similar to: confusion matrix

Hi list, Could someone explain to me why the following result is not a integer? > difftime(strptime("24NOV2004", format="%d%b%Y"), strptime("13MAY2004", >format="%d%b%Y"), units="days") Time difference of 195.0417 days I'm using R2.12.0 on WinXP. Thanks! ...Tao

Are they the same with .RData being the newer format?? Thanks, ...Tao

Hi list, I've encounter this problem (see below).? I know it's particularly R-related and it's easy to get by but it still bothers me a lot.? It looks the last character of "N.C. " is a space to me, but it's clearly not.? Can someone tell me a way to figure out what character is in the last position. Thanks! Tao > levels(dat$flag)[3] [1] "N.C.?" >

Hi list, I want to draw a bar plot with color indicating one grouping and different shading on top of the color indicating another grouping.? How should I proceed? Thanks! ...Tao

Hi list, Can somebody explain why there are these warning messages?? I just don't get it.? I'm using R 2.15.1 on WinXP. Thanks! Tao > x [1] -2.143510 -1.157450 -1.315581? 1.033562 -1.225440 -1.179909 >? ifelse(x>0, log2(x), -log2(-x)) [1] -1.099975 -0.210950 -0.395700? 0.047625 -0.293300 -0.238675 Warning messages: 1: In ifelse(x > 0, log2(x), -log2(-x)) : NaNs produced

Hi list, Is there a way to load one specific object from a .RData file which contains multiple data objects?? Thanks, ...Tao

Hi list, I have a bunch of .csv files that are password-protected. I wonder if there is a way to read them in in R without manually removing the password protection for each file? Thank you very much! ...Tao [[alternative HTML version deleted]]

Hi list, Is there a R function I can use to extract the worksheet names from an Excel file?? If no, any other automatic ways (not using R) to do this? thanks! ...Tao

Hi list, I was trying to use "predict.coxph" to calculate martingale residuals on a test data, however, as pointed out before http://tolstoy.newcastle.edu.au/R/e4/help/08/06/13508.html predict(mycox1, newdata, type="expected") is not implemented yet. Dieter suggested to use 'cph' and 'predict.Design', but from my reading so far, I'm not sure they can

Hi list, I was running Sweave on one of my .rnw file.? Everything was fine, until I came back from the vacation.? Nothing changed (at least to my knowledge), but now I have this problem: >???? Sweave("myfile.rnw") Error: ?COLO001final.rnw? is not ASCII and does not declare an encoding After snooping around on the web, I found this solution: > Sweave("myfile.rnw",

Hi list, Is there a way in "rpart" to force the variables only used once when doing the splits? This is how the question came about. Often time, the tree constructed uses the same variable (say X1) for the first and second splits, for example. However, due to practical reason, the researcher doesn't like this. The prefer to see the second split using other variables (say X2).

Hi list, Is there a function that can let me know which functions are being debugged? I know I'm probably not doing a very good job of keeping track of things, but it does get messier when you dig into different layers of a function. I know there is "isdebugged", but it only works on one function at a time. Thanks! ...Tao [[alternative HTML version deleted]]

Hi Allen and list, See the code below.? I've tried it on R2.13 and R2.8.0 using either heatmap.plus 1.3 or the latest.? All gave the same results.? The problem is in the last line: when I tried to plot two different color bars, the one corresponding to "cm.colors(10)" is not correct (it starts with one black and one red.? Not sure where they're from?) Any ideas? Thanks!

Hi list, Is there a easy way to compare objects in two different workspace files (i.e. .RData files) in R?? I can use some generic file compare softwares (e.g. BeyondCompare) to binary comparison, but when it says they're different you can't tell where the difference are from. Thanks! Tao

> -------- Original Message -------- > Subject: Re: [R] How to extract R codes that embedded in a HTML file > using Stangle? > Date: Thu, 17 May 2007 17:01:30 +0000 > From: Tao Shi <shitao at hotmail.com> > To: ligges at statistik.uni-dortmund.de, lecoutre at stat.ucl.ac.be > CC: r-help at stat.math.ethz.ch > : <jmcconnell at

Is it possible to replace the word "R Console" on the title bar (is it what it's called? It's the blue area above menu bar) with the name of the work space file you're using or loaded, so people who are runing multple R sessions at same time can identify them immediately. I'm using 1.9.0 in SDI mode. Thanks, ...Tao

Is it possible to replace the word "R Console" on the title bar (is it what it's called? It's the blue area above menu bar) with the name of the work space file you're using or loaded, so people who are runing multple R sessions at same time can identify them immediately. I'm using 1.9.0 in SDI mode. Thanks, ...Tao

Hi list, I know that points involving NAs are not plotted in 'matplot', but when I plot them as lines, I still want the lines to connect all the points (i.e. not broken where there are NAs).? Please see the example below.? How can I achieve this in 'matplot'?? If I can't, any good alternatives so I don't have to use 'plot' + 'lines' and loop through all the

Hi list, Excuse me b/c this is probably a more "TeX" then "R" question. I've been using "latex" function in my .Rnw file to generate tables, but I've always been using it without assigning the result to a object, i.e. x <- matrix(1:6, nrow=2, dimnames=list(c('a','b'),c('c','d','this that'))) latex(x) so, I

Hi List, In Windows, if I do " R CMD build mypkg", then I'll get 'mypkg_1.0.tar.gz'. Any option in R CMD build lets me to change the version, i.e. gives me 'mypkg_2.0.tar.gz"? It seems "-version" option doesn't do anything for me. Is it OK if I just change the version number in the file name manually? Thanks, ...Tao