Displaying 20 results from an estimated 200 matches similar to: "setMethod() and log()"
2006 Sep 15
1
setMethod() woes
Hello everybody
R version 2.4.0 alpha (2006-09-15 r39323), MacOSX 10.4.7
Next S4 problem.
I have "brob" objects that are large real numbers, and now I want "glub"
numbers that are to be a pair of glubs that represent complex numbers.
I want to define binary operator "+" so that if either the left or right
argument are glubs, it uses .ArithGlub.
If either
2008 May 28
1
indexing lists, using brobdingnagian
Dear R-Gurus,
I have ended up with a calculation problem where I need to use brobs.
I have to work my way through a vector with a for loop to act on each
element in a calculation (refering to the previous
value in the new vector of results -- so as far as I know I can't use
"apply") -- this produces a list of brobs.
My problem is, how do I act on, plot this list, or do vector
2006 Sep 04
1
setMethod("Summary")
Hi everyone and thanks for being patient. I've used "!.foo"() et
seq pro tem.
Next problem: how to define "Summary" methods for brobs.
?max says
'max' and 'min' are generic functions: methods can be defined for
them individually or via the 'Summary' group generic. For this to
work properly, the arguments '...' should be
2006 Sep 01
1
setMethod("Logic", ...)
Hi
In V&R the "polynomial" class is explicitly specified to have no
logical operators:
setMethod("Logic", signature(e1="polynomial"), function(e1,e2){stop
("...")})
I too have a class of objects for which I want to
specify that Logic operators do not work, but executing
setClass("brob",
representation = representation
2006 Oct 31
1
setReplaceMethod
Hi
If x <- 1:10 then x[5] <- 1i will promote
x to be a complex vector.
Suppose I have an S4 class "brob", and have functions
is.brob(), as.brob(), as.numeric() and so forth (minimal self-contained
code below).
If x is numeric (1:10, say) and y is a brob, what
is the best way to make
x[5] <- y
promote x to a brob in the same way as the complex example?
Or is
2007 Aug 30
7
Behaviour of very large numbers
Dear all,
I am struggling to understand this.
What happens when you raise a negative value to a power and the result
is a very large number?
B
[1] 47.73092
> -51^B
[1] -3.190824e+81
# seems fine
# now this:
> x <- seq(-51,-49,length=100)
> x^B
[1] NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN <snip>
> is.numeric(x^B)
[1] TRUE
> is.real(x^B)
[1]
2010 Oct 08
2
Error message in as.brob Usage
I am getting the following error message while using the as.brob function in
some computations:
Error in out.x[ss] <- pmax(x1[ss], x2[ss]) + log1p(+exp(-abs(x1[ss] - :
NAs are not allowed in subscripted assignments
Is there any obvious mistake I am making here that can resolve the above
error message?
Thanks for your help.
Chow
--
View this message in context:
2007 Nov 21
1
equivalent of Matlab robustfit?
Hi,
I've been using the Matlab robustfit function for linear regressions
where I suspect some data points are outliers. Is there an equivalent
function in R?
Take care, Darren
PS, This is the Matlab help on robustfit:
>> help robustfit
ROBUSTFIT Robust linear regression
B = ROBUSTFIT(X,Y) returns the vector B of regression coefficients,
obtained by performing robust
2006 Sep 12
1
package.skeleton() in R-2.4.1
Hi
R version 2.4.0 alpha (2006-09-06 r39158)
MacOSX 10.4.7
There was a thread some time ago as to whether the structure created by
package.skeleton() would pass R CMD check.
I have an example where package.skeleton() gives an R file that gives an
error when sourced.
If I type
setClass("brob",
representation = representation
2010 Sep 19
1
odds ratios for n-way tables: seeking an *apply-able method
I'm looking for a way to generalize the calculation of (log) odds
ratios for 2 x 2 x {strata} frequency
tables in vcd::oddsratio() to R x C x {strata} tables.
For an R x C table, F, odds ratios can be defined
in several ways; one simple way, particularly for tables with ordered
factors, is to calculate the
set of continuation odds ratios, based on the (R-1)x(C-1) set of 2x2
tables with
2009 Feb 11
5
How to handle large numbers?
