Displaying 20 results from an estimated 1200 matches similar to: "unif_rand() and exp_rand()"
2002 Aug 27
2
Peter Dalgaard's book availability....
Dear List,
Does anyone know when will be available Peter
Dalgaard's book: "Introductory Statistics with R" ?.
According to Amazon: "This item will be published on
August 15, 2002", but it continues unpublised.
Thanks,
Carlos Ortega.
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Nueva versi?n: Webcam, voz, y mucho m?s ?Gratis!
2002 Aug 21
0
Tenure track positions in Statistics
This email is forwarded on behalf of Dr. Herbert Gaskill.
Please do not reply to me but direct enquiries to
Ms Wanda Heath <wanda at math.mun.ca> or Dr. Herbert Gaskill
<head at math.mun.ca>. Apologies for cross-posting.
MEMORIAL UNIVERSITY OF NEWFOUNDLAND
St. John's, Newfoundland, Canada A1C 5S7
www.math.mun.ca
DEPARTMENT OF MATHEMATICS AND STATISTICS
The Department of
2003 Oct 31
2
Summing elements in a list
Hi,
Suppose that I have a list where each component is a list of two
matrices. I also have a vector of weights. How can I collapse my
list of lists into a single list of two matrices where each matrix
in the result is the weighted sum of the corresponding matrices.
I could use a loop but this is a nested calculation so I was hoping
there is a more efficient way to do this. To help clarify,
2019 Mar 22
1
Status of R_unif_index
Dear List,
section "6.3 Random number generation" of WRE [1] lists unif_rand(),
norm_rand() and exp_rand() as the interface to R's RNG. Now
R_ext/Random.h also has
double R_unif_index(double);
Can this be also treated as an official API function that may be called
from a package?
Thanks
Ralf
[1]
https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Random-numbers
--
2004 Jun 15
2
About function "unif_rand()"
hello, everybody,
I met a problem that I want to generate a random uniform number by using
function with c interface.
What I found is only "unif_rand()", but its range is [0,1]. How can I create a
uniform random variable by using a function with c interface.
Who can tell me what function it is and how to use?
I will appreciate for it very much.
Thanks in advance!
xiaotong wang
1999 Jul 23
1
lapply( *, names) -- bug ?!
This came on S-news
The more direct test being
sapply(c(a=1,b=2), names)
Problem:
R ("all" versions)
behaves the same as S+5.1, which is wrong IMO.
{since some might disagree, I didn't yet post to R-bugs ..}
------- Start of forwarded message -------
Date: Thu, 22 Jul 1999 23:14:57 -0230
From: "Paul Y. Peng" <ypeng@math.mun.ca>
To: s-news
2003 Jan 10
6
R-1.6.2 is released
I've rolled up R-1.6.2.tgz a short while ago. This is a minor upgrade,
fixing an assortment of bugs.
You can get it from the developer site at
http://cvs.r-project.org/pub/CRAN/src/base/R-1.6.2.tgz
or wait for it to be mirrored at a CRAN site near you. Binaries for
various platforms will appear in due course.
There is also a version split for floppies, but due to the inclusion
of
2003 Jan 10
6
R-1.6.2 is released
I've rolled up R-1.6.2.tgz a short while ago. This is a minor upgrade,
fixing an assortment of bugs.
You can get it from the developer site at
http://cvs.r-project.org/pub/CRAN/src/base/R-1.6.2.tgz
or wait for it to be mirrored at a CRAN site near you. Binaries for
various platforms will appear in due course.
There is also a version split for floppies, but due to the inclusion
of
2004 Mar 23
1
R equivilant to RAND_MAX in C
Hello,
I have some C code that I'm interfacing to R using the .C calling
interface. Currently the C code uses the rand() function from the GNU C
library to generate random numbers. Since I need the random numbers in a
range from 0 to a (where a is an integer) I use the RAND_MAX macro as
(int)(rand() * (float)(*nobs-1) / (RAND_MAX+1.0))
(taken from the rand() manpage)
However, since I have
2010 Jan 28
1
Problem with R math library.
Hello.
I've been working on my OCaml-R binding, and I quite pleased to see that
it is functional, though far from being perfect or polished. You can
find the gitweb webpage and the interface documentation at
http://yziquel.homelinux.org/gitweb/?p=ocaml-r.git;a=tree
http://yziquel.homelinux.org/topos/api/ocaml-r/index.html
I'm having unexpected trouble with the math library, though.
