search for: charilaos

Displaying 20 results from an estimated 35 matches for "charilaos".

2007 Jan 14
4
Controlling size of boxplot when it is added in a plot
...ee them next to each other, to develop a feeling for what histograms might correspond to what boxplots. Is there perhaps some reason why I should avoid showing those graphs to them like that, that I am not aware of? Or just a reason why I haven't seen them combined like this much? TIA Charilaos Skiadas Department of Mathematics Hanover College P.O.Box 108 Hanover, IN 47243
2007 Nov 07
3
Indexing, and using an empty string as a name
Hello all, I ran into the following, to me unexpected, behavior. I have (for reasons that don't necessarily pertain to the question at hand, hence I won't go into them) the need/desire to use an empty string for the name of a vector entry. Perhaps I did not read ?"[" very carefully, but it seems to me that he following lines should return "1" at the end:
2007 Feb 04
4
Reading expressions from character vectors
Greetings, I have a problem that I am sure is very straightforward, but I just can't wrap my head around it. I've read the help pages on text, plotmath, expression, substitute, but somehow I can't find the answer to this simple question. Basically consider the following example: plot( NULL, xlim = c(0,2), ylim = c(0,2) ) expressions <- expression( -infinity, infinity )
2006 Nov 08
6
Making a case for using R in Academia
...ing used outside of academia, or in general any other resources that talk about R as a practical alternative to the other non-free statistical packages. Perhaps some statistics, or particular examples of use? Any links would be greatly appreciated. Thanks for any thoughts/input into this. Charilaos Skiadas Department of Mathematics Hanover College P.O.Box 108 Hanover, IN 47243
2008 Jan 22
1
R: determinants and inverses
hello all sorry for the following "none" R related question. does anyone know of a reference to calculate the following identity: |I + ABC| where I is an identity matrix and A, B,C may not have to be square matrices? you help will be greatly appreciated. H. V. Henderson; S. R. Searle SIAM Review, Vol. 23, No. 1. (Jan., 1981), pp. 53-60. provides a result to
2007 Dec 17
3
Cannot grasp how to apply "by" here...
I have a data frame named "database" with panel data, a little piece of which looks like this: Symbol Name Trial Factor1 Factor2 External 1 548140 A 1 -3.87 -0.32 0.01 2 547400 B 1 12.11 -0.68 0.40 3 547173 C 1
2008 Jun 12
2
numbers as part of long character
Hi, I'm looking for some way to pick up the numbers which are contained and buried in a long character. For example, outtree.new="(((B:1204.25,E:1204.25):7581.11,F:8785.36):8353.85,C:17139.21);" num.char =
2008 May 02
1
Phil Spector's book
...compelled to advertise it. Didn't see any previous postings about > it. Hope no offence taken! > > Best wishes, and well done with book. Looking forward to receiving > it... > > Mark > > 2008/5/2 Deepayan Sarkar <deepayan.sarkar at gmail.com>: >> On 4/30/08, Charilaos Skiadas <cskiadas at gmail.com> wrote: >> >>> Actually it's been out for a couple of weeks now at least. >> >> Yes, it's been out since March 12, actually. >> >> >>> I just finished >>> my first reading of it, and I must say it...
2007 Mar 01
2
R code for "Statistical Models in S" ?
I just acquired a copy of "Statistical Models in S", I guess most commonly known as the "white book", and realized to my dismay that most of the code is not directly executable in R, and I was wondering if there was a source discussing the things that are different and what the new ways of calling things are. For instance, the first obstacle was the solder.balance data
2008 Mar 05
4
vertex labels in igraph from adjacency matrix
I am getting some unexpected results from some functions of igraph and it is possible that I am misinterpreting the vertex numbers. Eg., the max betweenness measure seems to be from a vertex that is not connected to a single other vertex. Below if my code snippet: require(igraph) my.graph <- graph.adjacency(adjmatrix = my.adj.matrix, mode=c("undirected")) most.between.vert <-
2007 Dec 22
2
Understanding eval
After many hours of debugging code, I came to the conclusion that I have a fundamental misunderstanding regarding eval, and hope that someone here can explain to me, why the following code acts as it does: foo <- function(expr) { eval(substitute(expr), envir=list(a=5), enclos=parent.frame()) } bar <- function(er) { foo(er) } > foo(a) [1] 5 > bar(a) Error in eval(expr,
2008 Feb 29
8
Running LaTeX dvi previewer on MacOS X
Several people have given great advice on how to successfully use X11 on Mac to so we can use the dvi previewer to view latex() output from Hmisc. Now after a version upgrade of X11 and X11sdk we are getting lots of crashes. I noticed a Mac dvi previewer with an executable stored as /Applications/TeX/TeXShop.app/Contents/MacOS/TeXShop Can we bypass X11 problems and point Hmisc to this
2007 Feb 15
1
Proper way to typeset the symbol for R in LaTeX?