Dear R,
I have two questions:
1, Why both R and Matlab give 0*Inf==NaN? To my knowledge, it should be zero
mathematically. Am I right?
2, I need to calculate e.g. exp(a)/(exp(b)+c), where both a and b are very
large numbers (>>1000, e.g a=1000, b=1007, and c=5). R gives me NaN when I
use the following command:
> exp(1000)/(exp(1007)+5)
[1] NaN
I am pretty sure this should be close to
2008 Sep 16
0
FW: odesolve dynload example
HI R Gurus,
> This is my first foray into using c-code with R, so ...
> I had a look at the archives and did not find anything on this, so
> hopefully I am not doubling up.
>
I have previously used the following approach where I needed some very
small numbers/large (using Brobdingnag):
surfacewithdiff <- function(t, y, p)
{
const=p["const"]
kay
2007 Jan 12
0
Dummy's guide to S4 methods: package Brobdingnag
Hello List.
please find uploaded to CRAN a new package, Brobdingnag.
This package does two things:
(1) allows computation of very large numbers using a logarithmic
representation.
(2) provides a "Hello, World" example of S4 methods in use: there are
two classes of object
(brob and glub) and one virtual class (swift). The package
includes a vignette that is a
2008 Sep 16
0
lsoda( linking to GMP for big numbers from C code)
Hi R used with C-code experts,
I had a look at the archives and did not find anything on this, so
hopefully I am not doubling up.
I have previously used the following approach where I needed some very
small/large numbers (using Brobdingnag):
surfacewithdiff <- function(t, y, p)
{
const=p["const"]
kay =p["kay"]
psii=p["psii"]
2008 May 21
2
\S4method in combination with "[" and "[<-"
Dear developers,
We want to use "\S4method" to document new S4-methods for "[" and "[<-".
We use this for other functions/methods and it works without any
problem, but in case of "[" and "[<-" we didn't manage to bring this to
work.
The problem occurs in the development version of our package "distrSim"
which can be found
2011 Oct 22
1
setMethod "[" - extract by names within Slot
Hi R-helper!
I have problem with setMethods for "[". Here is example :
setClass("myClass", representation(ID.r = "numeric", ID.c = "character", DAT = "matrix"))
to.myClass <- function(ID.r, ID.c, DAT) {
out <- new("myClass", ID.r = ID.r, ID.c = ID.c, DAT = DAT)
return(out)
}
setMethod("[",
2002 Feb 19
1
library(methods): setMethod with "ANY" fails. (PR#1317)
Full_Name: Henrik Bengtsson
Version: R v1.4.1
OS: WinMe
Submission from: (NULL) (217.208.14.137)
Doing the following
library(methods)
setGeneric("foo", function(x) standardGeneric("foo"))
setMethod("foo", "ANY", function(x) cat(x))
fails with
Error in while (value[n] == "ANY") n <- n - 1 :
missing value where logical needed
It
2002 Aug 26
1
Rprof and setMethod conflict (PR#1949)
Full_Name: Kevin C. Bartz
Version: 1.5.1
OS: Solaris 2.6
Submission from: (NULL) (192.223.226.5)
A while ago, I noticed this oddity about R profiling and setMethod.
First, I "test out" Rprof.
> require(methods)
Loading required package: methods
[1] TRUE
>
> Rprof("test.out")
> data.frame("a")
X.a.
1 a
> Rprof(NULL)
So far, so good. Next, I
2009 Jul 07
0
Protection stack overflow when calling setGeneric()/setMethod() from within .onLoad()
Hi list,
Calling setGeneric()/setMethod() from within the .onLoad() hook
of MyPkg package produces the following error:
> gctorture(TRUE)
> library(MyPkg)
.onLoad(): ok1
.onLoad(): ok2
Error : protect(): protection stack overflow
Error : .onLoad failed in 'loadNamespace' for 'MyPkg'
Error: package/namespace load failed for 'MyPkg'
This is with
2006 Mar 14
1
setMethod confusion
Hello I've checked through previous postings but don't see a fully
equivalent problem-just a few hints.
I have been trying to set a new method for the existing function "table"
or "as.data.frame.table" for my class "tfSites".
Taking out all the useful code and just returning the input class I get
the error
setMethod("table",