I am having trouble handing raw data to a C function, using cfunction, as
demonstrated in the function and output pasted below. Can anyone suggest what
I'm doing incorrectly? Thanks. Dan Kelley [Dalhousie University].
1. TEST FILE
library(inline)
code - 'Rprintf(inside f(), b is 0X%x\\n
), 0x0f);
return(R_NilValue);'
f - cfunction(sig=signature(b=raw),
body=code,
convention=.Call)
b - as.raw(0x0f)
for (i in 1:5)
f(b)
On 2012-03-17, at 2:49 PM, Dirk Eddelbuettel wrote:
On 17 March 2012 at 14:34, Dan Kelley wrote:
| I am having trouble handing
=code,
verbose=TRUE,
convention=.Call)
b - as.raw(0x0f)
for (i in 1:5)
f(b)
On 2012-03-17, at 3:02 PM, Dan Kelley wrote:
Thanks. .Call is better. But how do I get the actual value of the byte
(0F)? (Updated code below. I does not compile if I use as_RAW(*b
think a convention might help,
what would that convention be?
Dan Kelley, PhD
Professor and Graduate Coordinator
Dept. Oceanography, Dalhousie University, Halifax NS B3H 4J1
kelley@gmail.com (1-minute path on US server) or dan.kel...@dal.ca (2-hour
path on Cdn server)
Phone 902 494 1694; Fax
be in ascending order, starting at some azimuth 0
degrees.
# The oce package was written by Dan Kelley.
# Arguments:
# 1) vector of windspeeds
# 2) vector of wind directions (azimuths, degrees; 0=calm, 45=NE,
90=E,
180=S, 270=W, 360=N)
#AZIMUTH DEGREES ARE COMPASS BEARINGS
# 3) vector
Update: I could not get RNetCDF working because I couldn't install udunits
version 1 properly, and udunits2 is not the right version.
However, returning to the original post, I *did* get ncdf working. Just
install it from source. Then, you can do as e.g. below
pre
library(ncdf)
jpeg(SSS.jpg,
I think ncdf is broken now, and so is Rnetcdf. I can't build from source,
either. If I find a solution, I'll post it here. FYI, I have an
intel-based Mac running the latest OS and with R 2.9.1
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Right. I have udunits2 installed, but that's not enough. It seems to want
udunits, instead, even though the latter is deprecated.
I downloaded the older package from
http://www.unidata.ucar.edu/downloads/udunits/index.jsp
but it does not compile, e.g.
../port/cfortran/cfortran.h:133:3:
I'm afraid I am missing something. In my R function (call it foo, say) I
am doing something like
foo - function() {
...
.C(bar, ..., res=integer(n), ...)$res
}
but I don't know the n to use; that is determined inside my C function
bar. Is there a way around this?
Self-posting the solution, to help those who come across this thread with a
similar interest --
My solution, arrived at with the generous help of those who have replied to
my question, was to use .Call, as exemplified below. My task was to find
indices in a raw buffer (input) that match a
I am trying to write a C function to create a vector of integers that can be
used by the R calling function. I do not know the size of the vector in the
R calling function. (Well, actually, I have an upper limit on the size, but
that is so large that R cannot allocate it. What I'm doing in the
Some time ago, I posted a note about what I considered to be a bug in
axis.POSIXt() for R 2.8.x, relating to whether timezones in the data are
obeyed on the axes. A link to that note, and to a quick and helpful
response, is at the following URL
I have written a function for my 'oce' package that creates a data.frame
containing a variable name with a prime in it. (I use prime to indicate
coordinate rotation, a reasonably standard convention that motivates the odd
variable name.)
How can I name that in an Rd file? I tried \code{u'} but
Is there a way to specify a *vector* of statements, as an argument to a
function. What I'm trying to do is to provide the ability to add elements
to a series of panels drawn by a function. (As documented, split.screen
does not provide this capability.) My idea is to mimic the 'plot.axes'
That works perfectly. Thanks very much!!
Duncan Murdoch-2 wrote:
On 15/04/2009 6:31 AM, Dan Kelley wrote:
Is there a way to specify a *vector* of statements, as an argument to a
function.
