Displaying 20 results from an estimated 1000 matches similar to: "Q: how to submit documentation patches?"
2004 Aug 27
1
Plotting irregular grid as image or persp
Hi,
I have an array of 2d node locations and an array triangles, and would
like to plot something like a image or persp.
An example of doing it with rgl is:
library(ncdf)
library(rgl)
# wget http://www.maplepark.com/~drf5n/extras/teapot.nc
teapot<-open.ncdf("teapot.nc")
z<-get.var.ncdf(teapot,"tris")
l<-get.var.ncdf(teapot,"locations")
2007 May 04
1
Partitioning a kde2d into equal probability areas
Hi,
I'd like to partition a 2d probability density function into regions of
equal probability. It is straightforward in the 1d case, like
qnorm(seq(0,1,length=5)) but for 2d I'd need more constraints.
Any suggestions for how to approach this? Is seems like a spatial
sampling problem but I'm not sure where to look.
Thanks for your time,
Dave
--
Dr. David Forrest
drf at
2005 Mar 22
1
sub('^','var',1:3) produces unexpected results
Hi,
According to help(sub), the ^ should match the zero-length string at the
beginning of a string:
sub('^','var',1:3) # "1" "2" "3"
sub('$','var',1:3) # "1var" "2var" "3var"
# This generates what I expected from the first case:
sub('^.','var',11:13) # "var1" "var2"
2006 Feb 21
1
color quantization / binning a variable into levels
Hi all,
I'd like to quantize a variable to map it into a limited set of integers
for use with a colormap. "image" and filled.contour" do this mapping
inside somewhere, but I'd like to choose the colors for plotting a set of
polygons. Is there a pre-existing function that does something like this
well? i.e., is capable of using 'breaks'?
2005 Jun 14
0
Plotting quiver vector tensor arrows 2d field data
Hi All,
I'd like to plot something like
http://www.nawcwpns.navy.mil/~weather/mugu/mesodata/analysis.html
Looking through the galleries at
http://addictedtor.free.fr/graphiques/allgraph.php
http://r-spatial.sourceforge.net/gallery/
http://fawn.unibw-hamburg.de/cgi-bin/Rwiki.pl?GraphGallery
demo(graphics)
I did not find a function to plot a 2d field on a matrix. I did find
mention of a
2007 Jan 11
1
zero margin / marginless plots
Hi,
I'd like to produce a marginless or zero margin plot so that the pixel
coordinates represent the mathematics.
xy<-data.frame(x=c(0,1,1,0,0),y=c(0,1,0,0,1))
png('junk.png',width=300,height=300)
par(mar=c(0,0,0,0))
plot(xy$x,xy$y,xlim=c(0,1),ylim=c(,1))
dev.off()
The resultant file has about a 10 pixel margin around these lines, and I'm
not sure what parameter or function
2007 Jan 08
1
Does strptime(...,tz="GMT") do anything?
Hi All
In trying to correlate some tide gauge data I need to deal with varying
timezones. From the documentation on strptime, it seemed that the tz
variable might have some effect on the conversion, but I'm not seeing an
effect.
> strptime("20061201 1:02 PST",format="%Y%m%d %H:%M",tz="PST")+0
[1] "2006-12-01 01:02:00 EST"
>
2005 Jun 09
1
Plot/manage spatial boundary data
I have some disconnected boundary data from a finite element ocean model
and I'd like to make a plot.
Maptools looks promising, but since my data is not in a shapefile or a
map, I'm unclear on what the best way to approach the problem.
>geom[1:10,]
lon lat depth
1 -75.42481 35.58192 16.172
2 -75.40726 35.58567 18.045
3 -75.41351 35.60312 17.333
4 -75.38888 35.58959
2004 Sep 17
3
Removing constants from a data frame
Suppose I have
x<-data.frame(v1=1:4, v2=c(2,4,NA,7), v3=rep(1,4),
v4=LETTERS[1:4],v5=rep('Z',4))
or a much larger frame, and I wish to test for and remove the constant
numeric columns.
