Displaying 20 results from an estimated 600 matches similar to: "optim with contraints"
2003 May 20
4
Output to connections
In the document "R Data Import/Export", section "Output to connections",
there is the following portion of code:
## convert decimal point to comma in output, using a pipe (Unix)
zz <- pipe(paste("sed s/\\./,/ >", "outfile"), "w")
cat(format(round(rnorm(100), 4)), sep = "\n", file = zz)
close(zz)
## now look at the output
2006 Jan 23
1
mutlivariate normal and t distributions
Dear R-help list members,
I have created a package 'mnormt' with facilities for the multivariate
normal and t distributions. The core part is simply an interface to
Fortran routines by Alan Genz for computing the integral of two
densities over rectangular regions, using an adaptive integration
method. Other R functions compute densities and generate random
numbers.
The starting
2003 Feb 04
1
downloaf.file
Dear List-members,
to download a file from the net, the function download.file(..)
does the job. However, before embarking on the download, I would
like to find out how large the file is. Is there a way to know it?
Most easily, this question has been asked before, but I am new to
the list.
Regards, with thanks in advance,
Adelchi Azzalini
----
Adelchi Azzalini <azzalini at
2017 Nov 17
2
HTML documentation is not in the expected location
Since I have updated my Linux system, and consequently re-installed R, I
am unable to see HTML documentation which I used to access via a web
browser. To be more specific, my R installation is declared to be here:
> R RHOME
/usr/local/lib/R
However, if I look at a location such as
/usr/local/lib/R/library/base/html
this contains only two entries
File: 00Index.html
File: R.css
2011 Jan 16
1
\examples{} in Rd file
[Hope this is the right list where to send...]
An attempt to update package 'mnormt' involves the addition of a
small new function called 'pd.solve'. When I come to the package
checking stage, an error occurs in parsing pd.solve.Rd.
The full transcript of the outcome is copied below (it includes details
on my installation) but the critical point is where the \examples{}
section
2017 Nov 17
0
HTML documentation is not in the expected location
On 17/11/2017 10:47 AM, Adelchi Azzalini wrote:
> Since I have updated my Linux system, and consequently re-installed R, I
> am unable to see HTML documentation which I used to access via a web
> browser. To be more specific, my R installation is declared to be here:
>
> > R RHOME
> /usr/local/lib/R
>
> However, if I look at a location such as
>
2008 Dec 11
2
how to get the CDF of a density() estimation?
Hi,
I've estimated a simple kernel density of a univariate variable with
density(), but after I would like to find out the CDF at specific
values.
How can I do it?
thanks for your help, with it I am very close to finish my first
little bit more serious work in R,
Viktor
2010 May 21
0
a matter of etiquette/Fw: dmvsnorm & mvst in fMultivar
AA> In 2008, I have spotted some errors in a package, one which is
AA> likely to have many users (I am not one myself). The more serious
AA> errors are in the documentation, since they lead to a completely
AA> distorted interpretation of the outcome; in addition, there is (at
AA> least) one programming error which produces some wrong
AA> computations. A few weeks later, the
2003 Apr 24
5
Fast R implementation of Gini mean difference
I have written the following function to calculate the weighted mean
difference for univariate data (see
http://www.xycoon.com/gini_mean_difference.htm for a related
formula). Unsurprisingly, the function is slow (compared to sd or mad)
for long vectors. I wonder if there's a way to make the function
faster, short of creating an external C function. Thanks very much
for your advice.
gmd
2001 Mar 01
1
docs + packages (PR#858)
# Your mailer is set to "none" (default on Windows),
# hence we cannot send the bug report directly from R.
# Please copy the bug report (after finishing it) to
# your favorite email program and send it to
#
# r-bugs@r-project.org
#
######################################################
Today I have installed R 1.02.1 on my MSW-95 laptop;
it essentially worked, but thre are two
2007 Apr 04
0
to findout maximized log likelihoods by using rlarg.fit (for several r order statistics)
Dear R helpers,
I need to find out maximized log likelihoods,
parameters estimates and standard errors (in
parentheses) of r largest-order statistics model, with
different values of r by using the function rlarg.fit.
