Displaying 20 results from an estimated 5000 matches similar to: "MASS Library"
2002 Apr 15
1
Re: Writting R Function
Hi,
I think I found the problem. It lies in my Fortran program. Is there a
way, after a DO loop, to make sure it does NOT return anything?
Cheers,
Kevin
On Mon, 15 Apr 2002, Ko-Kang Kevin Wang wrote:
> Date: Mon, 15 Apr 2002 17:27:20 +1200 (NZST)
> From: Ko-Kang Kevin Wang <kwan022 at stat1.stat.auckland.ac.nz>
> To: R Help <r-help at stat.math.ethz.ch>
> Subject:
2002 Mar 19
0
MASS Book Exercise
Hi,
In the third edition of the MASS book, Chapter 8, Page 252 ~ 253.
I tried applying the same technique on using a negative exponential model
(as suggested in Exercise 1), and trying to get a confidence interval.
What I have changed is follows:
expn <- function(b0, b1, th, x) {
temp <- exp(-x/th)
model.func <- b0 + b1 * temp
# Differentiate temp
derive.negexp <- (x
2002 Feb 04
1
row.names in read.table()
Hi,
I was trying to read in the following data set by using:
gas <- read.table("gas.tab", header = T)
when I got the error message:
Error in "row.names<-.data.frame"(*tmp*, value = row.names) :
duplicate row.names are not allowed
Any help are appreciated.
Thanks,
Ko-Kang Wang
2002 Mar 20
4
A Very Trivial Question
Hi,
This is a very trivial question, and I do not know why I cannot remember
the answer at all!
How does one get the entire system information (which OS, R
version....etc) using an R command?
Thanks,
Kevin
------------------------------------------------------------------------------
Ko-Kang Kevin Wang
Postgraduate PGDipSci Student
Department of Statistics
University of Auckland
New Zealand
2002 May 06
4
Subtitle?
Hi,
Is it possible to add a subtitle that appears directly below the main
title?
I tried the "sub" parameter, but it adds sub-title to the bottom of the
plot.
Cheers,
Kevin
------------------------------------------------------------------------------
Ko-Kang Kevin Wang
Postgraduate PGDipSci Student
Department of Statistics
University of Auckland
New Zealand
Homepage:
2002 May 18
5
Length of a string
Hi,
Suppose I have created something like this in R:
foo <- "myfoo"
and I want to find out the number of character in foo (in other words, R
should return 5 since "myfoo" has 5 charactors.
How can I do it? I tried:
length(foo)
but it returned 1.
Cheers,
Kevin
------------------------------------------------------------------------------
Ko-Kang Kevin Wang
2002 Sep 23
4
Overall Title in par(mfrow)
Hi,
Say I did something like:
par(mfrow = c(1, 2))
plot(1:10)
plot(1:10)
and I'd like to have an overall title, i.e. a title that would appear,
centered, on the top of both plots, rather than the top of the last plot.
I tried:
title("FOO", outer = T)
but it doesn't appear right. Half of the FOO is outside the figure region
and can't be seen...
Is there another
2002 Mar 24
3
Data Checking
Hi,
This is a simple question with if elseif....however I am having trouble
constructing the solution for some reason.
Suppose I have a data set with 3 variables, a, b and c say. Let's say c
is the sum of a and b. So:
a b c
1 2 3
2 3 5
3 4 7
. . .
. . .
. . .
Suppose that I know there have been some data entry errors and I want to
check if ALL values in c is
2002 Sep 27
3
xtable()
Hi,
Does anyone know how to manually configure the number of digits printed
out from xtable()?
For example, I'm exporting a data frame through xtable() into a LaTeX
table, I only have two columns in the data frame so by default I only get
two decimal places. But I'd like at least 5 decimal places.
I had a look at ?xtable() but can't seem to find an example.
Cheers,
Kevin
2002 Sep 18
2
More on list to data frame (was: Re: List to Data Frame
Hi,
Now suppose I have just one list called FOO, which has 25 objects, e.g.:
[[1]]
1 2 3 4 5
[[2]]
6 7 8 9 10
.
.
.
