similar to: appending an R-object to a list

Hi, I've looked at previous discussions and did not get anything. I want to be able to append to a list in a loop. Is this possible? [[alternative HTML version deleted]]

Hi I have a list : mylist <- list( a = NULL, b = 1, c = 2 ) > mylist[1] $a NULL > is.null(mylist[1]) [1] FALSE > is.null(mylist$a) [1] TRUE why? I need to use mylist[1]

Please excuse me for asking such basic questions: Here is my code > y=c(1.21,0.51,0.14,1.62,-0.8,0.72,-1.71,0.84,0.02,-0.12) > ybar=mean(y) > ll=length(y); > ybarv=rep(ybar,ll) > x=1:ll > plot(x,ybarv,pch=1) > segments(x[1],ybar,x[ll],ybar) What I get is a collection of small circles, with a segment "on top" of the circles, which is almost what I want. But I

I can define a list containing NULL elements: > myList <- list("aaa",NULL,TRUE) > names(myList) <- c("first","second","third") > myList $first [1] "aaa" $second NULL $third [1] TRUE > length(myList) [1] 3 However, if I assign NULL to any of the list element then such element is deleted from the list: > myList$second <-

I am working with Sweave and would like to print out into my latex document the result of the R command version$platform So what I first tried in my .Rnw document was \Sexpr{print(version$platform)}. However, the output from this command is the string "x86_64-apple-darwin10.8.0" (without the quotes). This contains an underscore, which is a special character in tex and so I get an error

Hi, Try > is.null(mylist[[1]]) [1] TRUE Notice the double square brackets. From: ?`[` "The most important distinction between [, [[ and $ is that the [ can select more than one element whereas the other two select a single element." On Thu, Jun 15, 2017 at 11:33 AM, ce <zadig_1 at excite.com> wrote: > Hi > > I have a list : > > mylist <- list( a = NULL, b

I find that the str function is more helpful for understanding the difference between a null list and a list containing a null list than the implicit print function call that the interpreter invokes when you enter an expression at the console. str( mylist[1] ) -- Sent from my phone. Please excuse my brevity. On June 15, 2017 8:39:47 AM PDT, Huzefa Khalil <huzefa.khalil at umich.edu>

Suppose x and y are numeric vectors of the same length. plot(x,y) #scatterplot lmObj1 <- lm(y~x) # best fit line abline(lmObj1) # good lmObj2 <- lm(x~y) #get best fit but with axes interchanged abline(lmObj2) # not what I want. I want the correct line, drawn on the same graph, but with # response and predictor variables interchanged One way to proceed would be to

Hello dear R-users, I am currently trying to fill some datasatructure (array, list, hash...) with matrices that are calculated by a function and do vary in size: mylist = list() for(i in 1:n) mylist[i] = function(...) # returns a matrix print(mylist[1]) # prints only the first element of the matrix How can I store and afterwards access the matrices that are calculated by my function?

Here is my interaction with R: > sub(x='>|t|',pattern = '|t',replacement='zz') [1] "zz>|t|" So I say to myself "Clearly the | signs need to be escaped, so let's try this" > sub(x='>|t|',pattern = '\|t',replacement='zz') [1] "zz>|t|" Warning messages: 1: '\|' is an unrecognized escape in a

I have a few hundred files of formatted data. Unfortunately most of them end with a spurious CONTROL-Z. I want to rewrite the files without the spurious character. Here's what I've come up with so far, but my code is unsafe because it assumes without justification that the last row of df contains a control character (and some NAs to fill up the record). options(warn=-1) #turn off

Can anyone help me with the following attempt to use an external editor from within R > vi(file="p286.R") Error in edit(name, file, title, editor) : unable to open file to read > edit(file="p286.R") Error in edit(name, file, title, editor) : unable to open file to read I have only recently re-started trying to learn R. (I tried before but failed.) I am working

There is quite a long piece of code defining a certain function in one of the R packages. I think the code has a bug and I want to get the code into a file so that I can take a proper look, and possibly fix it. how does one do this? (I mean getting the code into a file, not fixing the bug.) I suppose I could copy and paste, but that's a bit error prone for various reasons. I want the same

Hi r-users, I have a matrix B and a list of 3x3 matrices (mylist). I want to calculate the quantiles in the list using each of the value of B as probabilities. The codes I wrote are: B <- matrix (runif(12, 0, 1), 3, 4) mylist <- lapply(mylist, function(x) {matrix (rnorm(9), 3, 3)}) for (i in 1:length(B)) { quant <- lapply (mylist, quantile, probs=B[i]) } But quant

Hi, I'm pretty new to R. I have an object (say a list) and I I have a function that I call on various columns in that list (excuse terminology if it's wrong/ambiguous). Imagine its like this (actual values are unimportant) and called mylist: >mylist A B 1 5 2 5 3 6 4 8 5 0 I have a function: foo = function(param){ #modify list A or B values depending on

Sweave is very useful, and I'm gradually getting used to it. I've just been battling Sweave over the re-use of code chunks. As I am pretty ignorant in the byways of both Sweave and R, this took a chunk of time to sort out. Here is what I learned: If one re-uses a code chunk, then Sweave (but not Stangle) will insist that <> start in column 1. In particular, white space to its left

I would like to print the label of each code chunk, just before printing the code chunk itself. Is that possible using SweaveHooks, or by some other mechanism? Thanks David -- View this message in context: http://r.789695.n4.nabble.com/Sweave-SweaveHooks-and-printing-the-label-tp3453829p3453829.html Sent from the R help mailing list archive at Nabble.com.

Hello, I don't want to find out how to make packages unless that becomes necessary. Also, I don't want to clog up the computer memory with functions that I'm not using. (It would be great if someone in this forum would explain how memory is used when I type library(MASS) and then use only one function from MASS. Are all the many MASS functions then residing in memory, or only the one I

Hello, I'm looking for a way to get the "name" of an object when it is used within an "sapply". More precisely, with a simple example : I have a named list of objects : myList = list(a=rnorm(10),b=rnorm(10),c=rnorm(10)) I would like to create a new object from each of the components of myList using the "sapply" function, for example to get the mean of all

I use a Mac (10.4.11 Mac Os X). In my .tcshrc I define an environmental variable MY. Is it possible to find out its value from inside R? When one loads R for Mac OS X Cocoa GUI written by: Simon Urbanek Stefano M. Iacus are files like .tcshrc read by R? Can I make the value of this environmental variable available to R? Sys.getenv() produces a lot of output, with the values of many