Displaying 20 results from an estimated 900 matches similar to: "simulation with "rpois""
1997 Jul 09
1
R-beta: Problem with `rpois'
There is a problem with `rpois'. It does seem to take care about the
order of the arguments. This is an example:
> rpois(n=1,lambda=2)
[1] 3
> rpois(lambda=2,n=1)
[1] 2 0
It obviously uses the first argument as the number of samples to be
drawn, which is wrong.
I used Version 0.49 Beta (April 23, 1997).
Fredrik
1997 Jul 09
1
R-beta: Problem with `rpois'
There is a problem with `rpois'. It does seem to take care about the
order of the arguments. This is an example:
> rpois(n=1,lambda=2)
[1] 3
> rpois(lambda=2,n=1)
[1] 2 0
It obviously uses the first argument as the number of samples to be
drawn, which is wrong.
I used Version 0.49 Beta (April 23, 1997).
Fredrik
2007 Oct 10
5
chi2
Hello,
I want to use the quantile function so I read the doc but I don't understand with this
> qchisq(seq(0.05,0.95,by=0.05),df=(length(don)-1))
[1] 62667.11 62795.62 62882.42 62951.47 63010.74 63064.00 63113.39 63160.27 63205.65 63250.33 63295.04 63340.48 63387.48 63437.03 63490.53 63550.14 63619.68
[18] 63707.24 63837.16
Can you help me please?
2012 Nov 13
1
Simulation with cpm package
Hi,
I am running the following code based on the cpm vignette's code. I believe
the code is syntactically correct but it just seems to hang R. I can get
this to run if I set the sims to 100 but with 2000 it just hangs. Any ideas
why?
Thanks,
Chris
library(cpm)
cpmTypes <- c("Kolmogorov-Smirnov","Mann-Whitney","Cramer-von-Mises")
changeMagnitudes <- c(1, 2,
2005 Dec 13
8
superimpose density line over hist
Hi all,
I'm trying to superimpose a rchisq density line over a histogram with
something like:
hist(alnlength)
lines(density(rchisq(length(alnlength), 4)),col="red")
But the rchisq line won't appear anywhere,
Anyone knows what I am missing here?
Thanks in advance,
Albert.
2012 Dec 04
3
monte carlo simulation on R
Hello,
How can I make a monte carlo simulation on R?
Regards
Adel
--
PhD candidate in Computer Science
Address
3 avenue lamine, cité ezzahra, Sousse 4000
Tunisia
tel: +216 97 246 706 (+33640302046 jusqu'au 15/6)
fax: +216 71 391 166
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2015 Oct 23
3
resolución de ecuación
Se ha borrado un adjunto en formato HTML...
URL: <https://stat.ethz.ch/pipermail/r-help-es/attachments/20151023/300f7387/attachment.html>
2010 Aug 17
2
plotting functions of chi square
Hi! This is going to be a real newbie question, but I can't figure it out.
I'm trying to plot densities of various functions of chi-square. A simple
chi-square plot I can do with dchisq(). But e.g. chi.sq/degrees of freedom I
only know how to do using density(rchisq()/df). For example:
plot(1, type="n", xlab="", ylab="", xlim=c(0,2), ylim=c(0,7))
for (i
2012 Aug 22
2
Samba4 successful deployment
I've just installed samba4 beta 7 with defaults and everything went OK.
As I download bind9.9.1 tarball and compiled it I had to follow steve's
advice:
to declare we'll be using DLZ_DLOPEN_VERSION 2 in
/samba-master/source4/dns_server/dlz_minimal.h
/*#ifdef BIND_VERSION_9_8
#define DLZ_DLOPEN_VERSION 1
#else
#define DLZ_DLOPEN_VERSION 2
#endif
*/
#define DLZ_DLOPEN_VERSION 2
I
2006 Jul 01
1
noncentral F-distributed random numbers (PR#9055)
Full_Name: Long Qu
Version: 2.3.1
OS: Windows XP
Submission from: (NULL) (64.113.93.235)
The QQ-plot of two versions of simulating noncentral F-distributed random
numbers has quite different scales:
> qqplot(rf(1000,2,15,3),qf(runif(1000),2,15,3))
The rf() function reads:
> rf
function (n, df1, df2, ncp = 0)
{
if (ncp == 0)
.Internal(rf(n, df1, df2))
else rchisq(n, df1,
2010 Nov 07
3
Integrate and mapply
Hi,
I need some help on integrating a function that is a vector.
