search for: matthewckeller

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