There are several ways. expression() converts its arguments into a
vector of expressions, e.g
I'm trying to follow along in a text by Velleman and others, with the
'handwashing' example of anova. I used read.table() to read the data, and
now I have an object d (put below the dots here), with an entry Method that
has possible values Water, Soap, etc. What I can't figure out is how to
I have data in a file named hands.dat, which is given at the end of this
question. (It's from a stats textbook example on anova). I'd like to do an
aov on this, which I guess would be
d - read.table(~/hands.dat, header=TRUE)
aov(Bacterial.Counts ~ Water + Soap + Antibacterial.Soap +
As a followup, I show below what I get if I break out the variables by
making a new data frame with new (boolean) columns that indicate the
treatment. (The experiment was germ count on hands, after cleansing with 4
different methods.)
What I'm hoping is to find a way to do this in a less
I am trying to plot two things on one graph, with a y-axis at the left for
one variable, and a y-axis at the right, for the other variable. I thought
I could do as follows
par(mar=rep(4.5, 4))
plot(0:10, 10:20)
par(new=TRUE)
plot(0:10, 100:110, axes=FALSE)
axis(4)
but this writes both y-axis
Duncan Murdoch-2 wrote:
...Are you really sure you want a graph with two different scales on it?
Thanks, Duncan. I'll use mtext. It is common for people in my research area
to put several axes on plots. The top two panels from
library(oce)
data(ctd)
plot(ctd)
shows this. Actually,
I just installed Rcmd on my OSX-10.5 32-bit powerpc box, with R 2.8.1, and it
seems to work (see below). Beyond that, I can't help, since I've not used
this package. Good luck!
library(Rcmdr)
Loading required package: tcltk
Loading Tcl/Tk interface ... done
Loading required package: car
Thanks very much, Duncan. In case it's of interest to others who encounter
this thread later, I am pasting below the code I wrote. It is for the 'oce'
package for oceanographic data, which explains the reversal of the y axis,
forming a so-called 'profile', in which the top of the graph
Is there a way a function ('parent', say) can manipulate the ... argument,
and then pass the manipulated value into another function ('child', say)
that it calls?
What I'm trying to do is to use some plotting defaults within 'parent' that
are not part of parent's argument list, but to let the
Is there a way a function ('parent', say) can manipulate the ...
argument, and then pass the manipulated value into another function
('child', say) that it calls?
What I'm trying to do is to use some plotting defaults within 'parent'
that are not part of parent's argument list, but to let
Oh, I'm sorry to be posting a reply to my own stupid question, but the
problem is that I had not specified GMT, and so it was using local time,
which changes to 'save daylight. This is demonstrated below:
unclass(as.POSIXct(1975-04-27,tz=GMT))[1]-unclass(as.POSIXct(1975-04-28,tz=GMT))[1]
[1]
Thanks, that article is very helpful. D.
Gabor Grothendieck wrote:
Read relevant article in R News 4/1.
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Sent from the R help mailing list archive at Nabble.com.
The technique
d - get(d, pos=globalenv())
doesn't work for me. It just says that it cannot get d, even though I
have a data/d.rda file.
Do I have to do something special with namespaces, to find it?
PS. a possibly-related link is as follows.
Yes, data() works, but then I have this warning from R CMD check on my
package, so I think I should not be doing it that way.
Benilton Carvalho wrote:
have you tried
data()
instead?
b
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My R CMD check gives me
fit.tide: no visible binding for global variable ‘tideconst’
when I do
load(paste(system.file(package=oce),data/tidesetup.rda,sep=/))
... try to use tideconst ...
where tidesetup.rda holds, among other things, a variable named tideconst.
I guess I can see why
, pos=globalenv())
Uwe Ligges
Dan Kelley wrote:
Yes, data() works, but then I have this warning from R CMD check on my
package, so I think I should not be doing it that way.
Benilton Carvalho wrote:
have you tried
data()
instead?
b
QUESTION: is there a way to make objects (e.g. data frames) read-only?
BACKGROUND: I am writing some functions that use a data frame (frequencies
of tidal constituents) that I want to be read-only. I can see how to
accomplish this within a single function (just define the data in the
function),
to the whole R-help list (I hope that is correct protocol), in case
anyone later on comes across the question and wants to know how it
proceeded.
Again, Uwe, thanks for the advice.
Dan Kelley.
On 2007-10-23, at 8:36 AM, Uwe Ligges wrote:
Why don't you create a device that is approximately squared
I've been using (and loving) R for quite a while now, but I have to
admit that something simple is still stumping me.
The question is how I can control the box within which a plot is
drawn, in cases where I'm controlling the aspect ratio with the asp
argument.
The problem comes up in pdf()
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