Example:
-----
# Base graphics works fine (gives a 'fat? circle)
plot(5, cex=10, pch=21, lwd=10)
# But 'xyplot' or 'dotplot' doesn't
2009 Oct 05
2
Long for Loop- calling C from R - Parallel Computing
Hello everyone,
I'm running the following for loop to generate random variables in chunks of
60 at a time (l), here h is of order in millions (could be 5 to 6 millions),
note that generating all the variables at once could have an impact on the
final results
for(j in 1:h){
dat$t.o[seq(0,g1,l)[j]+1:l]<-dat$mu[seq(0,g1,l)[j]+1:l] +
rnorm(l,0,dat$g.var[seq(0,g1,l)[j]+1:l])
}
Is there any
2009 Nov 13
4
processing log file
Dear all, I'm trying to process a log file which logs the date, the username and the computer number accessed. The table looks like this:
>table.users
Date UserName Machine
1 2008-11-25 John 641
2 2008-11-25 Clive 611
3 2008-11-25 Jeremy 641
4 2008-11-25 Walt 722
5 2008-11-25 Tony 645
6 2008-11-26 Tony 645
7 2008-11-26
2009 Nov 25
1
Kerning issues with CairoPDF
Dear list members
I'm using CairoPDF to generate PDF (because of its font embedding and
support for transparent colours). However, at least on my (Windows)
system, the text it outputs seems to have completely wrong kerning.
Here's an example:
CairoPDF("test.pdf")
plot(rnorm(100),xlab="Ovreset")
dev.off()
The v is (slightly) too far away from the O, it's much
2009 Dec 10
2
R on Windows crashes when using certain characters in strings in data frames (PR#14125)
Full_Name: Karl Ove Hufthammer
Version: 2.10.0
OS: Windows XP
Submission from: (NULL) (93.124.134.66)
I have found a rather strange bug in R 2.10.0 on Windows, where the choice of
characters used in a string make R crash (i.e., Windows shows a dialogue saying
that the application has a problem, and must be closed).
I can reproduce the bug on two separate systems running Windows XP, and with
2009 Oct 19
2
Possible bug in plot.POSIXct regarding x axis
I believe I have found a bug (or at least a misfeature) in plot.POSIXct.
See the following example code.
set.seed(1)
x=seq(1,1e8,length=100)+round(runif(100)*1e8)
y=as.POSIXct(x,origin="2001-01-01")
plot(y)
This plots some random (date)times against their indices. The y axis
correctly shows appropriate values (years), but the x axis contains the
single number '59:58' in the
2006 Sep 12
1
lattice cloud and conditional axis limits
I'm using the 'cloud' function in the 'lattice' package to produce
multi-panel 3D scatter plots. The range of the values used vary much
between each panel (especially on the z axis), so I wish the axis limits
to be calculated based on the (conditional) data.
Here's a minimal example:
library(lattice)
z=1:200
x=runif(200)
y=runif(200)
s=factor(rep(c(1,2),each=100))
2009 Oct 30
1
Applying a function on n nearest neighbours
I'm having a problem where I have to apply a function to a subset of a
variable, where the subset is defined by the n nearest neighbours of a
second variable.
Here's an example applied to the 'iris' dataset:
$ head(iris)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4 0.2 setosa
2 4.9 3.0 1.4
2011 Feb 02
3
Applying multiple functions to one object
Dear list members,
I recall seeing a convenience function for applying multiple functions to
one object (i.e., almost the opposite of 'mapply?) somewhere.
Example: If the function was named ?fun? the output of
fun(3.14, mode, typeof, class)
would be identical to the output of
c(mode(3.14), typeof(3.14), class(3.14))
Is my memory failing me, or does such a function already exists in a
2009 Dec 07
1
Subset of time observations where timediff > 60 secs
Dear list members
I have a rather large vector (part of a data frame) giving the time
(date + time, POSIXct) of observations. The times are irregular (with
both small and large jumps) but increasing, and there are several
millions of them.
I now wish to reduce my data set, so that I only have observations which
are at least (for example) 60 seconds apart. Basically, I need (all) the
indices
2009 Oct 01
2
(no subject)
Hi,
Does anyone know where the following package is available:
Holleczek B, Gondos A, Brenner H.
