Yes, thanks. I think I know where this is coming from and will discuss
with Duncan Murdoch who was working on this topic recently.
Best,
Uwe
On 13.07.2011 20:06, Robert J. Hijmans wrote:
There seems to be a bug in "image" in R 13.1 (on windows 32& 64 bits) and
on R-devel that is not pre
I am writing a wrapper function in C++ that calls a GPU kernel. My array type
for the GPU kernel is float, so I would like my wrapper function to receive
float arrays from R. I understand that I can use 'as.single' in R to copy a
double-precision vector from R in single-precision format while using
I've packaged the test library up as a tar file at
ftp.mayo.edu
directory therneau, file ktest.tar
login username: mayoftp
password: KPlLiFoz
This will disappear in 3 days (Mayo is very fussy about outside access).
In response to Uwe's comments
1. "2.13.0"
On 18/07/2011 11:52 AM, Alireza Mahani wrote:
I am writing a wrapper function in C++ that calls a GPU kernel. My array type
for the GPU kernel is float, so I would like my wrapper function to receive
float arrays from R. I understand that I can use 'as.single' in R to copy a
double-precision vect
*Initially, I posted this topic in R-help however, folks there
suggested me to post this in R-devel forum. Here is my
problem*
Hi all, I am trying to understand the R's "environment" concept
however the underlying help files look quite technical to me. Can
experts here provide me
On 2011-07-18, at 11:52 AM, Nipesh Bajaj wrote:
> Hi all, I am trying to understand the R's "environment" concept
> however the underlying help files look quite technical to me. Can
> experts here provide me some more intuitive ideas behind this concept
> like, why it is there, what exactly it is
Here is an attempt at the general concept without getting technical.
How many people in the world answer to the name/title "Dad"?
Yet based on context we can usually tell who someone is talking about when they
use "Dad".
It is the same in programming, I may write a function which includes a v
If x contains an NA then filter(x, f, method="recursive")
puts NA's and 0.0's in the output in an odd pattern.
It puts NA's in the length(f) positions ending at the position
of the input NA and it puts a run of length(f) 0.0's starting
at the position immediately after the input NA. The values
aft
1) R-help is the wrong list: see the posting guide. I've moved this
to R-devel.
2) A glibc system should not be compiling in that directory. glibc
2.14 is rather recent and NEWS does say
* The RPC implementation in libc is obsoleted. Old programs keep working
but new programs cannot be l
Duncan,
Thank you for your reply. This is a rather unfortunate limitation, because
for large data sizes there is a significant difference between the
performance of '.C' and '.Call'. I will have to do some tests to see what
sort of penalty I incur for copying from double to float inside my C++ cod
On Jul 18, 2011, at 6:15 PM, Alireza Mahani wrote:
> Duncan,
>
> Thank you for your reply. This is a rather unfortunate limitation, because
> for large data sizes there is a significant difference between the
> performance of '.C' and '.Call'.
I think you may have missed the main point - R do
Simon,
Thank you for elaborating on the limitations of R in handling float types. I
think I'm pretty much there with you.
As for the insufficiency of single-precision math (and hence limitations of
GPU), my personal take so far has been that double-precision becomes crucial
when some sort of erro
On Mon, 18 Jul 2011, Allin Cottrell wrote:
On Mon, 18 Jul 2011, Prof Brian Ripley wrote:
1) R-help is the wrong list: see the posting guide. I've moved this to
R-devel.
2) A glibc system should not be compiling in that directory. glibc 2.14 is
rather recent and NEWS does say
* The RPC i
On Mon, 18 Jul 2011, Alireza Mahani wrote:
Simon,
Thank you for elaborating on the limitations of R in handling float types. I
think I'm pretty much there with you.
As for the insufficiency of single-precision math (and hence limitations of
GPU), my personal take so far has been that double-pr
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