similar to: R interactive = FALSE

Given: data(AirPassengers) I get a ts data structure AirPassengers in the workspace. How can I generate the code that can create that structure? That is, given an example of a data structure, is there a way to generate the code that can greate that structure? Alternatively, is there a reference that provides a list of dta structures together with a full list of theor respective attributes?

data(AirPassengers) brings AirPassengers into the workspace. How can I  idenfity what the structure of AirPassengers is? Is it a data.frame, a table etc. etc. [[alternative HTML version deleted]]

Given a<-"c(1,2,3,4,5)" How can  I evaluate the variable a to return a (numeric) vector comprising of 1,2,3,4,5? Thanks. [[alternative HTML version deleted]]

ls() gives me the vector of objects in the workspace class(objName) gives me the class of objName class(ls()) just returns character as many times as there are objects. How do I get a vector of all objects in the workspace? [[alternative HTML version deleted]]

The "R Language Definition" at http://cran.r-project.org/doc/manuals/R-lang.html states in the following section 4.3.2 Argument matching This subsection applies to closures but not to primitive functions. What are 'closures'? [[alternative HTML version deleted]]

I am looking for a means to call Win32 API calls from R for Windows. Is that possible? Thanks. [[alternative HTML version deleted]]

Given studentNumbers<-10; subjEnglish<-sample(-1:100,studentNumbers,replace=TRUE); when subEnglish <=0, 'U'                         <=39, 'F'                         <=49 'D'                         <=59, 'C'                         <=69, 'B'                         <=79,'A'                         <=100 'A+' I

If I create a data.frame using session variables as follows: classResults<-data.frame(subjEnglish,gradeEnglish,subjFrench,gradeFrench,row.names=studentName) How can I remove the variables? I tried > rm(names(classResults)) Error in rm(names(classResults)) :   ... must contain names or character strings Also, how can I include the row.names variable. I tried > names(classResults)

savehistory writes all the executed lines from the session. How can I write everything (executed lines and output) from the active session to a file? Using Edit | Select All then Edit Copy, I can copy everything to the clipboard and write the whole thing to a file manually. If I just used the clipboard, I can paste the whole content into another edittor (for documentation). Is there a way to

Given dayOfWeekName<-c("Mon","Tue","Wed","Thu","Fri","Sat","Sun"); dayOfWeekOrdinal<-c(1,2,3,4,5,6,0); dayOfWeekWorkDay<-c(TRUE,TRUE,TRUE,TRUE,TRUE,FALSE,FALSE); weekProfile<-list(dow=dayOfWeekName,dowI=dayOfWeekOrdinal,dowW=dayOfWeekWorkDay) 1. How can I conditionally get dow, dowI, and dowW from weekProfile?

This is copy & paste from my session: > xyz<-as.vector(c(ls(),as.matrix(lapply(ls(),class)))) > dim(xyz)<-c(length(xyz)/2,2) > > allobj<-function(){ + xyz<-as.vector(c(ls(),as.matrix(lapply(ls(),class)))); + dim(xyz)<-c(length(xyz)/2,2); + return(xyz) + } > xyz       [,1]              [,2]        [1,] "a"               "character"  [2,]

Given a table with colnames and rownames, print(mytable) displays the table nicely formatted. How can I capture all of what is displayed as a character matrix? Thanks. [[alternative HTML version deleted]]

I can write a plot to a files of a given format using this: x<-sample(c(1:100),10) bmp("c:/mygraph.bmp") plot(x) dev.off() and then show the image file in another application. This application can also display the image from the stream of numbers that define the image. How I can get the plot as a stream of numbers? [[alternative HTML version deleted]]

be sorted by row in ascending/descending order? Given this matrix:  57 91 31 61 16  84  3 99 85 47  21  6 57 91 31  61 16 84  3 99 I want to end with this:  21  6 57 91 31  57 91 31 61 16  61 16 84  3 99  84  3 99 85 47 The 'order' of the sort is: 3 1 4 2 Also, what R expression will give me the 'order'? Thanks. [[alternative HTML version deleted]]

Thank you Michael, Sarah and Robin for the answers to my original question. Michael you asked:"But this is rarely a good idea....perhaps you could say a little more about your overall goal and we could direct you to a more "R"-ish solution? " I realise eval (known as execute in one of my other languages) is not a good idea. The background to my question is as follows: Using

Given a variable aa in the workspace, some of its attributes are: > typeof(aa) [1] "list" > mode(aa) [1] "list" > length(aa) [1] 2 How do I retrieve the maximum indices, in this case 2,3,4? The variable itself is: > aa [[1]] [[1]][[1]] [[1]][[1]][[1]] [1] 37531.52 [[1]][[1]][[2]] [1] 62787.32 [[1]][[1]][[3]] [1] 5503.184 [[1]][[1]][[4]] [1] 33832.8

I expected the row names to be unique but a data frame appears to be able to hold duplicate row names. This makes me thing that there must be circumstances when it is necessary. However, I cannot think of any. Please enlighten me. [[alternative HTML version deleted]]

I know that [] is used for indexing. I know that [[]] is used for reference to a property of a COM object. I cannot find any explanation of what [[1]] does or, more pertinently, where it should be used. Thank you. [[alternative HTML version deleted]]

data(mtcars) mtcars[rownames(mtcars)!="Valiant",] # fails mtcars[list(rownames(mtcars))!="Valiant",] # runs but I am not getting the expected result With the latter statement, I expected all rows except the one where the name is "Valiant". I must have got something simple wrong; what is it? Thanks. [[alternative HTML version deleted]]

I've just committed a couple of changes to R-devel related to requests at userR about the Windows installer. The first of these affects all platforms, but I've only tested it on Windows: I added an option "quit.with.no.save". If TRUE, then the default q("ask") prompt will not offer to save the workspace. This is in response to the observation that new users who