Displaying 20 results from an estimated 10000 matches similar to: "Computing means, variances and sums"
2003 Dec 30
1
Accuracy: Correct sums in rowSums(), colSums() (PR#6196)
Full_Name: Nick Efthymiou
Version: R1.5.0 and above
OS: Red Hat Linux
Submission from: (NULL) (162.93.14.73)
With the introduction of the functions rowSums(), colSums(), rowMeans() and
colMeans() in R1.5.0, function "SEXP do_colsum(SEXP call, SEXP op, SEXP args,
SEXP rho)" was added to perform the fast summations. We have an excellent
opportunity to improve the accuracy by
2013 Dec 16
4
1.1 Much slower on Raspberry Pi
I have just started trying Opus with a view to using it in a project. I am
interested in embedded hardware and tried it on the Raspberry Pi using the
raspbian distro.
The version of libopus in the repos is 0.9.14. I installed this and tried
encoding 2 minutes of speech from a librevox recording. It managed this at
a respectable pace for complexity 10:
Skipping chunk of type "LIST",
2001 Sep 11
3
64-bit programming
Has R been ported to 64-bit platforms? E.g. as in FORTRAN when you
define
double precision number as:
REAL*16
I have heard that some SUN computers already offer 64-bit architecture
but I am unsure
about the GNU support for that hardware. I am seeking increased
accuracy in floating
point operations.
regards
Helgi
--
Helgi Tomasson FAX: 354-552-6806
2013 Dec 19
1
Opus Major Version Benchmarks on Raspberry Pi
I wanted to roughly benchmark how the different version of libopus
performed at each complexity level for a 6kbit/s output opus file. This was
conducted on a Raspberry Pi so it is a constant hardware platform. This was
done on an early Pi so only 256MB RAM but it was never used up so should
not make a difference.
I compiled the three final versions of each major release of libopus so
that was
2004 Apr 06
0
Accuracy Bug (PR#1228), (PR#6743)
>>>>> "daheiser" == daheiser <daheiser@gvn.net>
>>>>> on Tue, 6 Apr 2004 04:24:35 +0200 (CEST) writes:
daheiser> It is an error in the algorithm.
"it" being the behavior reported in bug report PR#1228 ---
[too bad you didn't use the whole string "PR#1228" in your subject;
if you had, no new report would have
2010 Jun 24
5
Best way to compute a sum
> a <- 0 ; for(i in (1:200000000)) a <- a + 1/i
> b <- 0 ; for(i in (200000000:1)) b <- b + 1/i
> c <- sum(1/(1:200000000))
> d <- sum(1/(200000000:1))
> order(c(a,b,c,d))
[1] 1 2 4 3
> b<c
[1] TRUE
> c==d
[1] FALSE
I'd expected b being the largest, since we sum up the smallest
numbers first. Instead, c is the largest, which is
2019 Apr 10
2
[RFC] New Clang target selection options for ARM/AArch64
Hi Manoj,
Not too late at all, we have not got to that point of the work yet.
Are there examples of this kind of build setup that are available publicly? I think I understand the problem but it'd help to see one in action. To see if there are any other Arm extensions that are already being added like this and whether those systems support GCC and how.
Thanks,
David Spickett.
2013 Dec 20
2
Benchmarks on Pi
Hi All,
What would be interesting would be a plot of complexity versus subjective or
object audio quality.
I've not had a chance to look at the new analysis code in 1.1 so maybe in
the case of a 6kbps compression you could clarify what decisions would it be
making that would justify the extra complexity?
Best Regards
Cliff Parris
-----Original Message-----
From: opus-request at
2019 Nov 14
4
Understanding targets
Hello Paul and Simon, (Sorry - I'm not sure about the social conventions in mailing lists)
Both of your answers helped me a lot! So If I understand it correctly, Clang knows what 'mips1' and 'mips5' are - but can't generate code for it? Why is it like that?