Hoping this is not off topic... I am in the process of writing some tutorials for my students for learning R, and naturally I'm using Sweave for this. So suddenly a question occurred to me: LaTeX has a recommended way of typesetting the TeX and LaTeX symbols, via the \TeX and \LaTeX commands. Is there a similar command for the R symbol, or in general are there any
2007 Mar 01
4
question about xtable and Hmisc
I would like to get rid of the row numbers using xtable and latex. The commands d = cbind(1:10,rep(1:2,5)) ans = xtable(d) latex(ans) gives output containing \begin{tabular}{rrr} \hline & 1 & 2 \\ \hline 1 & 1.00 & 1.00 \\ 2 & 2.00 & 2.00 \\ 3 & 3.00 & 1.00 \\ 4 & 4.00 & 2.00 \\ 5 & 5.00 & 1.00 \\ 6 & 6.00 &
2008 Apr 30
2
Lattice book
Dear all, I haven't seen this mentioned and presumably Dr. Deepayan Sarkar is too polite to advertise! I just received a flyer from Springer: A new book on Lattice released today!! http://www.springer.com/statistics/computational/book/978-0-387-75968-5?cm_mmc=NBA-_-Apr-08_UK_1753460-_-product-_-978-0-387-75968-5
2008 Jun 07
2
Using lm with a matrix?
I'm trying to do a linear regression between the columns of matrices. In example below I want to regress column 1 of matrix xdat with column1 of ydat and do a separate regression between the column 2s of each matrix. But the output I get seems to give correct slopes but incorrect intercepts and another set of slopes with value NA. How do I do this correctly? I'm after the slope and
2007 Feb 22
1
Cross-tabulations next to each other
I have the following relatively simple problem. Say we have three factors, and we want to create a cross-tabulation against each of the other two: x <- factor(rbinom(5, 1, 1/2)) y <- factor(rbinom(5, 1, 1/2)) z <- factor(rbinom(5, 1, 1/2)) table(x,y) table(x,z) This looks like: y x 0 1 0 2 0 1 1 2 z x 0 1 0 1 1 1 2 1 I would like to get (surely this will
2007 Nov 27
2
exporting clustering results to table
Hello list, the following approach did not work: clustersA <- pam(distances, nkA, diss=TRUE); gc(); filenameclu = paste("filenameclu", ".txt"); write.table(clustersA , file=filenameclu,sep=","); although it worked with clustersA <- hclust(distances, method="ward"); and a consecutive kclassA <- cutree(clustersA, k=nkA); filename =
2008 Feb 05
2
How to search for packages - wrap up!
Hi everybody, I have to recognize that my post certainly shows my lack of skills in really navigating the R web page .... i am surprised that only one or two persons wrote me about the "Task Views" - it is what i was after - although maybe too general for my lazy taste - but hei - it is there and certainly makes my life easier. So - Thank you John and Gabor and Roger for pointing this
2007 Mar 02
3
from function to its name?
Hi, I can get from a string to a function with this name: >f1 <- function(x){ mean(x) } >do.call("f1",list{1:4}) >get("f1") etc... But how do I get from a function to its name? >funcVec <- c(f1,median) >funcVec [[1]] function(x){ mean(x) } > str(funcVec) List of 2 $ :function (x) ..- attr(*, "source")= chr "function(x){ mean(x)