And I want to do something like:
FRED <- data.frame(cbind(unlist(FOO[[1]]),
unlist(FOO[[2]]),
# ... for all 25 subsets
))
Is it possible to do this, without doing unlist(FOO[[i]]) 25
2004 Apr 14
4
Non-Linear Regression Problem
Dear all,
I was wondering if there is any way i could do a "Grid Search" on a
parameter space using R (as SAS 6.12 and higher can do it) to start the
Newton-Gauss Linearization least squares method when i have NO prior
information about the parameter.
W. N. Venables and B. D. Ripley (2002) "Modern Applied Statistics with S",
4 th ed., page 216-7 has a topic
2002 Sep 24
4
print(), paste()
Hi,
Suppose I have the following lines at the end of a function:
answer <- c(2, 1, 0, 4, 5) # In fact, answer will be generate in my
# function
print(answer) # Print the answer
# Now, find the best fitted n degree polynomial
print(paste("The best fit is with", which.min(answer) - 1,
"-degree polynomial"))
this will return:
2002 May 10
1
barplot()
Hi,
Is it possible to draw barplot with x-axis being shown? I looked up the
help file and I couldn't seem to find it.
For example, I tried to do
x <- 1:9
p <- log10(1 + 1/x)
barplot(p, xlab = "Digit d", ylab = "Probability",
ylim = c(0, 0.35), axes = F,
main = "Benford's Law Probability")
axis(1, 1:9)
axis(2, seq(0, 0.35, by = 0.05),
2002 Mar 29
2
order()
Hi,
In the order() help file, there is an example like:
a <- c(4, 3, 2, NA, 1)
b <- c(4, NA, 2, 7, 1)
z <- cbind(a, b)
(o <- order(a, b)); z[o, ]
How can I do something like "order a in ascending order, b in descending
order"? And say I have a third vector c, and I'd like to add this to the
previous condition "a ascending, b descending, c
2002 May 06
3
Using Object's Name in Function
Hi,
Suppose I have a function:
myfunc <- function(x, y) {
...
}
And within the function I want to print out the name of the x, y
vectors. For example, if I do:
> myfunc(foo, goo)
[1] "foo" "goo"
It shall return "foo", "goo" (with or without quotes is fine), where foo
and goo are two vectors with numbers.
I know this sounds strange, but I'd
2002 Jun 08
2
More on for() Loop...
Hi,
Say I want to do something like fitting 10 different sized trees with
rpart() function. The only modification I need to do is to set 10
different cp's, which I have in a vector called foo.
Can I do something like:
for(i in 1:10) {
rpart(y ~ ., cp = foo[i], data = mydata)
}
My problem is, I wish to save the 10 rpart objects into 10 different
names, my.rpart1 ~ my.rpart10, for
2002 Jan 24
1
Compiling R Package on Windows
I just installed the R-patched 1.4.0 and for some reason I now have
trouble compiling R packages - I could compile it a few weeks ago with R
1.4.0 released in December. This only happens if I put the --binary
option in.
For example:
Rcmd build --binary cw
returns the error:
make: Entering directory `/cygdrive/c/PROGRA~1/R/RW1040/src/gnuwin32'
make DLLNM= \
-C C:/MyRWork/cw PKG=cw
2002 Feb 11
2
Time Series ts() Objects
Hi,
Is it possible to create a ts() object, whose data is daily based BUT
measured only on working days?
In other words, suppose I have a data set with 255 observations, measured
from 29 June 1959 to 30 June 1960. How would I create such a data? I
tried something like:
ts(c(...), start(1959, 180))
but I'm not sure what to use for frequency. In other words I don't know
how to
2002 Jun 08
3
contour plot for non-linear models
Hello all,
I've tried to reproduce the contour plot that appears in the book of
Venables and Ripley, at page 255. Is a F-statistic surface and a
confidence region for the regression parameters of a non-linear model.
It uses the stormer data that are in the MASS package.
I haven't been able to reproduce the plot either in R ( version 1.5 )
and S. It makes the axes and it puts the
2002 Sep 10
9
R 1.6.0 beta
R 1.6.0 has gone into final feature freeze as of today.
As a new feature, we'll make interim beta versions available via
ftp://cran.us.r-project.org/pub/R/src/base
alias
http://cran.us.r-project.org/src/base
(filename R-1.6.0beta_*.tar.gz, where * is the creation date).
If you want to help ensure that the final 1.6.0 works satisfactorily
on *your* platform, it might be a good idea to