PeriodR - an R package to calculate long term survival estimates using period analysis.
Methods of Information in Medicine 2009; 48: 123-128.
Thanks
Jens Oehlschl?gel
--
GRATIS f?r alle GMX-Mitglieder: Die maxdome Movie-FLAT!
2013 Jan 14
1
Tukey HSD plot with lines indicating (non-)significance
Dear list members,
I'm running some tests looking at differences between means for various
levels of a factor, using Tukey's HSD method.
I would like to plot the data as boxplots or dotplots, with horizontal
significance lines indicating which groups are statistically
significantly different, according to Tukey HSD. Here's a nice image
showing an example of such a graphical
2010 Apr 13
1
vegan (ordisurf): R² for smoothed surfaces
Dear r-helpers,
I just read in an article by Virtanen et al. (2006) where vegetation-environment relationships are studied by fitting smoothed surfaces on an NMDS ordination using GAMs (Wood 2000). The authors describe, that they used R? as goodness-of-fit statistic, which they compare to the R? of fitted vectors. Calculations were carried out using the package vegan (Oksanen).
I know that I can
2012 Sep 05
2
POSIXlt and daylight savings time
I have a data frame that contains dates, but when I use as.POSIXlt() I lose
the hours on all records. I traced this down to a particuar hour which
causes the issue...
> as.POSIXlt('2004-10-31 02:00:00')
[1] "2004-10-31"
> as.POSIXlt('2004-10-31 03:00:00')
[1] "2004-10-31 03:00:00"
How do I tell as.POSIXlt() to ignore daylight savings and just convert to
2012 Aug 18
1
Parameter scaling problems with optim and Nelder-Mead method (bug?)
Dear all,
I?m having some problems getting optim with method="Nelder-Mead" to work
properly. It seems like there is no way of controlling the step size,
and the step size seems to depend on the *difference* between the
initial values, which makes no sense. Example:
f=function(xy, mu1, mu2) {
print(xy)
dnorm(xy[1]-mu1)*dnorm(xy[2]-mu2)
}
f1=function(xy) -f(xy, 0,
2013 Jan 15
2
Sparse dataframes?
Dear Folks--
Is there a data frame analog to sparse matrices? I am working with a panel
data set that has a large number of variables that are redefined repeatedly
or exist for only a few years (out of 48). In my current structure, where
variables are columns and rows are years, more than 90 percent of the cells
and more than 3/4 of the total size of my file are NAs.
I am wondering if there is
2009 Nov 11
2
partial cumsum
Hello,
I am searching for a function to calculate "partial" cumsums.
For example it should calculate the cumulative sums until a NA appears,
and restart the cumsum calculation after the NA.
this:
x <- c(1, 2, 3, NA, 5, 6, 7, 8, 9, 10)
should become this:
1 3 6 NA 5 11 18 26 35 45
any ideas?
thank you and best regards,
stefan
2011 Jan 21
1
match function causing bad performance when using table function on factors with multibyte characters on Windows
[I originally posted this on the R-help mailing list, and it was suggested that R-devel would be a better
place to dicuss it.]
Running ?table? on a factor with levels containing non-ASCII characters
seems to result in extremely bad performance on Windows. Here?s a simple
example with benchmark results (I?ve reduced the number of replications to
make the function finish within reasonable time):
2010 Jul 20
3
pci.backhide
Hello List
If i have a PCI=[08:00.0](example) in any DomU config file
the xm shutdown <ID> shuts down this DomU and the Dom0!
Otherwise i shutdown this DomU from inside the DomU with halt or shutdown -r now, the Dom0 shuts down to.
This happend on Xen 3.4.2 and Xen 4.0 (Kernel 2.6.18.8-xen, 2.6.18.8-xen0)
The Operating System to Compile xen was Debian Lenny and the Dom0 os.
Without
2010 Jun 23
2
step-to-step Installation Guide
Hello,
I'm new here, and I'm from Germany, so please be patient with me because my English is not so good ;)
I am searching for a Step-to-Step Guide to first-configure Dovecot.
I want to create virtual Users wich can logon to my Server to a Webinterface to call theire mails.
I think IMAP is the right protokoll but it should be safe, so i think IMAPs is better.
Unfortunately I am not