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marca
2010 Mar 10
3
Help with aggregate and cor
Hello,
I do not understand the correct way to approach the following problem
in R.
I have observations of pairs of variables, v1, o1, v2, o2, etc,
observed every 30 seconds. What I would like to do is compute the
correlation matrix, but not for all my data, just for, say 5 minutes
or 1 hour chunks.
In sql, what I would say is
select id, date_trunc('hour'::text, ts) as tshour,
2000 May 16
1
GPS data import into R
...nal, strip off the identification codes, and then
*do something interesting* with the data, such as plot the
three-dimensional drift statistics. (Obviously the interesting
stuff can be done with existing R packages.)
Any tips or hints on loading NMEA sentences would be appreciated.
James Marca
jmarca at translab.its.uci.edu
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2000 May 01
1
tick marks on mfrow=c(3,3) plot
I am generating an array of similar plots using the par(mfrow=c(3,3))
method. Everything works fine except the plot only puts y-axis tick marks
on cells in column one and x-axis tick marks on cells in row three. I
would like tick marks on both the x and y axix of all 9 plots in my array.
I am generating plots using the following two functions
three.by.three.plot <- function(ss)
{
2011 Nov 04
1
zoo performance regression noticed (1.6-5 is faster...)
Good morning,
I have discovered what I believe to be a performance regression
between Zoo 1.6x and Zoo 1.7-6 in the application of rollapply.
On zoo 1.6x, rollapply of my function over my data takes about 20
minutes. Using 1.7-6, the same code takes about 6 hours.
R --version
R version 2.13.1 (2011-07-08)
Copyright (C) 2011 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform:
2002 May 07
4
attractive spatial point process?
Hi all,
before I roll my own, naive implementation of a particular
spatial point process, I thought I'd ask whether this has
already been done.
Specifically, I am looking for essentially the opposite of the
Strauss and Mate'rn processes included in library(spatial) and
documented in MASS. I am examining daily travel patterns, focusing
on just the destinations of trips, not the