2002 Oct 22
1
Re: [S] Draw ellipses in S-PLUS or R?
Many thanks to Andy Liaw for quickly reminding me of "ellipse"
package in CRAN. It is apparently what I wanted. Not sure whether
it will work in S-PLUS or not. But I will give it a try.
Thank you.
Paul.
>
> Have you checked CRAN? There's an "ellipse" package on CRAN for quite a
> while.
>
> Andy
>
> > -----Original Message-----
> > From:
2002 Jan 24
2
random number generation issues with r and compiled C code
Dear People,
I have been writing a simulation routine that is currently entirely
written in c++. I've been using the R standalone math library to give me
random number generation for this. However, I have had to set the seed
myself, and I am using
set_seed(time(NULL), clock)
for every call to unif_rand().
However, this works really badly. The random numbers aren't uniform at
all. Does
2008 Jul 03
1
GetRNGstate and PutRNGstate
Hi,
I've got a simulation function, written in C and called from R, that
uses the R random number functions. It's not a very complicated
simulation - 280 lines total, with the main function (the one called
with .C) repeatedly calling another function, with multiple calls to
unif_rand() in both functions. At the beginning of the main function I
call GetRNGstate(), and the last thing I do
2018 Sep 19
4
Bias in R's random integers?
Hi Duncan--
Nice simulation!
The absolute difference in probabilities is small, but the maximum relative
difference grows from something negligible to almost 2 as m approaches
2**31.
Because the L_1 distance between the uniform distribution on {1, ..., m}
and what you actually get is large, there have to be test functions whose
expectations are quite different under the two distributions.
2018 Sep 19
2
Bias in R's random integers?
It doesn't seem too hard to come up with plausible ways in which this could
give bad results. Suppose I sample rows from a large dataset, maybe for
bootstrapping. Suppose the rows are non-randomly ordered, e.g. odd rows are
males, even rows are females. Oops! Very non-representative sample,
bootstrap p values are garbage.
David
On Wed, 19 Sep 2018 at 21:20, Duncan Murdoch <murdoch.duncan
2019 Mar 01
1
issue with sample in R 3.6.0.
Hello,
I think there is an issue in the sampling rejection algorithm in R 3.6.0.
The do_sample2 function in src/main/unique.c still has 4.5e15 as an
upper limit, implying that numbers greater than INT_MAX are still to
be supported by sample in base R.
Please review the examples below:
set.seed(123)
max(sample(2^31, 1e5))
[1] 2147430096
set.seed(123)
max(sample(2^31 + 1, 1e5))
[1] 1
2018 Sep 19
2
Bias in R's random integers?
A quick point of order here: arguing with Duncan in this forum is
helpful to expose ideas, but probably neither side will convince the
other; eventually, if you want this adopted in core R, you'll need to
convince an R-core member to pursue this fix.
In the meantime, a good, well-tested implementation in a
user-contributed package (presumably written in C for speed) would be
enormously
2018 Sep 19
2
Bias in R's random integers?
No, the 2nd call only happens when m > 2**31. Here's the code:
(RNG.c, lines 793ff)
double R_unif_index(double dn)
{
double cut = INT_MAX;
switch(RNG_kind) {
case KNUTH_TAOCP:
case USER_UNIF:
case KNUTH_TAOCP2:
cut = 33554431.0; /* 2^25 - 1 */
break;
default:
break;
}
double u = dn > cut ? ru() : unif_rand();
return floor(dn * u);
}
On Wed, Sep
2003 Apr 01
2
predict in Pspline package (PR#2714)
To whom it may concern,
I don't know whether this is really a bug with the Pspline package or
only a problem with my installation. Things work fine in Linux but
not in Mac OS X (Darwin). Both system run the latest public versions
of R and Pspline.
predict.smooth.Pspline produces only NaN instead of predicted values
when norder>2:
> library (Pspline)
> tt <- seq
2009 Nov 13
2
random numbers in C
I need some random numbers in my C program. Here a small example:
////////////////////////////////////////////////////////////////////////////////
#include <R.h>
void rand (int* n)
{
int len = *n;
for (int i = 0; i < len; i++)
Rprintf("%1.5f ", unif_rand());
}
dyn.load("rand.dll")
.C("rand", as.integer(10))
dyn.unload("rand.dll")