Displaying 20 results from an estimated 6000 matches similar to: "qbinom when probability is 1 (PR#5900)"
2005 Nov 23
1
qbinom returns NaN
Hi, All:
For most but not all cases, qbinom is the inverse of pbinom.
Consider the following example, which generates an exception:
> (pb01 <- pbinom(0:1, 1, .5, log=T, lower.tail=FALSE))
[1] -0.6931472 -Inf
Since "lower.tail=FALSE", Pr{X>1} = 0 in this context, and log(0) =
-Inf, consistent with the documentation.
However, the inverse of this does NOT
2007 Jun 28
2
inaccuracy in qbinom with partial argument matching
Hi,
I found the following strange effect with
qbinom & partial argument matching
p0 <- pbinom(0, size = 3, prob = 0.25)
qbinom(p0, size = 3, prob = 0.25) ## 0 o.k.
qbinom(p0-0.05, size = 3, prob = 0.25) ## 0 o.k.
## positional matching:
qbinom(p0, 3, 0.25) ## 0 o.k.
## partial argument matching:
qbinom(p0 , s = 3, p = 0.25) ## 1 ???
qbinom(p0-0.05,
2009 May 20
3
qbinom (PR#13711)
Full_Name: Wolfgang Resch
Version: R 2.8.1 GUI 1.27
OS: OS X 10.4.11
Submission from: (NULL) (137.187.89.14)
Strange behavior of qbinom:
> qbinom(0.01, 5016279, 1e-07)
[1] 0
> qbinom(0.01, 5016279, 2e-07)
[1] 16
> qbinom(0.01, 5016279, 3e-07)
[1] 16
> qbinom(0.01, 5016279, 4e-07)
[1] 16
> qbinom(0.01, 5016279, 5e-07)
[1] 0
2004 Jun 11
1
qbinom(p, size, prob = 0, lower.tail = FALSE) hangs (PR#6972)
Full_Name: Jon McAuliffe
Version: 1.9.0
OS: Mac OS X 10.3.4
Submission from: (NULL) (64.166.16.252)
a call like qbinom(0.3, 10, prob = 0, lower.tail = FALSE) hangs R. prob = 0 does
not
look interesting, but it can be useful for completeness when qbinom is part of
other general routines.
please see PR#5900 (Accuracy-fixed).
jon.
--please do not edit the information below--
Version:
2012 Nov 30
4
qbinom
a=c(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9)
b=c(0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1)
cor(a,b)= -1
a'=qbinom(a, 1, 0.5)
b'=qbinom(b, 1, 0.5)
why cor(a',b') becomes -0.5 ?
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2000 Apr 07
4
Bug in qbinom? (PR#511)
n_10;p_0.5;jjx_0:n;qbinom(pbinom(jjx,n,p),n,p) # This one works as
expected
n_100;p_0.5;jjx_0:n;qbinom(pbinom(jjx,n,p),n,p) # This one causes
severe problems
I cannot interrupt using ESC and I finally have to resort to the Windows
Task manager to kill the R session.
A friend of mine told me that he faced similar problems under Unix.
--please do not edit the information below--
Version:
2003 Dec 19
1
Missing arguments to new
Is this the expected and/or correct behaviour? And if
so, how do I persuade new to interpret a named but
missing argument as missing?
-------------
setClass("testMissing",representation(a="numeric"),prototype=list(a=0));
showMissing <- function(real.arg,missing.arg) {
really.missing <- new("testMissing");
show(really.missing);
really.there <-
2004 Jan 21
1
[g]sub behaviour with NA (PR#6451)
Full_Name: Jonathan Swinton
Version: 1.9.0
OS: Windows 2000
Submission from: (NULL) (193.132.159.34)
Attempting to substitute a NA causes an error in sub.
