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-diagonalizable
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
On 17 Aug 2011, at 7:08PM, cbe...@tajo.ucsd.edu cbe...@tajo.ucsd.edu wrote:
John C Nash nas...@uottawa.ca 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
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, cbe...@tajo.ucsd.edu cbe
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.
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
Thanks for listening,
Michael Lachmann
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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 suggest a few
simple changes
. But that is probably a change in the
image() routine, not in the postscript driver
Thanks for listening,
Michael Lachmann
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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 to postscript(
a=matrix(1
,
baptiste
On 4 August 2011 00:23, Michael Lachmann lachm...@eva.mpg.de wrote:
Some more digging.
1.
The following code will fix density plots for me:
---
.ps.prolog=grDevices:::.ps.prolog
i=grep(/p2,.ps.prolog)
.ps.prolog[i] = /p2 { bg gsave fill grestore 0.001 setlinewidth stroke
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]) is done
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)
, 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
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