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
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
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 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
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
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
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
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
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
*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 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
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"
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
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
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