> sub(x=NA,pattern="x",replacement="y")
Error in sub(pattern, replacement, x, ignore.case, extended) :
invalid argument
> sub(x=NA,pattern=NA,replacement="y")
[1] NA
The help page for sub says only
2004 Apr 20
2
Re: [R] Unexpected behaviour of identical (PR#6799)
"Swinton, Jonathan" <Jonathan.Swinton@astrazeneca.com> writes:
> # works as expected
> > ac <- c('A','B');
> > identical(ac,ac[1:2])
> [1] TRUE
>
> #but
> > af <- factor(ac)
> > identical(af,af[1:2])
> [1] FALSE
>
> Any opinions?
Did a cross-check with Splus and it doesn't do that , so I think it
2004 Apr 19
3
How to write an S4 method for sum or a Summary generic
If I have a class Foo, then i can write an S3 method for sum for it:
>setClass("Foo",representation(a="integer"));aFoo=new("Foo",a=c(1:3,NA))
>sum.Foo <- function(x,na.rm){print(x);print(na.rm);sum(x at a,na.rm=na.rm)}
>sum(aFoo)
But how do I write an S4 method for this? All my attempts to do so have
foundered. For example
2006 Jan 17
1
data.matrix returns mode logical for zero rows (PR#8496)
Full_Name: Jonathan Swinton
Version: 2.2.1
OS: Windows
Submission from: (NULL) (193.132.159.169)
#The first line of description for data.matrix says that it will
# 'Return the matrix obtained by converting all the variables in a
# data frame to numeric mode and then binding them together as the
# columns of a matrix.'
#However when called with a data.frame with zero rows,
2003 Oct 31
1
solve.Matrix() not found (PR#4887)
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Dear R developers,
this morning I started experiencing a bizarre problem with the
2003 Jan 22
2
small bug in binom.test?
Hi all,
I am wondering whether there is a small bug in the binom.test function of
the ctest library (I'm using R 1.6.0 on windows 2000, but Splus 2000 seems
to have the same behaviour). Or perhaps I've misunderstood something.
the command binom.test(11,100,p=0.1) and binom.test(9,100,p=0.1) give
different p-values (see below). As 9 and 11 are equidistant from 10, the
mean of the
2023 Apr 08
1
Error message for infinite probability parameters in rbinom() and rmultinom()
On 08/04/2023 5:53 p.m., Martin Maechler wrote:
>>>>>> Christophe Dutang
>>>>>> on Sat, 8 Apr 2023 14:21:53 +0200 writes:
>
> > Dear all,
>
> > Using rmultinom() in a stochastic model, I found this function returns an error message 'NA in probability' for an infinite probability.
>
> > Maybe, a more
2003 Oct 27
3
(PR#4806)
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2003 Apr 01
2
Old style and new style classes
I have been writing quick and dirty S-plus code for years, but for a recent project I took the plunge, bought Venables and Ripley's S Programming, and implemented a class library using new style classes (in S-Plus 6.0). It worked quite nicely and I am wondering about making more routine use of them. Before I make much more of an investment, I have a few questions, both factual and subjective,
2003 Apr 01
2
Old style and new style classes
I have been writing quick and dirty S-plus code for years, but for a recent project I took the plunge, bought Venables and Ripley's S Programming, and implemented a class library using new style classes (in S-Plus 6.0). It worked quite nicely and I am wondering about making more routine use of them. Before I make much more of an investment, I have a few questions, both factual and subjective,
2003 Apr 22
2
Handling of upper/lowercase in package names (PR#2816)
Hi,
This is (presumably?) a bug in R 1.7.0 under Windows. I have not tested it
on other systems. Attachment of packages is case sensitive but not
library(), resulting in multiple loadings of the same package if the library
name is spelled differently. The following example loads the `tools'
package, once as `tools' and once as `Tools'. This behavior is the same with
all packages and
2008 Aug 21
1
pnmath compilation failure; dylib issue?
(1) ...need to speed up a monte-carlo sampling...any suggestions about
how I can get R to use all 8 cores of a mac pro would be most useful
and very appreciated...
(2) spent the last few hours trying to get pnmath to compile under os-
x 10.5.4...
using gcc version 4.2.1 (Apple Inc. build 5553) as downloaded from
CRAN, xcode 3.0...
...xcode 3.1 installed over top of above after
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