This is probably obvious, but I just wanted to say that it should be possible
to turn off multithreading even when on a machine with multiple cores.
Reasons could be because you run in a cluster, and are given just one core for
yourself.
Or, if you have a setup with trivial parallelization (i.e.
On my trials, after eliminating all the extra matrix<->dgeMatrix conversions,
using expm() and the method below were equally fast.
Michael
On 19 Aug 2011, at 1:32AM, Ravi Varadhan wrote:
> Which is why I said it applies when the system is "diagonalizable". It won't
> work for non-diagonaliza
then from the 1.5 seconds change mentioned below.
So, overall a ~40 fold improvement, though on my machine, the initial ratio was
~3200 times slower, so a ~80 fold slowdown is still present.
Michael
On 17 Aug 2011, at 11:27PM, Michael Lachmann wrote:
>
> On 17 Aug 2011, at 7:08PM,
>
On 17 Aug 2011, at 7:08PM, wrote:
> John C Nash writes:
>
>> This message is about a curious difference in timing between two ways of
>> computing the
>> same function. One uses expm, so is expected to be a bit slower, but "a bit"
>> turned out to
>> be a factor of >1000.
>
> Looks like A
I think one difference is that negll() is fully vectorized - no loops, whereas
nlogL calls the function sol() inside sapply, i.e. a loop.
Michael
On 17 Aug 2011, at 10:27AM, John C Nash wrote:
> This message is about a curious difference in timing between two ways of
> computing the
> same fun
Hi,
I think the help on fitted.values and fitted should mention predict in the "see
also". (And maybe vice versa)
Michael
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Interesting question. It is really about how to avoid the interpretation of \
as an escape character in a string. I wonder if it is possible.
Anyway, have you tried the following:
setwd(readLines("clipboard",warn=F))
"clipboard" is a special filename that tells R to read from the clipboard.
Mic
On 5 Aug 2011, at 1:20AM, Dirk Eddelbuettel wrote:
> When you know the (fixed) structure of the data, the CRAN package mmap can be
> a huge winner.
Thanks! I didn't know that.
Is there a package that provides methods for mmap, like sum(x) or maybe even
y=x+z
where x, and z are mmaps?
I assume
On 4 Aug 2011, at 11:50PM, Simon Urbanek wrote:
>
> On Aug 4, 2011, at 5:26 PM, Michael Lachmann wrote:
>
>> Hi,
>>
>> I was trying to have R read files faster with readChar(). That was before I
>> noticed that readChar() is not that bad! In any case, below I
changes are also not that hard - I'd do them if people think such
changes should be included
Thanks for listening,
Michael Lachmann
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ot seem to come after the image neither
> (this is perhaps to be expected from the note in ?plot.default).
>
> plot(1,1, panel.last={box(lwd=50, col="#FF")})
>
> image(volcano, panel.last={box(lwd=50, col="#FF")})
>
> sessionInfo()
> R versio
n image.default() the box is drawn,
before or after
.Internal(image(as.double(x), as.double(y), as.integer(zi),
col))
is called, the resulting eps has the box in front.
Michael
On 3 Aug 2011, at 9:25AM, Michael Lachmann wrote:
> When R generates density plots and these are exported
t to
overwrite part of the lines of the axes. But that is probably a change in the
image() routine, not in the postscript driver
Thanks for listening,
Michael Lachmann
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Michael Lachmann wrote:
>
>
> Duncan Murdoch-2 wrote:
>>
>>
>> What version are you using? I don't see that in current R patched.
>>
>>
>
> I see this in version 2.11.1.
> This is the code I ran to generate it:
> page <- utils
Hi,
The following was already a topic on r-help, but after understanding what is
going on, I think it fits better in r-devel.
The problem is this:
When a data.frame has another data.frame in it, rbind doesn't work well.
Here is an example:
--
> a=data.frame(x=1:10,y=1:10)
> b=data.frame(z=1:10)
Ulrike Grömping wrote:
>
>
> However, given the documentation that partial matching is not used on
> the left-hand side, I would have expected even more that the assignment
>
> sw$Fert[1] <- 10
>
> works differently, because I am using it on the left-hand side.
> Probably, extraction ([1])
Duncan Murdoch-2 wrote:
>
>
> What version are you using? I don't see that in current R patched.
>
>
I see this in version 2.11.1.
This is the code I ran to generate it:
page <- utils:::.getHelpFile(?options)
tools::Rd2HTML(page,out="t.html")
in the generated file, t.html, the first tag i
I think tools::Rd2HTML has a problem with the dl tag.
Under some conditions, and , and and are not nested
correctly.
Here is an example from the "options" doc file:
--
save.defaults, save.image.defaults:
see save.
--
You can see that the starts, then starts, then end the
paragraph, but th
.ans))
dn.ans <- vector(mode = "list", length(d.ans))
dn.ans <- c(list(ans.names), dn.ans)
return(array(ans, c(len.a%/%d2, d.ans), if (!all(sapply(dn.ans,
is.null))) dn.ans))
}
return(ans)
}
--
Thanks,
Michael
--
Michael Lachmann, Max Planck institute of evolutionary anthropology
Deutscher Platz. 6, 04103 Leipzig, Germany
Tel: +49-341-3550521, Fax: +49-341-3550555
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