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>>>>> Richard O'Keefe >>>>> on Mon, 6 Nov 2023 18:37:34 +1300 writes: > Thanks to all who replied. On Mon, 6 Nov 2023 at 18:37, > Richard O'Keefe <raoknz at gmail.com> wrote: >> OK, so the consensus is (1) One cannot make strptime >> accept ISO...

Thanks to all who replied. On Mon, 6 Nov 2023 at 18:37, Richard O'Keefe <raoknz at gmail.com> wrote: > OK, so the consensus is > (1) One cannot make strptime accept ISO8601-compliant zone designators > (2) The lubridate package can > (3) Or one can hack away with regex. > Lubridate...

On Tue, 30 Jan 2024, Richard O'Keefe writes: > Given > - UTC timestamp > - a location (latitude,longitude,elevation) > I want to know > - the sun angles > - the moon angles > - the phase of the moon. > I looked on CRAN for astronomy, but didn't notice anything th...

OK, so the consensus is (1) One cannot make strptime accept ISO8601-compliant zone designators (2) The lubridate package can (3) Or one can hack away with regex. Lubridate it is, then. But I do regard strptime's inability to process ISO8601-compliant zone designators as a bug. On Mon, 6 Nov 20...

A student is trying to cluster some data. Tree-building things seem to be pretty hopeless (we've tried most of the ones in R, I think). Multi-dimensional scaling produces somewhat tantalising results: things do clump together somewhat, but the clusters overlap a lot. I was wondering if these was an artefact of squee...

> On Jun 6, 2019, at 2:04 PM, Richard O'Keefe <raoknz at gmail.com> wrote: > > How can expanding tildes anywhere but the beginning of a file name NOT be > considered a bug? > > I think that that IS what libreadline is doing if one allows a whitespace separated list of file...

What's the reommended way, in R, to determine the strength of association between a discrete variable and a continuous variable? Yes, I have read the manuals, trawled the archives, &c.

I have some data that includes timestamps like this: 2017-02-28T13:35:00+03:00 The documentation for strptime says that %z expects an offset like 0300. I don't see any way in the documentation to get it to accept +hh:mm with a colon separator, and everything I tried gave me NA as the answer. Section 4....

"It would be really really helpful to have a clearer idea of what you are trying to do." Amen! But in R, "constructing" objects by extending them piece by piece is generally very inefficient (e.g. https://r-craft.org/growing-objects-and-loop-memory-pre-allocation/), although someti...

I have found XLispStat's spinning plots illuminating. I'd like to do the same thing in R. A dozen or so probes with help, help.search, apropos haven't turned up anything, and I've even resorted to grepping through the entire R source distribution looking for 'spin.*plot', to no avail....

While reading through some of the R source code, I have come across forms such as m$... m$... <- e and I wondered what they meant. ?"$" mentions x$name, but not $... All it says is The operators `$' and `$<-' do not evaluate their second argument. It is translated to a st...

There is also the package solrad that might do some of this. It is more intended for calculating solar radiation, which is probably not what you want, but may do other things you may find helpful. > On Jan 30, 2024, at 5:44?AM, Enrico Schumann <es at enricoschumann.net> wrote: > > On Tue, 30 Ja...

The matrix equivalent of x <- ... v <- ... x[length(x)+1] <- v is m <- ... r <- ... m <- rbind(m, r) or m <- ... k <- ... m <- cbind(m, c) A vector or matrix so constructed never has "holes" in it. It's better to think of CONSTRUCTING vectors and matrices rather...

Is that a method where a program that I write today would still run without changes in 10 years? Tim -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of Richard O'Keefe Sent: Wednesday, October 11, 2023 8:08 AM To: Uwe Ligges <ligges at statistik.tu-dortmund.de>...

On Wed, 5 Jun 2019 18:07:15 +0200 Frank Schwidom <schwidom at gmx.net> wrote: > +> path.expand("a ~ b") > [1] "a /home/user b" > How can I switch off any file crippling activity? It doesn't seem to be possible if readline is enabled and works correctly....

----- Original Message ----- From: "Richard A. O'Keefe" <ok at cs.otago.ac.nz> To: <paul at datavore.com> Sent: Thursday, September 04, 2003 2:56 AM Subject: Re: [R] Overlaying graphs > I do not know how to overlay the curve graphic on top of hist graphic. > > Do you k...

Hello, R 3.6.0 on Ubuntu 19.04. Since no one mentioned it, notice that the tilde in the middle of a string needs to be surrounded by spaces to be expanded. The first code line works as expected, only the second is wrong (buggy). path.expand('a~b') #[1] "a~b" path.expand('a ~ b...

I asked: > In this discussion of seq(), can anyone explain to > me _why_ seq(to=n) and seq(length=3) have different > types? Martin Maechler <maechler@stat.math.ethz.ch> replied: well, the explantion isn't hard: look at seq.default :-) That's the "efficient cause", I was after the "f...

try using 'lubridate' > library(lubridate)Attaching package: ?lubridate? The following objects are masked from ?package:base?: date, intersect, setdiff, union > x <- "2017-02-28T13:35:00+03:00"> ymd_hms(x)[1] "2017-02-28 10:35:00 UTC" > Thanks Jim Holtman *Data Munger Guru* *What is the problem that you are trying to solve?Tell me wh...

You could declare a matrix much larger than you intend to use. This works with a few megabytes of data. It is not very efficient, so scaling up may become a problem. m22 <- matrix(NA, 1:600000, ncol=6) It does not work to add a new column to the matrix, as in you get an error if you try m22[ , 7]...