Sorry, missed the top line of code.
library (barsurf)
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and
For a start, there's two local minima.
Add to that floating point errors.
And possible assumptions by the package authors.
begin code
f <- function (x, y, sign)
{ unsign.z <- sqrt (1 - x^2 - y^2)
2 * (x^2 - sign * y * unsign.z)
}
north.f <- function (x, y) f (x, y, +1)
south.f <-
R 4.1.0 was released this week with a new pipe operator and a new anonymous
function shorthand (\(x) x^2).
The pipe operator is not quite as flexible as the magrittr pipe, but it is
faster (not that the magrittr pipe is noticably slow) and built-in.
On May 22, 2021 8:07:27 PM PDT, Caitlin
This is part of the R-4.1.0 release which came out a few days ago.
See
1. https://stat.ethz.ch/pipermail/r-announce/2021/000670.html
2.
https://www.jumpingrivers.com/blog/new-features-r410-pipe-anonymous-functions/
3.
I didn’t know R had a new pipe operator, but I have seen “|>” (without quotes)
used in the Elixir language though. Are there now two? “%>%” from the magrittr
package and “|>” which is built-in?
> On May 22, 2021, at 5:26 PM, Jeff Newmiller wrote:
>
> What is the precedence of the new |> pipe
What is the precedence of the new |> pipe operator? I don't see it mentioned in
?Syntax, nor does it come up when I search the R Language Definition document.
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Several authors hav addressed this problem with names that resemble
"rbindfill". In my machine I find four instances:
??rbindfill
Help pages:
ffbase::ffdfrbind.fill rbind for ffdf where missing columns are
added if not available in one of the ffdf objects
plyr::rbind.fill
Hi Victor,
This issue has been raised in earlier entries in this list. I have not dug
into it myself but the following link was posted as being helpful.
https://askubuntu.com/questions/1286545/what-commands-exactly-should-replace-the-deprecated-apt-key/1307181#1307181
HTH,
Eric
On Sat, May 22,
The source being a URL is not important.
The important things are
- what the structure of the JSON data is
- what the MEANING of the JSON data is
- what that meaning says about what SHOULD appear in the data
from in these cases.
Arguably this isn't even an R question at all. It's a question
I followed the procedure indicated in https://cran.mirror.garr.it/CRAN/
step by step to� install R under ubuntu 21.04 hirsute but� the apt-key
command failed:
vr@ubuntu:~$ apt-key adv --keyserver keyserver.ubuntu.com --recv-keys
E298A3A825C0D65DFD57CBB651716619E084DAB9
Warning: apt-key is
Yes. "*on* the unit sphere" means on the surface, as you can guess
from the equality constraint. And 'auglag()' does find the minimum, so
no need for a special approach.
I was/am interested in why all these other good solvers get stuck,
i.e., do not move away from the starting point. And how to
Sorry, this might sound like a poor question:
But by "on the unit sphere", do you mean on the ***surface*** of the sphere?
In which case, can't the surface of a sphere be projected onto a pair
of circles?
Where the cost function is reformulated as a function of two (rather
than three) variables.
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