similar to: how does R represent numbers?

Hi, this is probably a very trivial question but I can't figure out the right terms to find the solution in the list archive. I have a matrix or a data.frame or the like: > m <- matrix(ncol=3,seq(1,9)) > m [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 and now I wonder if one can provide somehow two vectors, one containing row numbers, the other

Hi, I am using 32-bit R v 2.15.1, on Mac OsX v 10.6.8 with R GUI 1.52 Leopard build 32-bit (6188). I have also replicated this error on R 2.13.2 on a windows 7 machine. In some sequences of numbers, I am unable to use the which() function to index certain values. It seems to be primarily numbers with a 3 in the decimal. For example: > S=seq(0,4,0.01) > which(S==2.02) [1] 203 >

Hello everybody. I am trying to reproduce a particular matrix in an elegant way. If I have jj1 <- structure(c(1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2, 3,1,2,3,1,2,3,1,2,3,2,3,1,2,3,1,2,3,1,2,3, 1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,3,1,2,3,1, 2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1, 2),.Dim = as.integer(c(9,9))) [ image(jj1) is good here ] then I can get this with

Hi (If you're wondering, this is a Project Euler question :)) If I wanted to calculate the sum of the digits in the decimal representation of 2^1000, what would be a good way to go about that? I've tried the following methods: # Calculate the sum of digits in the decimal representation of 2^n # Only works for smaller values of n bsum <- function(n) { s <- 0 e <-

I am trying to figure out R data types and/or storage mode. For example: > #From a clean workspace > gc() used (Mb) gc trigger (Mb) Ncells 415227 11.1 597831 16 Vcells 103533 0.8 786432 6 > x <- seq(0,100000,1) > is.integer(x) [1] FALSE > is.double(x) [1] TRUE > object.size(x) [1] 800036 > gc() used (Mb) gc trigger (Mb) Ncells 415247

as.integer() truncates doubles toward zero, as Splus does (at least v. 6.1 under Windows does). Thus: > look <- (10 * seq(14)) - 76 > 10 * (73.1 + look) [1] 71 171 271 371 491 586 681 791 886 981 1101 1201 1301 1401 > as.integer(10 * (73.1 + look)) [1] 70 170 270 370 490 586 681 791 886 981 1101 1201 1301 1401 ... It is not documented in R! I propose appending

In 2.8.1/Windows: According to ? : Details: For numeric arguments 'from:to' is equivalent to 'seq(from, to)' ... Value: For numeric arguments, a numeric vector. This will be of type 'integer' if 'from' and 'to' are both integers and representable in the integer type, otherwise of type 'numeric'.... The first claim

Full_Name: Bill Simpson Version: 65.1 OS: linux Submission from: (NULL) (193.62.250.209) Try this code as separate lines entered interactively, then try doit() doit<-function() { x<-seq(1,10) y1<-x+rnorm(10,1,1.5) y2<-x+rnorm(10,1,1) t.test(x,y1,paired=TRUE) t.test(x,y2,paired=TRUE) } doit() apparently executes only the last of a series of t.test()s. Maybe this is no bug,

Dear R-devel, A colleague was recently surprised by the behavior of the ":" operator (as sequence generator), so I decided to dig a little bit. Here are a couple of things I found. - ?":" seems a bit imprecise. The Details section says: `The operator : and the seq(from, to) form generate the sequence from, from+1, ..., to.' but `to' is not necessarily included in

Hello guys, I am working on a matrix which looks like this one: > initialMatrix <- > rbind(cbind(rep("A",3),seq(1,3)),cbind(rep("B",4),seq(1,4)),cbind(rep("C",3),seq(1,3))) > initialMatrix [,1] [,2] [1,] "A" "1" [2,] "A" "2" [3,] "A" "3" [4,] "B" "1" [5,]

Full_Name: Rico Ihle Version: 2.6.1 OS: Windows XP Professional Version 2002 Pentium(R) 4 CPU 3.2 GHz Submission from: (NULL) (134.76.183.24) # Bug in seq() function: x <- seq(-2,2,by=0.01) which(x==0.05)# How that?? # although: x# 0.05 seems to be at position 206 of x!!: x[206] # Why is this not equal to 0.05? # Reason: x2 <- as.character(x);x2 x2[206]# Ooooh... It's really not equal

Dear R users, I guess, I have a quit simple problem, but I'm not getting the solution. I create a matrix like this: test <- matrix(seq(1,3,1),ncol=5,nrow=3) then I want to create one vector, consisting of every row of the matrix. My first idea was to do this with a for loop. op <- vector() for (o in 1:3){ op[o] <- as.vector(test.id[o,]) } The results should be like this: [1]

I have a script that goes wrong because I assumed that seq.int would return integers. Below please see it does not unless user is super cautious about inserting "L" with inputs. I think seq.int should do coercion for me before returning the sequence. > xx <- seq.int(1,10) > class(xx) [1] "integer" > is.integer(xx) [1] TRUE > xx <- seq.int(1,10, 2) >

I want to make a picture of a cos wave grating (pattern of fuzzy stripes). First I try to make a plot of a cos wave: x<-seq(1:100) y<- 10*cos(2*pi*x*3/length(x)+0)+300 plot(x,y) That works fine. 3 cycles of cos wave. Now try for grating. time<-seq(1:100) f<-function(x,time) 10*cos(2*pi*x*3/length(x)+0)+300 z<-outer(x,time,f) image(x,time,z) I get a vertical grating as expected, BUT

Hi R-List, I have a question regarding R-language formats, I think. I am producing a series of graphs (using plot, barplot, barchart, and bwplot, using either text or mtext to place values on the graphs) and tables for a Francophone country. In fact, I have already done so. However, while they are pleased with the results they've requested I convert all of my decimal points into the French

Full_Name: Vlad Stolin Version: R 2.0.0 OS: Windows 2000 Submission from: (NULL) (204.128.232.211) When generating the sequence using seq() function with non-integer numbers result is somewhat unpredictable. Example: > v1<-seq(1.60,1.90,.05) > v2<-c(1.60,1.65,1.70,1.75,1.80,1.85,1.90) > v1-v2 [1] 0.000000e+00 2.220446e-16 2.220446e-16 0.000000e+00 0.000000e+00 0.000000e+00

Hi everybody, here's my problem: i call a C function which calculates a large number of double values and puts them into an array which is passed from R as a parameter in the function (like .C("function", other parameters, result = as.double( c ( 1 : quantity ) ). When the values come back to R in the result array, they are all truncated to their integer value (i.e. I lose the

# Hi there, # I am trying to apply a function over a moving-window for a large number of multivariate time-series that are grouped in a nested set of factors. I have spent a few days searching for solutions with no luck, so any suggestions are much appreciated. # The data I have are for the abundance dynamics of multiple species observed in multiple fixed plots at multiple sites. (I total I

On 25/08/2018 4:49 PM, Herv? Pag?s wrote: > The choice of the L suffix in R to mean "R integer type", which > is mapped to the "int" type at the C level, and NOT to the "long int" > type, is really unfortunate as it seems to be misleading and confusing > a lot of people. Can you provide any evidence of that (e.g. a link to a message from one of these

Hello. I recently came across the extremely strange problem (see below) of R telling me that elements of a list do not exist... I have tried running this small script on 2 computers (Mac OSX 10.7 & Windows 7) running the latest releases or R (2.13.2 on Mac, 2.14.0 on Win). I have tried it both in the standard R console, and in RStudio (v. 0.94.110), and all have the same problem. Any