Displaying 20 results from an estimated 43 matches for "matthewckeller".
2010 Apr 25
4
how to make read in a vector of 0s and 1s with no space between them
...10100101001011101011
and I want to pull that into R as a vector, but with each digit being
it's own element. There are no separators between the digits. How can
I accomplish this? Thanks in advance!
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2007 Nov 08
3
skip non-sequential lines using scan?
...,2)) rather than 5, 7, 9, ... 99. Yes, I know I can
accomplish this by looping, but with the huge datasets I'll be working
with, I'd like to try to save time by doing it all at once. Any ideas?
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2009 May 20
1
how to get remote ESS graphics to work?
...Does anyone out there use interactive graphics on their ESS remote
sessions? If so, could you provide any help? We're really stuck and
just need a step-by-step from anyone who knows.
Thank you,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2008 Jan 15
9
things that are difficult/impossible to do in SAS or SPSS but simple in R
...examples of
problems that they couldn't do in one of those packages but that could
be done easily in R? Similarly, if there are any examples of the
converse I would also be interested to know.
Best,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2009 Mar 11
2
non-positive definite matrix remedies?
...al I suppose until it becomes
positive definite. Does anyone have any other ideas on how to deal
with this problem, and what the strengths and weaknesses of different
approaches are?
Thanks in advance,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2011 May 30
3
ideas about how to reduce RAM & improve speed in trying to use lapply(strsplit())
...have ideas about how to speed up the code above and (more
importantly) reduce the RAM footprint? I'd prefer not to change the
file on disk using, e.g., awk, but I will do that as a last resort.
Best
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2007 Nov 01
2
unable to install package ff
...uot; "grDevices" "utils" "datasets"
"methods" "base"
Any ideas how to get ff to install properly on my system? Most
appreciative of any advice!
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2010 Feb 05
1
maximum elements in an ff object?
...e it because 19e9 is >> .Machine$integer.max = 2^31.
Anyone else have suggestions on how to deal with such massive datasets
like the ones I'm using? I'm exploring ncdf as we speak. Best,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2011 May 29
1
why does scan(gzfile("file"), what='integer') import data as mode "character" ?
...re no NAs introduced by coercion, so
the vector really is all integer.
Also, is the above code the fastest for importing a very long zipped
data, with 132 million rows and 1 column?
Thanks in advance,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2008 Jul 27
1
64-bit R on Mac OS X 10.5.4
...urday, July 26, 2008 9:15:41 AM
Subject: Re: [R] 64-bit R on Mac OS X 10.4.5
Hi Joseph,
For what it is worth (which might not be that much!), I have written
down step by step instructions on my website for getting 64 bit R
working under Leopard - it should be much different with Tiger:
http://www.matthewckeller.com/html/64_bit_r_on_mac.html. I think it'll
work but there may be some mistakes in there. I'd be happy to take
suggestions...
Matt
On Fri, Jul 25, 2008 at 7:23 PM, Steven McKinney <smckinney at bccrc.ca> wrote:
>
> Hello
>
> I haven't found better instructions, it...
2011 Aug 19
1
how to merge distance data based on location
...ill be
deletions that overlap. So I'd like:
1003 1023 852 5305 1010 1015
5932 6120
8500 9500
12348 12689 10000 13000
Does anyone have ideas about how to accomplish this?
Thank you,
Matthew Keller
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2009 Jun 17
1
how to interpolate time series data with missingness
...ernatively, that could figure out a more likely value than just
the average. There must be something simple I'm overlooking, like some
kind of loess y-hat or something? Any help would be appreciated,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2010 Mar 15
2
[R-SIG-Mac] How to interrupt an R process that hangs
...t; In these situations, is there an option other than killing R (and the
> work you've done on your script to that point)?
>
> Thank you,
>
> Matthew Keller
>
>
> --
> Matthew C Keller
> Asst. Professor of Psychology
> University of Colorado at Boulder
> www.matthewckeller.com
>
> _______________________________________________
> R-SIG-Mac mailing list
> R-SIG-Mac at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>
2012 Jul 30
1
how to sort huge (> 2^31 row) dataframes quickly
...;t turn up an ability to sort like this,
but again, maybe I'm wrong. My computer programmer writes in C++, so
if you have ideas in C++, that works too.
Any help would be much appreciated... Thanks!
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2007 Oct 21
4
Input appreciated: R teaching idea + a way to improve R-wiki
...more than snippets of conversations from this list-serve (often sans
the context). My guess is that the "Guides" section is where these
should go.
Your input would be most appreciated. Best,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2012 Feb 21
1
tapply for enormous (>2^31 row) matrices
...ed up using
bigsplit, let me know). If another package (e.g., an SQL package) can
do something like this efficiently, I'd like to hear about it and your
experiences using it.
Thank you in advance,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2011 May 28
3
Changing the name of the "R" process in top
...ocess
is related to which R script. Is there a way to rename a specific
instantiation of an R process in top with another, more informative
name, e.g., something like R-script1 R-script2 etc?
Thank you,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2008 Sep 08
1
correct lme syntax for this problem?
...ariate1 + covariate2, random = ~
1 | population))
anova(mod1,mod2) #this checks whether there is evidence for IQ & SPI
being related differently between the 5 populations.
Is this correct? THANKS!
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
2017 Oct 02
2
fwrite() not found in data.table package
...kages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] data.table_1.10.5
loaded via a namespace (and not attached):
[1] tools_3.2.0 chron_2.3-47 tcltk_3.2.0
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
[[alternative HTML version deleted]]
2009 Oct 12
2
Error: cannot allocate vector of size 1.2 Gb
Dear List,
today I turn to you with a next problem. I'm trying to compare species
richness between various datasets (locations) using species accumulation
curves (Chapter 4, page 54 in Tree diversity
analysis<http://www.worldagroforestry.org/treesandmarkets/tree_diversity_analysis.asp>by
Kindt & Coe). To accomplish this I'm using package
BiodiversityR. My data is comprised of