Displaying 16 results from an estimated 16 matches for "geobotan".
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geobotany
2001 Mar 22
2
newbie questions: accessing functions globally
How can I access a function created in one data directory in another? I
have been sourcing the text file that contains the function each time I go
to another data dir. This is cumbersome, and I suspect there is a way to
make functions global.
Thanks in advance,
S. David White
Dept of Speech and Hearing Science
Ohio State University
Columbus, Ohio
2001 Mar 21
5
generate random number
Hi,
I want to pick 3 "integer" random numbers from 1 to
10. How to do this?
Thanks,
Yu-Ling Wu
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2001 Feb 22
4
Setting elements in data frame
Hi all,
I have a problem which I am biting my teeth into unsuccessfully:
(x <- data.frame(S1=c("a","b","d","F"),N1=c(2,4,6,9),N2=c(6,NA,0,6)))
S1 N1 N2
1 a 2 6
2 b 4 NA
3 d 6 0
4 F 9 6
> is.na(x)
S1 N1 N2
1 FALSE FALSE FALSE
2 FALSE FALSE TRUE
3 FALSE FALSE FALSE
4 FALSE FALSE FALSE
No I want to be able to do:
1) Setting
2001 Apr 10
5
Similarity matrix
I frequently use hclust on a similarity matrix. In R only a
distance matrix is allowed. Is there a simple reliable
transformation of a similarity matrix that will result
in a distance matrix making hclust work the same as
S-Plus with a similarity matrix? Venables & Ripley 3rd
edition implies that a simple reversal of values
will suffice. Thanks -Frank
--
Frank E Harrell Jr
2001 Feb 12
2
CensorReg
Hi Group,
I wonder if R has the function CensorReg which takes
care of left truncation. I know it's in S. Thank you
so much!
Kel
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r-help
2001 Feb 20
1
interrupted plots
Hello,
I'm trying to plot simple data containing numbers/year.
I use plot(numbers~year, type="l"), but the problem is that there is no data
for several years. S I would like the line to be interrupted for the period
without data, and then continue afterwards. How can I do this ?
Also, I've been using par(new=TRUE) to put two curves (same years, different
numbers) on the same
2001 Apr 04
1
anova table
I am taking a stats class and need to do a single factor anova table
with four treatments for an assignment. The instructor showed the
class how to do it with minitab, and I am unsure how to proceede in
R.
Here is the data:
I. .8 .2 1.4 .9 .9 1.0 1.0 1.1 1.4 1.2 1.0
II. 1.6 1.1 .2 1.3 1.5 .7 .5 1.3 1.3 .4
III 1.8 .3 1.1 2.0 2.8 1.5 1.3 2.9 1.7 .8
IV. 2.4 2.6 2.82.9 1.7 2.6 2.7 2.1
2001 Aug 28
2
Estimating Weibull Distribution Parameters - very basic question
...parameters for some data points
that are assumed to be Weibull-distributed?
I guess I'm just too lazy to set up a Maximum-Likelihood estimation...
...but maybe there is a simpler way?
Thanks for any hint (and yes, I've read help(Weibull) ;)
Kaspar Pflugshaupt
--
Kaspar Pflugshaupt
Geobotanical Institute
ETH Zurich, Switzerland
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2001 Mar 16
2
apply()
Hi,
I input this command on a data matrix:
> apply( traffic, 2, function(z){z-mean(z)})
and got the following error messages:
Error in sum(..., na.rm = na.rm) : invalid "mode" of argument
Can anyone tell me what is wrong here?
Running R1.2.2 on Windows ME.
Cheers,
Kevin
-------------------------------------------------
Ko-Kang Kevin Wang
Statistical Analysis Division
2001 Mar 16
2
python bindings for R
Hello,
my group is investigating the development of a statistical program in
support of some other work we are doing. Stats is not really our area of
expertise and we would like to leverage existing code where possible. From
your site, I have gathered that R is pretty capable and well used. We are
currently developing in python and targetting a primarily windows
environment. We would like to
2001 Mar 16
2
Clip contour or image
Hi,
I am almost new to R. Would any one show me (please include an example)
how to clip a contour or image figure so that I only see the image or
lines inside a selected area?
Thank you very much
Han
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2001 Mar 15
3
outer
Dear r-plus users,
i would like to use outer in the following case outer(x,y,FUN="fun")
i suppose that my function fun is of the following form:
fun<-function(x,y)
{
if(y>x) return(x+y)
if(y<=x) return(0)
}
My problem is that the command outer(x,y,FUN="fun") return me a
null matrix instead of an upper triangular matrix.
Is somebody have a solution ?
Thanks for your
2001 Mar 20
3
finding dedicated indexes?
Hi,
I've got a matrix of two columns, say:
> d <- t(array(1:20,dim=c(2,10)))
> d
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
[4,] 7 8
[5,] 9 10
[6,] 11 12
[7,] 13 14
[8,] 15 16
[9,] 17 18
[10,] 19 20
now I need those values from column #2 where column #1 is equal to
certain values. eg.:
> i <- c(13,5,19)
The
2001 Feb 08
2
Test for multiple contrasts?
...already done
that, or are there good reasons not to use it?
BTW, I tried to extract the SEs of the contrasts by se.contrast(), but it
would not work for survival models. Would they be the same that appear in the
summary above?
Thanks for any hints
Kaspar Pflugshaupt
--
Kaspar Pflugshaupt
Geobotanical Institute
ETH Zurich, Switzerland
http://www.geobot.umnw.ethz.ch
mailto:pflugshaupt at geobot.umnw.ethz.ch
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Send "info", "he...
2001 Jul 26
6
replacing values in a vector
Hi all,
there is a vector v with several NAs. I want to create a new vector n of
the same length as v and the same NAs as in v and tried this:
n <- vector(length=length(v), mode="numeric")
replace(n, which(is.na(v)), NA)
but this does't work, all values in n are 0. What went wrong?
Thanks, Sven
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2001 Apr 20
5
Interacting with R
Dear R folks,
(Running Windows 98, Pentium II, 128 Mb RAM)
I have been using Splus 2000 for about 1.5 years, and have recently begun using R. I love the Open Source philosophy! I may be switching to to Linux soon.
My question:
How do people most often interact with R?
In Splus 2000, I used "Script" windows to write functions. "Script" windows were great because:
1..