I have a function - vector which each element is different. And,
naturally, function integrate() does not work
I checked the article of U. Ligges and J. Fox (2008) about code
optimization "How Can I Avoid This Loop or Make It Faster?" on
http://promberger.info/files/rnews-vectorvsloops2008.pdf.
Their advice did not help
2012 Sep 03
3
Windows boxes cannot find the file server
Hi
I have a Samba4 AD running samba and a Samba3 machine joined to the
domain as a file server. I have smbd and winbind running on the samba3 box.
Samba4: hh30.hh3.site
Samba3: hh32.hh3.site
I can browse the shares (netlogon and sysvol) on the S4 machine by
typing \\hh30 into explorer but if I type \\hh32 I get:
Windows cannot find '\\hh32'. Check the spelling. . .etc.
When I start
2006 Dec 19
3
Bug in rt() ? (PR#9422)
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
<<insert bug report here>>
Reproduced on Debian and Windows ...
On 2.4.x if you execute
set.seed(12345)
t.1 <- rt(n = 1000, df = 20)
set.seed(12345)
t.2 <- rt(n = 1000, df = 20, ncp = 0)
all.equal(t.1, t.2) ## Not close to true
This appears to be due to the fact that in 2.4.x rt is now
rt
function (n, df, ncp = 0)
{
if
2002 Jun 13
3
Bug in rnorm. (PR#1664)
There appears to be a mild bug, or at least a deficiency, in
rnorm. The bug becomes apparent when one looks at extremes
of the squares of the values generated by rnorm; rnorm is not
generating quite enough extreme values.
The R version that I am using is 1.4.1; I never got around to installing
1.5.0, and now since 1.5.1 is about to come out .... However, checking
the 1.5.0 release notes
2008 Jul 08
4
Histogram with colors according to factor
Given a data frame with a continuous variable and a factor. I would like to
generate a histogram of the continuous variable, where each bar is filled
with different colors according to the percentage of factor values falling
into this region of the continuous variable.
I looked into packages like 'lattice' and 'ggplot2'. Searching R-help
revealed that 'histogram' is
2008 Oct 20
2
folded normal distribution in R
Dear R useRs,
i wanted to ask if the folded normal destribution (Y = abs(X) with X
normal distributed)
with density and random number generator is implemented in R or in any
R-related package
so far? Maybe i can use the non-central chi-square distribution and
rchisq(n, df=1, ncp>0) here?
Thanks and best regards
Andreas
2010 Aug 16
1
lm prediction strange error
Dear all,
I have an error in the simple prediction function for lm().
Maybe someone experienced the same?
xma <- matrix(data = 0, nrow = 100, ncol = 2)
xma[, 1] <- rnorm(100)
xma[, 2] <- rchisq(100, df = 3)
m1 <- lm(xma[, 1] ~ xma[, 2])
predict(m1, as.data.frame(seq(-13, 13, 0.5)))
Thanks a lot,
Trafim
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2012 Nov 30
3
protentially serious R error
Hi guy,
I have recently encountered a problem while I was just trying to generate
some random numbers with the function "rnorm", the problem is shown below:
########case 1############
> rnorm(20*0.2)
[1] -1.2765922 -0.5732654 -1.2246126 -0.4734006
########case 2###########
*> rnorm(20*(1-0.8))
[1] -0.62036668 0.04211587 -0.91092165*
#########case 3############
> a<-0.2
>
2006 Jun 30
1
Random numbers from noncentral t-distribution
Hi there:
I'd thought these two versions of noncentral t-distribution are essentially the same:
> qqplot(rt(1000,df=20,ncp=3),qt(runif(1000),df=20,ncp=3))
But, the scales of the x-axis and the y-axis are quite different according to the QQ-plot.
Did I make any mistakes somewhere?
Thanks,
Long
---------------------------------
2003 Dec 07
5
A hint to start ESS-xemacs
I'm trying to use ESS & xemacs under debian linux testing and KDE.
My problem is that I didn't find any document in the internet explaining a
**step by step** session with R and xemacs.
The (wrong) procedure I follow (to no avail!) is:
1) I start R in a terminal window;
2) I start xemacs and open a file with the extension .R (test.R);
3) I issue M-x R RET and I can see an Rd new