I want to specify required number of order statistics
to the model. I attached my data file with this
mail.please help me.
Ruposh
--- r-help-request at stat.math.ethz.ch wrote:
2003 May 13
2
RMySQL crashes R
I have justed upgraded R v1.7.0 on Windows NT 4 and have installed the
latest RMySQL (version 0.5-1)and DBI (version 0.1-5) packages.
When I issue the following commands (tactfully adjusted) R just crashes and
disappears, any ideas?
require(RMySQL)
m <- dbDriver("MySQL")
con <- dbConnect(m, dbname="xxx", user="xxx", password="xxx",
2006 Feb 21
1
color quantization / binning a variable into levels
Hi all,
I'd like to quantize a variable to map it into a limited set of integers
for use with a colormap. "image" and filled.contour" do this mapping
inside somewhere, but I'd like to choose the colors for plotting a set of
polygons. Is there a pre-existing function that does something like this
well? i.e., is capable of using 'breaks'?
2005 Nov 08
1
Output glm
Hello,
How can I obtain the likelihood ratio of a Poisson regression model?
Regards.
_____________________________________________
dr. Marziliano Ciro
Facolta' di Economia
Universita' degli Studi di L'Aquila
p.zza del Santuario, 19
67040 Roio Poggio, L'Aquila
tel.: 0862 434836
fax: 0862 434803
2003 Jun 10
2
fitting data to exponential distribution with glm
I am learning glm function, but how do you fit data using exponential
distribution with glm?
In the help file, under "Family Objects for Models", no ready made option
seems available for the distribution as well as for other distributions
satisfying GLM requirements not listed there.
2006 Feb 15
1
distribution fitting
Dear list,
Does anyone know how to fit the power law distribution?
I have the empirical distribution and would like to check whether it fits
the power law (with the power estimated from the data).
Any hints are appreciated.
Tanks a lot!
Galina
[[alternative HTML version deleted]]
2006 Feb 15
1
using kernel density estimates to infer mode of distribution
Hello...
Is it possible to use "density" or another kernel density estimator to
identify the mode of a distribution? When I use 'density', the resulting
density plot of my data is much cleaner than the original noisy histogram,
and I can clearly see the signal that I am interested in. E.g., suppose my
data is actually drawn from two or more normal (or other)
2009 Jul 06
1
transform multi skew-t to uniform distribution
Hi R-users,
I have a data from multi skew t and would like to transform each of the data to uniform data. I tried using 'pmst' but only got one output:
> rr1 <- as.vector(r1);rr1
[1] 0.7207582 5.2250906 1.7422237 0.5677233 0.7473555 -0.6020626 -2.1947872 -1.1128313 -0.6587316 -1.1409261
> pmst(rr1, xi=rep(0,10), Omega=diag(10), alpha=rep(1,10), df=5)
[1] 3.676525e-09
2006 Apr 23
3
bivariate weighted kernel density estimator
Is there code for bivariate kernel density estimation?
For bivariate kernels there is
kde2d in MASS
kde2d.g in GRASS
KernSur in GenKern
(list probably incomplete)
but none of them seems to accept a weight parameter
(like density does since R 2.2.0)
--
Erich Neuwirth, University of Vienna
Faculty of Computer Science
Computer Supported Didactics Working Group
Visit our SunSITE at
1999 Apr 23
1
[S] uniroot -- doesn't work recursively
Dear Prof Azzalini,
You have an interesting example of recursive use of uniroot().
[re-cited at the end]
However, note that R currently has the same problem as S-plus:
Uniroot() doesn't work reliably, recursively.
When you found it to be better, you were just lucky.
The relevant file in R's source, src/main/optimize.c
says
/* WARNING : As things stand, these routines should