> This is a bug in the mingw runtime, and not in R. So the difference is
> between OSes, not between R versions. Note that
>
> > acosh(2)
> [1] 1.316958
> > acosh(2+0i)
> [1] 0+NaNi
> > acosh(2+1e-10i)
> [1] 1.316958+0i
>
> so it seems to be happening only for exactly real complex numbers.
>
Thank you, Dirk. I'll keep this in mind.
-Christos
-Original Message-
From: Dirk Eddelbuettel [mailto:[EMAIL PROTECTED]
Sent: Sunday, December 03, 2006 12:47 PM
To: [EMAIL PROTECTED]
Cc: 'Prof Brian Ripley'; r-devel@r-project.org
Subject: Re: [Rd] passing matrix as argument to a C func
Hi!
If I am not wrong issue described at
http://thread.gmane.org/gmane.comp.lang.r.devel/9667/focus=9667
did not get any attention. Thought it is true that using names() instead of
colnames() does not change mode of data.frame rownames.
This issues are also "alive":
http://thread.gmane.org/gm
On 3 December 2006 at 11:47, Christos Hatzis wrote:
| Thank you. The code in kmeans.c is indeed informative. One needs to
| remember that an R matrix is a vector with attributes.
In case there is any chance that you could turn your part of the source from
C into C++, try RcppTemplate from CRAN
Thank you. The code in kmeans.c is indeed informative. One needs to
remember that an R matrix is a vector with attributes.
-Christos
-Original Message-
From: Prof Brian Ripley [mailto:[EMAIL PROTECTED]
Sent: Sunday, December 03, 2006 3:25 AM
To: Christos Hatzis
Cc: r-devel@r-project.o
This is a bug in the mingw runtime, and not in R. So the difference is
between OSes, not between R versions. Note that
> acosh(2)
[1] 1.316958
> acosh(2+0i)
[1] 0+NaNi
> acosh(2+1e-10i)
[1] 1.316958+0i
so it seems to be happening only for exactly real complex numbers.
I think there are also pr
The data in an R matrix is not stored as double **A, but as double *A: it
is just a vector in R, with attributes.
There are lots of examples of manipulating R matrixes via .C: one is
src/library/stats/src/kmeans.c.
The code for crossprod is not at all hard to find: it is in
src/main/array.c.
