similar to: write.table confused by rownames/colnames (PR#7941)

Full_Name: Axel Rasche Version: 2.2.0 OS: Linux Submission from: (NULL) (141.14.21.81) Dear Debuggers, This is not a serious problem. Are 0/1 vectors intended to be used as index vectors? If yes, there is a bug. If not, it leads just to some funny behaviour rather than an error message. In the appendix is some simple code to reproduce the problem. A logical vector as.logic(a) helps by indexing

The other place its discussed is in 3.4.1 of the R Language Definition: http://finzi.psych.upenn.edu/R/doc/manual/R-lang.html#Indexing-by-vectors On 12/13/05, Tony Plate <tplate at acm.org> wrote: > Yes, 0/1 (numeric) are intended to be used as index vectors -- and they > have the semantics of numeric indices, which is that 0 elements in the > index are omitted from the result.

Dear R community, Confused by some of my lab results I ask for the definition of the null hypothesis of a two-way analysis of variance in R (anova() and aov()). Starting with the following model y = a_i + b_j , i in A and j in B is the tested null hypothesis H_0: a_i = 0 for all i in A or H_0: a_m = a_n for any m and n in A? Consequently the same questions for interaction effects.

Hi! I encountered some things trying to build own packages under Windows 2000 for which i found no answer in the documentation. First. 1. I do not found the rcmd.exe in the bin directory of R_HOME. I installed R using the setup.exe 2. I updated the R intatllation with one of the zip files. (rw1041sp.zip) now i had the rcmd.exe in the bin. 3. I do not found any hint in the docu that perl is

Is there a library that is able for example to 1. merge 2 dataframes by row eg.: rbind(dataframe1, dataframe2):data.frame 2. delete a column from a dataframe del(dataframe, colname) or del(dataframe, colindex= 1):data.frame? 3. Select lines from a dataframe by a specific function ? select(dataframe, func=small(x){x<1}, colindex=3): data.frame? 4. converting all double columns of a data.frame

I have a vector with about 100.000 values representing a quite regular function (sinusoid like). I would like to find all local maxima of this function (should be about 4000). Is there a native routine for R? Thanks in advance Eryk. -- _|_ \|/ \|/ Eryk Witold Wolski tel :0049-(0)30-8413-1543 w w ?v? 'v? \'v'/ MPI Moleculare Genetik fax :0049-(0)30-8413-1139 |

>I a missing in R extension a more detailed step by step description with=20 >some examples. >To whom send proposals of change to the R extensions manual. I am also=20 >willing to writ one step by step descriptin for windows 2000. If you would like to draft a detailed section on building packages under windows, that would be great. Once you're done, please email it to me (as

Full_Name: Bert Gunter Version: 2.0.0 patched OS: Win2000 Submission from: (NULL) (192.12.78.250) The TRUE/FALSE options of the colnames argument in sqlFetch (RODBC) seem to be reversed, at least for .xls files. ## z is a connection to an xls workbook opened by odbcConnectExcel() > dat<-sqlFetch(z,'SuccessRates',colnames=FALSE) > dat[1:5,] RecID Name Run Grams Lost Run

Hello, I urgently need a histogram of the vector geo1$ds1 but: > hist(geo1$ds1) Error in hist(geo1$ds1) : unused argument(s) ( ...) I can use density, summary, boxplot and stem with this vector but not hist ? Any suggestions ? Thanks in advance, Detlef Groth > density(geo1$ds1) Call: density(x = geo1$ds1) Data: geo1$ds1 (1412 obs.); Bandwidth 'bw' = 0.2805

Hi all, How get colnames and rownames in Rcpp method? attecthed file : RGui.exe capture my work environment : R version : 2.11.1 OS : WinXP Pro sp3 Thanks and best regards. Young-Ju, Park from Korea [1][rKWLzcpt.zNp8gmPEwGJCA00] [@from=dllmain&rcpt=r%2Dhelp%40r%2Dproject%2Eorg&msgid=%3C20100728211143%2EH

Hello, I have another stupid question. I hope you can give me a hint how to solve this: I have a list and one element is again a list containing matrices, all of the same dimensions. Now, I'd like to set the dimnames for all matrices: example code: m1 <- matrix(1:25, nrow=5) m2 <- matrix(26:50, nrow=5) # ... there can be much more than two matrices l <- list() l[[1]] <-

Looking into several different parts of R../src/library/base/R/*.R has led me to the conclusion that quite a bit of code doubling could be saved by using the following two functions whose naming philosophy is derived from that of NROW() & NCOL(): COLNAMES <- function(x) if(is.null(n <- colnames(x))) paste(seq(length=NCOL(x))) else n ROWNAMES <- function(x)

Data frames are lists of columns. The names() function is appropriate for lists. It doesn't pay to fall into the trap of thinking that data frames are truly symmetric between columns and rows, because there is a performance penalty for accessing rows that is greater than the cost of accessing columns. With that in mind, thinking of data frames as lists is preferred, so names is preferred

The help text for row+colnames {base} states: "For a data frame, rownames and colnames eventually call row.names and names respectively, but the latter are preferred." Why are they "preferred"? Why is it names(), not col.names()? I have only ever used names() for vectors - I'm surprised it works on data.frames... IMO this is not great for code readability, thus

There's a bit of a symmetry issue, which may or may not be important (led to 15 seconds of confusion until I got my bearings straight): row.names, rownames; colnames, no col.names? I _NOW_ realize the difference between row.names and rownames, but is there any reason not to have col.names for re-naming columns in a data.frame? (if there is, I don't particular need to know it, but it

Dear princely R developers to whom I owe so much of my daily productivity level, I am wondering how indexing by row and column names are implemented. That is, when I have a matrix with named rows (or columns) and I then index into that matrix using the string names (rather than integers), how does R scan through the list of names in order to figure out which row/column to use? My current

Dear all, I have a data frame of dimension 720 columns by 360 rows, to which I am trying to add numerical row and column labels to, using the 'sequence' command. The original data, which I read in using 'read.table', had no such labels at all. I've got as far as successfully using the sequence command and getting the labels to display. However, I'm finding that for the

I noticed something surprising (in R 2.2.1 on WinXP) According to the documentation, rownames and colnames are character vectors. Assigning a vector of class POSIXct or POSIXlt as rownames or colnames therefore is not strictly according to the rules. In some cases, R performs a reasonable typecast, but in some other cases where the same typecast also would be possible, it does not. Assigning a

I noticed something surprising (in R 2.2.1 on WinXP) According to the documentation, rownames and colnames are character vectors. Assigning a vector of class POSIXct or POSIXlt as rownames or colnames therefore is not strictly according to the rules. In some cases, R performs a reasonable typecast, but in some other cases where the same typecast also would be possible, it does not. Assigning a

Hi, I am working on some microarray data, and have some problems with writing iterations. In essence, the problem is that objects with three dimensions don't have rownames and colnames. These colnames and rownames would otherwise still be there in 2 dimensional objects. I need to generate multiple iterations of a 2 means-clustering algorithm, and these objects thus probably need 3