Displaying 20 results from an estimated 30000 matches similar to: ""a"+"b""
2011 Feb 05
1
Seeking help to define method for '+'
Dear all, I am trying to define "+" method for my newly defined s4 class
which is as follows:
setClass("Me", sealed=F,representation(x1 = "numeric", x2 = "character"))
new1 <- new("Me", x1=2, x2="comment1")
new2 <- new("Me", x1=3, x2="comment1")
setMethod("+", "Me",
2011 Nov 02
1
overloading + operator for chars
Hello,
I would like to overload the "+" operator so that it can be used to concatenate two strings, e.g "John" + "Doe" = "JohnDoe".
How can I 'unseal' the "+" method?
> setMethod("+", signature(e1="character", e2="character"), function(e1, e2) paste(e1, e2, sep="") )
Error in
2005 Feb 24
3
string concatenation operator
Why doesn't R have one, like "." in Perl or juxtaposition in awk?
It does not seem impossible to introduce one, if that would be
reasonable. It would seem to involve adding a table entry to
main/names.c for the binary operator and a corresponding internal
function, say do_dot(). This cannot be simply do_paste(), since
the implied separator is "". So, do_dot() might 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
2004 Jul 06
1
questions about setMethod("Arith", ...)
Hi,
we have some questions concerning the definition of new arithmetic methods.
In our package "distr" (on CRAN) we define some new arithmetic methods
for "+", "-", "*", "/".
After loading "distr" the corresponding arithmetic methods work. Now, if
we define a new
class and also a new method for one of the arithmetic methods
2009 Mar 18
1
Why S4 methods of S3 'base' generics are not used in 'base' functions ?
Dear list,
It seems that S4 methods defined for an S3 'base' generic
are not used in 'base' functions.
This can be problematic when 'base' functions start with
something like 'as.matrix'.
### START R code
setClass("classA", contains = "matrix",
representation(realData = "numeric"))
setMethod("as.matrix",
2009 Nov 25
1
group generics
I have classes A and B, where B contains A. In the implementation of
the group generic for B I would like to use the corresponding group
generic for A. Is there a way to do that?
I would also appreciate any comments if what I'm trying to do seems like
the wrong approach.
Here's a stripped down example:
setClass("A",
2007 Apr 26
1
Problem with R-2.5.0 patched and Matrix package
Hi,
Using latest R 2.5.0 Patched, I'm unable to install the Matrix package
from cran.fhcrc.org.
I get:
Creating a new generic function for "isSymmetric" in "Matrix"
Creating a new generic function for "unname" in "Matrix"
Error in conformMethod(signature, mnames, fnames, f) :
In method for function "!": formal arguments omitted in
2006 Apr 07
4
setIs and method dispatch in S4 classes
Dear all,
I have a question regarding setIs and method dispatch in S4 classes:
Consider the following example:
#####################################################
## A02 "contains" A01 by setIs:
setClass("A01", representation(a="numeric",b="numeric"))
setClass("A02", representation(a="numeric",d="numeric"))
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
2014 Mar 26
5
Conflicting definitions for function redefined as S4 generics
That might be worth thinking about generally, but it would still be nice to
have the base generics pre-defined, so that people are not copy and pasting
the definitions everywhere, hoping that they stay consistent.
On Wed, Mar 26, 2014 at 6:13 AM, Gabriel Becker <gmbecker@ucdavis.edu>wrote:
> Perhaps a patch to R such that generics don't clobber each-other's method
> tables
2007 Mar 23
1
substitute and S4 objects
Hi all,
I don't understand why this does not what I expect :
## code start here ##############
setClass("num",representation(x="numeric"))
num<-function(x) new("num",x=x)
add<-function(e1,e2) {
cat("Computing
",deparse(substitute(e1)),"+",deparse(substitute(e2)),"\n")
e1@x+e2@x
}
2006 Apr 12
1
yet another problem with S4 dispatch (with setClassUnion)
Dear John and Seth, dear R-devels,
once again the question of method dispatch in S4 -- this time with
setClassUnion(); taking up your advice in
https://stat.ethz.ch/pipermail/r-devel/2006-April/037200.html
https://stat.ethz.ch/pipermail/r-devel/2006-April/037201.html
I have been too quick in stating that
>setClassUnion()---at least in my case---solves the problem;
>
The problem arises
2003 Jun 10
1
c(...) and methods
I have been writing some S4 classes and have a problem about how I might
pass a signature to "c()".
Take the following example:
setClass("collection", representation("list", date="POSIXt"))
x <- new("collection", list(1,2,3), date=Sys.time())
y <- new("collection", list(4,5,6), date=Sys.time())
obviously, I can do c(x,y), but
2009 Dec 18
1
How to define new operators
Dear R community
I try to create a new operator to build a special sum of two CashFlows. (my
S4 Class)
I tried the following but this is actually not what I want.
setGeneric("++",function(e1,e2)standardGeneric("++"))
setMethod("+",signature=list("CashFlow","CashFlow"),function(e1,e2){
print("+")
})
2010 Jul 07
2
how to define method for "+" function in a new class
Dear R developers,
I have a new class, which I called "Molecule", and have tried to define =
a "+" operation for 2 objects of this class.
This is what I have written so far, although the method is not complete =
(I'm trying to look at it at intermediate stages):
setMethod(
f=3D"+",
signature(x=3D"Molecule",y=3D"Molecule"),
2008 Aug 07
1
'"ts" treated as a registered S3 class, but keep its "structure" behaviour' ?
Dear all,
In R-devel I have noticed the new approach for the "ts" class in the
package "methods".
the "structure" behaviour of "ts" is not always kept when one uses
"ts" objects and objects of classes which extend the virtual class
"structure".
As a short example:
## this works fine
setClass("foo", representation(header =
2010 Oct 28
1
overloading the generic primitive functions "+" and "["
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2013 Apr 24
1
multiple issues with is.unsorted()
Hi,
In the man page for is.unsorted():
Value:
A length-one logical value. All objects of length 0 or 1 are
sorted: the result will be ?NA? for objects of length 2 or more
except for atomic vectors and objects with a class (where the ?>=?
or ?>? method is used to compare ?x[i]? with ?x[i-1]? for ?i? in
?2:length(x)?).
This contains many incorrect
2013 Jul 09
1
Is difftime a "class"
I am trying to write S4 methods with "difftime" in the signature but
am being "informed" (? not a warning or error) that "difftime" is not
a class. Nevertheless, dispatch takes place. Should I simply ignore
that "information"? Here is a toy example:
> setClass("foo", contains = "Date")
> setMethod("+", c("foo",