Displaying 20 results from an estimated 2000 matches similar to: "Constrained optimization"
2008 Oct 05
2
trouble with character \u00e2
Greetings R-wizards:
For historical reasons I have filenames with the character "?" and have
successfully used "\u00e2" in its place, with the hoped-for result on all my
on-screen plots.
However since R2.7.0 I have trouble with savePlot() when the file name
includes that character as it does in this example:
savePlot(paste("diagnostic ? vs a ", file.label,
2008 Sep 23
4
gsub difficulty
Greetings R-ians:
I know what doesn?t work but I don?t know why, nor how to remedy things.
I have a character string containing "." which I want to replace with " "
gsub(".", " ", file.label) replaces the every character with a blank.
However gsub(".xls", " ", file.label) replaces ".xls" with a blank as
expected.
It appears
2008 Aug 14
5
help with my sloppy syntax
R-ians:
After some effort I coerced my code to do what I want but my syntax is a
kludge. Suggestions on more elegant syntax?
par <- NIM.results$par
do.call("Draw.NIM.POD.curve", list(par[1], par[2], par[3], par[4],
par[5], a.hat.decision, .... et cetera ...
It seems that I should be able to avoid defining the variable "par" and then
specifying each of its elements,
2008 Jan 26
3
Which R version created a package?
Greetings, R-ians:
I would like to know which version or R was used to create a given package.
I think I remember seeing that topic discussed recently but cannot find it
among my notes. Can anyone tell me how to determine which version of R
created a package?
Thanks.
Charles Annis, P.E.
<mailto:Charles.Annis@StatisticalEngineering.com>
Charles.Annis@StatisticalEngineering.com
2006 Sep 29
3
control L to clear the Rgui screen in Windows
Greetings R-ians:
Searching the Searchable Mail Archives I discovered that ctrl L will clear
the Rgui screen, which is what I'd like to do from a print (or some similar)
statement.
Is there a mechanism to use the ctrl L clear-screen sequence in a script, or
print statement?
Thanks for your counsel.
Charles Annis, P.E.
Charles.Annis at StatisticalEngineering.com
phone: 561-352-9699
eFax:?
2006 Jul 09
4
string problems with "\\" (Windows)
Greetings, R-ians:
I'm using R 2.3.1 on WindowsXP.
I need to find the name of a file at the end of a sting that contains the
path + file, with the problematic "\\" as separators.
The string looks something like this:
"C:\\Documents and Settings\\myName\\My Documents\\R
Projects\\Project1\\file.name.csv"
What I want is "file.name.csv"
Currently I use the
2006 Jul 09
4
string problems with "\\" (Windows)
Greetings, R-ians:
I'm using R 2.3.1 on WindowsXP.
I need to find the name of a file at the end of a sting that contains the
path + file, with the problematic "\\" as separators.
The string looks something like this:
"C:\\Documents and Settings\\myName\\My Documents\\R
Projects\\Project1\\file.name.csv"
What I want is "file.name.csv"
Currently I use the
2006 Mar 05
2
plotting partial deriviatives
Dear R Helpers:
I am trying to annotate a plot. The following code snippet works, but it is
kind of a kludge since it adds the partial derivative symbols after creating
the plotmath frac(). Is there a more elegant way to write a partial
derivative?
dev.off()
plot(NA, xlim=c(-3,3), ylim=c(0,1.6), xlab="", ylab="", tck=-0.015)
text(1.6, 1, expression(paste("slope =
2009 Aug 26
1
Scripting - sort of
Dear R-ians:
I'm running R2.9.2 on a 6 year old Windows XP DELL with 2 Gig RAM and a 3MHz
Pentium 4 chip.
I've written a package using the User Menus Under Windows commands
(winMenuAdd, etc). It works very well.
I have 6 test cases and running any one of them requires many selections
form the menus and some keyboard entry, and it takes me hours to exercise
them all to see
2006 Aug 19
4
string-to-number
Greetings, Amigos:
I have been trying without success to convert a character string,
> repeated.measures.columns
[1] "3,6,10"
into c(3,6,10) for subsequent use.
as.numeric(repeated.measures.columns) doesn't work (likely because of the
commas)
[1] NA
Warning message:
NAs introduced by coercion
I've tried many things including
strsplit(repeated.measures.columns, split =
2008 Apr 03
1
help with R semantics
Greetings:
I'm running R2.6.2 on a WinXP DELL box with 2 gig RAM.
I have created a new glm link function to be used with family = binomial.
The function works (although any suggested improvements would be welcome),
logit.FC <- function(POD.floor = 0, POD.ceiling =1)
{ if (POD.floor < 0 | POD.floor > 1) stop ("POD.floor must be between zero
and one.")
if
2009 May 03
2
clear screen?
I?ve been using this routine for several years. I?m sorry, I don?t remember
where I got it. It works as it should, viz. it blanks the R console. But
it requires package rcom and now that requires rscproxy.
cls <-
function ()
{
require(rcom)
wsh <- comCreateObject("Wscript.Shell")
comInvoke(wsh, "SendKeys", "\f")
invisible(wsh)
}
> cls()
2006 Apr 21
4
programming advice?
Dear R-helpers:
I am doing some exploratory programming and am considering a routine that
has several other routines defined within it, so that I can avoid a large
and messy global re-programming to avoid naming conflicts.
My question is this: Because it is interpreted, does R have to re-build
these internal routines every time the new routine is called? I'm not
overly worried right now
2009 May 02
1
compiled help pages
Greetings:
This should be easy but it isn't.
I have a home-brew package that works fine, with compiled html help pages,
all 150 of them. I want to make a similar package but not from scratch
since only a half-dozen routines are changed. So I created a new directory,
copied the old package into it and changed the name to newSTUFF. I changed
the names of all help pages too, as weill
2006 Oct 20
3
R-2.4.0 and MS Vista OS - installing packages
I have installed Microsoft Vista Release Candidate 1, and R-2.4.0, on a 4
year old DELL box with a 2.26 GHz P4 and 1 gig. It was a clean install ? R
is the only non-MS program running.
I cannot install packages from CRAN, nor from local zipped files. (I have
R-2.4.0 installed on a Windows XP machine and have had no problems so the
difficulty seems to be Vista not R, however they aren't
2006 Oct 20
3
R-2.4.0 and MS Vista OS - installing packages
I have installed Microsoft Vista Release Candidate 1, and R-2.4.0, on a 4
year old DELL box with a 2.26 GHz P4 and 1 gig. It was a clean install ? R
is the only non-MS program running.
I cannot install packages from CRAN, nor from local zipped files. (I have
R-2.4.0 installed on a Windows XP machine and have had no problems so the
difficulty seems to be Vista not R, however they aren't
2004 May 02
2
building a "simple" R package
Dear R-ers:
Recognizing that it is better to remain silent and have people think you
stupid than to speak and remove any doubt, I fear that I must speak
nonetheless.
I am having the Devil's own time trying to make a simple R package for my
own use. Yes, I have perused the FAQs and searched the archives. Yes, I
have read "Writing R Extensions" and eventually divined what Rcmd
2006 Aug 28
3
screen resolution effects on graphics
Greetings, R-Citizens:
I have the good fortune of working with a 19" 1280 X 1024 pixel monitor. My
R-code produces nice-looking graphics on this machine but the same code
results in crowded plots on an older machine with 800 X 600 resolution. In
hindsight this seems obvious, but I didn't anticipate it.
My code will be used on machines with varying graphics (and memory)
capacity. Is
2007 Dec 27
2
Running R from a CD on Windows?
Greetings, R-ians:
Yes it's easy to run R from a CD: I copied my windows installation folder to
the CD, then copied my R working directory to the CD.
To run from the CD, I copy the working directory from the CD to the desktop,
and then create an R desktop icon that points to Rgui.exe on the CD, and
starts in the working directory folder I just copied to the desktop.
The problem is that to
2008 May 28
5
"rbinom" not using probability of success right
I am trying to simulate a series of ones and zeros (1 or 0) and I am using "rbinom" but realizing that the number of successes expected is not accurate. Any advice out there.
This is the example:
N<-500
status<-rbinom(N, 1, prob = 0.15)
count<-sum(status)
15 percent of 500 should be 75 but what I obtain from the "count" variable is 77 that gives the probability of