I actually have a more in general questions about processors... If this is the wrong place for it, please ignore it,
2019 Apr 16
2
[RFC] New Clang target selection options for ARM/AArch64
Hi Manoj,
I tried a few other options myself:
* function 'target' attribute - the list of extensions this supports isn't complete and it doesn't enable the ACLE macros needed for intrinsics
* manually defining ACLE macros - this allows intrinsics and is additive but assumes that you're not relying on codegen to emit instructions. I don't think it helps the bug linked
2006 Feb 08
1
corruption of data with serialize(ascii=TRUE)
I noticed the following peculiarity with `serialize()' when `ascii = TRUE' is
used. In today's (svn r37299) R-devel, I get
> set.seed(10)
> x <- rnorm(10)
>
> a <- serialize(x, con = NULL, ascii = TRUE)
> b <- unserialize(a)
>
> identical(x, b) ## FALSE
[1] FALSE
> x - b
[1] -3.469447e-18 2.775558e-17 -4.440892e-16 0.000000e+00
2018 Sep 21
5
[RFC] New Clang target selection options for ARM/AArch64
Hi,
Below is a document detailing changes we'd like to make to Clang/LLVM to improve the usability of the target options for ARM and AArch64.
To keep things simple the proposed changes are listed at the start and you can find the supporting examples at the end of the document.
I look forward to your feedback.
Thanks,
David Spickett.
RFC New Clang target feature selection options for
2015 Jun 30
4
Why doesn't R have a float data type?
This is strictly a curiosity question. I am aware the R doesn't possess a
float data type. I also don't mean to request that such functionality be
implemented as I'm sure it would require a large amount of work with
potential back compatibility conflicts. But I wanted to know why R has
never had a float data type available?
Regards,
Charles
[[alternative HTML version deleted]]
2019 Apr 12
2
integrate over an infinite region produces wrong results depending on scaling
Dear all,
This is the first time I am posting to the r-devel list. On
StackOverflow, they suggested that the strange behaviour of integrate()
was more bug-like. I am providing a short version of the question (full
one with plots: https://stackoverflow.com/q/55639401).
Suppose one wants integrate a function that is just a product of two
density functions (like gamma). The support of the
2001 Jun 06
3
error in dbeta (PR#970)
Full_Name: Hans Peter Wolf
Version: 1.2.1
OS: hpux10.20
Submission from: (NULL) (129.70.84.25)
dbeta computes a wrong result with parameters (1.3,1)
> version
platform hppa2.0-hp-hpux10.20
arch hppa2.0
os hpux10.20
system hppa2.0, hpux10.20
status
major 1
minor 2.1
year
2013 Dec 21
5
Benchmarks on Pi
I have run a few more test at different bitrates and 1.1 is looking even
worse in terms of speed compared to previous versions.
I have shared a google sheet which has the raw data and charts for 6,16 and
32 kbps. Unfortunately you cannot show proper error bars on Google sheets
but the standard deviation is in the data if you want to look. You can see
that the profile for 1.1 is a lot different
2013 Dec 17
0
1.1 Much slower on Raspberry Pi
On Mon, Dec 16, 2013 at 5:03 AM, Stuart Marsden
<stuartmarsden at finmars.co.uk> wrote:
> I have just started trying Opus with a view to using it in a project. I am
> interested in embedded hardware and tried it on the Raspberry Pi using the
> raspbian distro.
>
> The version of libopus in the repos is 0.9.14. I installed this and tried
> encoding 2 minutes of speech from a
2018 Jul 02
2
base::mean not consistent about NA/NaN
And for a starker example of this (documented) inconsistency,
arithmetic addition is not commutative:
> NA + NaN
[1] NA
> NaN + NA
[1] NaN
On Mon, Jul 2, 2018 at 5:32 PM, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
> On 02/07/2018 11:25 AM, Jan Gorecki wrote:
>> Hi,
>> base::mean is not consistent in terms of handling NA/NaN.
>> Mean should not
2006 Nov 16
1
Looking for greater floating-point precision
Dear All
For my calculations, I am needing to use more floating-point precision
than the default one of R. Is that possible? And, if yes, how?
Thanks in advance,
Paul
2009 Aug 20
1
how to compute this summation...
Dear R users,
I try to compute this summation,
http://www.nabble.com/file/p25054272/dd.jpg
where
f(y|x) = Negative Binomial(y, mu=exp(x' beta), size=1/alp)
http://www.nabble.com/file/p25054272/aa.jpg
http://www.nabble.com/file/p25054272/cc.jpg
In fact, I tried to use "do.call" function to compute each u(y,x) before the
summation, but I got an error, "Error in X[i, ]