I made:
is.constant<-function(x){identical(min(x),max(x))}
and
apply(x,2,is.constant) # Works for numerics
x[,-which(apply(x,2,is.constant))]
I'd really like to be able to
2003 Jul 11
3
postscript/eps label clipping
The following code produces an eps file with the tops of each of the ylabs
clipped off.
par(mfrow=c(2,2))
plot(runif(10),
ylab="Function(Lengthy Expression)",xlab="Prediction")
plot(runif(10),
ylab=expression(Delta * Beta^2),xlab="Prediction")
plot(runif(10),
ylab="Function(Lengthy Expression)",xlab="Prediction")
2003 Jun 24
1
Reading graphics files
Is there a tool for reading a graphics file into an object? I might not
be looking with the correct vocabulary, but I'm finding lots of references
to producing graphics from R, but not any for inputting graphics into R.
I'd like to use a jpeg image and have the data available in R for
analysis. I could convert the image to another format, PPM perhaps, and
parse that in, GRASS seems like
2005 Mar 23
2
sub('^', .....) bugs (PR#7742)
>>>>> "David" == David Forrest <drf5n@maplepark.com>
>>>>> on Tue, 22 Mar 2005 15:02:20 -0600 (CST) writes:
David> According to help(sub), the ^ should match the
David> zero-length string at the beginning of a string:
yes, indeed.
David> sub('^','var',1:3) # "1" "2" "3"
2005 Aug 24
0
summary: Call SAS from R
Thanks for all the insightful responses that help me solve my problem.
The original question is: how to call SAS from R
The solution is as below:
If my sas code, test.sas, is in directory c:\ncme06\sas codes, then the
following codes works
> system('"c:\\program files\\sas institute\\sas\\v8\\sas.exe"
"c:\\ncme06\\sas codes\\test"')
Things to notice:
1. need a
2019 Oct 09
0
S3 lookup rules changed in R 3.6.1
On 09/10/2019 3:22 p.m., Konrad Rudolph wrote:
> tl;dr: S3 lookup no longer works in custom non-namespace environments as of
> R 3.6.1. Is this a bug?
I don't know whether this was intentional or not, but a binary search
through the svn commits finds that the errors started in this one:
------------------------------------------------------------------------
r75127 | hornik |
2019 Oct 09
2
S3 lookup rules changed in R 3.6.1
tl;dr: S3 lookup no longer works in custom non-namespace environments as of
R 3.6.1. Is this a bug?
I am implementing S3 dispatch for generic methods in environments that are
not
packages. I am trying to emulate the R package namespace mechanism by
having a
?namespace? environment that defines generics and methods, but only exposes
the
generics themselves, not the methods.
To make S3 lookup work
2005 Jan 17
5
find source code
I am using R 2.0.2 on a WinXP
I am trying to get the code of the Kruskal-Wallis test but
> kruskal.test
function (x, ...)
UseMethod("kruskal.test")
<environment: namespace:stats>
> ls(3)
[1] "acf" "acf2AR" "add.scope"
..............
[181] "kruskal.test" "ks.test"
2010 Apr 27
2
when setting environment: target of assignment expands to non-language object
Hi,
I am trying to place my own functions in the nlme environment:
The following statement works:
environment(coef.corSPT) <- environment(getS3method("coef","corSpatial"))
but this one returns an error:
environment(get("coef<-.corSPT")) <-
environment(getS3method("coef<-","corSpatial"))
Error in
2005 Jun 06
9
R Graph Gallery : categorization of the graphs
Hello all,
It seems that the next improvement to the R Graph Gallery is
categorization of the graphics, that way each graph will be easier to
find. That step should be done *carefully* if we want to avoid the
opposite side-effect : graph not reachable through the categories.
That's why the wisdom of the R community is required.
Graphics will be classified in :
- categories
-
2011 Aug 26
1
methods() not listing some S3 plot methods...?
Dear List,
This may be related to this email thread initiated by Ben Bolker last
month: https://stat.ethz.ch/pipermail/r-devel/2011-July/061630.html
In answering this Question on StackOverflow
http://stackoverflow.com/q/7195628/429846 I noticed that `methods()` was
not listing some S3 methods for `plot()` provided by the mgcv package.
At the time I wanted to check the development version of R as
2002 Oct 17
4
Multiple colors in plots/lookup function
Hello,
I'd like to do something like:
n<-100
zz<-cbind(rnorm(n),rnorm(n),floor(runif(n)*3+1))
colors<-c("red","green","blue")
plot(zz,col=colors(zz[3]))
and have a matrix of scatterplots colored by class. The above does not
work, of course, but I'm not sure exactly what function I'm looking for.
Thank you for your time,
Dave,
--
Dave