Displaying 20 results from an estimated 10000 matches similar to: "is.constant"
2004 Mar 24
6
First Variable in lm
Hi all,
I just cannot think of how to do it:
I want to take the first variable (column) of a data frame and regress
it against all other variables.
bla <- function (dat) {
reg <- lm(whateverthefirstofthevariablenamesis ~., data=dat)
return(reg)
}
What kind of function do I have to take instead of the
whateverthefirstofthevariablenamesis,
eval(), substitute(), get(), ...
to
2004 Sep 22
1
is.constant 2
>>x <- c(1, 2, NA)
>>>>is.constant(x)
>
>>
>> [1] TRUE
>>
>> For data such as c(1, 1, 1, NA), I should think the safest answer
should be
>> NA, because one really doesn't know whether that last number is 1 or
not.
>>
>> Andy
>>
>My version is
>is.constant <- function(x) {
> if (is.numeric(x)
2002 Sep 04
3
logical and NA
Hi there, (sorry Martin, ich habe den falschen Empfaenger erwischt :-( )
Is there a function in the base package or elsewhere which returns TRUE and
not NA, even if NA is involved: (I did not find in the help system :-( )
if ( x==something & !is.na(something))
or
if ( x==something & !is.na(x==something))
If "something" is complicated, a function would be handy.
Thanks
2008 Dec 05
1
How to retrieve a method
Hi there,
I am interested in the inner workings of wilcox.test:
> wilcox.test
function (x, ...)
UseMethod("wilcox.test")
<environment: namespace:stats>
how can I get at the code, if it is R-code? For Methods one should be able to learn what extension to use, but here default or such do not help.
Is there a wayplot.default to learn which different versions of
2006 Jan 26
1
construct a bundle, subdirs do not exist?
Hi,
Sorry to bother, but I checked around and did not succed creating a
bundle from six existing packages (which are checkable, installable,
etc. individually). I carefully followed the procedure given in ch.
1.1.5 Package bundles. However, I am getting
hoffmann at fluke:~/R/Sources >R CMD check cwhmisc
* checking for working latex ... OK
* using log directory
2002 Nov 06
5
"chemical" plot
Hi all,
May be there is a plot which shows 3 variables in a triangle, their sum
being constant. I have forgotten its name, and a search in the engine using
"plot" did not help.
Does anyone know of such a procedure in R or S?
Thank you
--christian
Dr.sc.math.Christian W. Hoffmann
Mathematics and Statistical Computing
Landscape Dynamics and Spatial Development
Swiss Federal Research
2001 Feb 05
1
packages, help
Hi,
Using help under help.start() is working fine (html)
Q1:
using > ?solve results in the message
"sh: ~/R/tmp/R4f32S1cfb: cannot open"
displayed in the XEmacs buffer "help[R](solve)". BUT there exists a file
R.R4f32S167e
in that directory. (not quite the same name).
Does the "sh: " prefix suggest that the shell "sh" is run, although my
2006 Jan 11
2
Browser problem, Misrepresentation of .html in Solaris Firefox (PR#8471)
Hi there
I hope that I am in the right forum.
I am working on Win2000 PC connected via Exceed 6.0.1.0 to a
SunOS fluke 5.9 Generic_118558-11 sun4u sparc SUNW,Sun-Fire-480R
There I am using Mozilla Firefox 1.0.7 as a browser.
I am having
difficulties viewing .html files. Their first pages are displayed
normally, black on white, links in blue. When I scoll down, the pages
appear black
2001 Feb 14
2
assignment function
Hi,
I am trying to create the assignment function:
"substring<-" <- function(text, first, last=100000, sub) {
if(is.character(first)) {
if(!missing(last)) stop('wrong # arguments')
return(sedit(text, first, sub))
}
lf <- length(first)
if(length(text)==1 && lf > 1) {
if(missing(last)) last <- nchar(text)
last <- rep(last,
2006 Mar 27
3
seq(2,5,-2) not an error but NULL
Hi,
This may belong more to r-develop, but general discussion may be useful
(for the how many-th time ?)
seq(2,5,-2)
seq(5,2,2)
both result in
Error in seq.default(2, 5, -2) : wrong sign in 'by' argument
But often, if not always, mathematicians and programmers want a
behaviour e.g. in for loops, where this statement results in an empty
statement, that is
for (ii in seq(2,5,-2))
2006 Oct 12
3
Cross two dataframe
Dear r-users!
I would like to cross two data frame which have the same row number but
different in the number of column. Can anybody help me for this case ?
Thanks a lot in advance
--------------------------------------------------------------------------------
Majid Iravani
PhD Student
Swiss Federal Research Institute WSL
Research Group of Vegetation Ecology
Z?rcherstrasse 111
2004 Nov 25
1
eval in correct frame?
I am trying, without success, to find out how to formulate correctly the
parameters of "eval".
My code snippet looks like:
proutside <- function(txt) {
cat("\n",txt,"\n");
print(eval(parse(text = txt)))
}
vari <- function(Ob) {
prininside <- function(txt) {
cat("\n",txt,"\n");
print(eval(parse(text = txt)))
}
2006 Jan 27
4
regular expressions, sub
Hi,
I am trying to use sub, regexpr on expressions like
log(D) ~ log(N)+I(log(N)^2)+log(t)
being a model specification.
The aim is to produce:
"ln D ~ ln N + ln^2 N + ln t"
The variable names N, t may change, the number of terms too.
I succeded only partially, help on regular expressions is hard to
understand for me, examples on my case are rare. The help page on R-help
2001 Sep 06
4
code/documentation mismatches
Hi,
I would like to get a hint on how to debug in the case of
#> R CMD check pllib
signalling
* checking for code/documentation mismatches ... WARNING
Error in parse(file, n, text, prompt) : syntax error on line 22
I am able to sort out which of the files is the culprit is by swapping
files in and out of the /R and /man directories. But I cannot find the
syntax error, the .Rd file seems
2001 Feb 15
4
package dependence
Hi,
I want to create several packages, with package Aa depending on functions
in package A. My directories with .r and .Rd are organized as follows
./A/man/*.Rd
./A/R/*.r
./Aa/man/*.Rd
./Aa/R/*.r
Afre creatin package A with
R CMD check A
R CMD INSTALL --library=lib A
I then have
./lib/A/help etc
If I try to do
R CMD check Aa
R CMD INSTALL --library=lib Aa
I am getting
* checking
2000 May 18
1
attach (S-style)?
Hi everyone,
Being new to the crowd of R users I am wondering what the equivalent of
attach("/home/bla/hoffmann/R/.RData",2)
(S style) is in R.
What I want is a split of .RData repositories. One in a central place where I keep functions and interesting stuff important for all work I am doing, an several others which contain stuff of an dividual project only. When I start in a
2006 Oct 13
3
multiply two matrixes with the different dimension column by column
Dear all,
I would like to multiply two matrixes with the different dimension column
by column. Let make an example:
If I have two matrixes "X" and "Y"as follow:
X<- matrix(1:12, nrow=4, ncol=3, dimnames=list(c("A","B","C","D"),
c("stage1","stage2","stage3")))
Y<- matrix(1:28, nrow=4, ncol=7,
2004 Dec 03
4
vector to matrix transformation
Dear,
Some analysis (linear regression) can only be
done from a vectorized dataset whereas others
require a matrix (Mantel tests). I use the two
analyses and thus need to format my data in
matrix and vector. I spent some time trying to
solve the problem and I just gave up. Did anyone
knows how to transform a matrix into a vector and
back-transform a vector into a matrix?
Thanks by
2009 Dec 04
2
curve fitting to data
Hi to all
This is the first time I am quoting a question and I hope, my
question is not too basic...
For the following data, I wish to draw a fitted curve.
x <- c(123,129,141,144,144,145,149,150,158,159,163,174,183,187,242,248)
y <-
c(14.42,26.96,31.3,19.95,36.36,15.4,24.76,35.39,28.07,40.97,26.23,42.83,46.53,14.79,49.18,48.08)
If I plot the data, it looks somehow that a logistic
2001 Mar 01
1
Using csh
Hi all,
I am fancying the idea of using my preferred shell (t)csh when invoking
system(). How can I do that? (I didn't find anything about that in the FAQ).
Thanks for help,
-christian
Dr.sc.math.Christian W. Hoffmann
Mathematics and Statistical Computing
Landscape Modeling and Web Applications
Swiss Federal Research Institute WSL
Zuercherstrasse 111
CH-8903 Birmensdorf, Switzerland
phone: