similar to: Math ops behaviour with multiple classes

I think you may be confusing (S3) class and ?mode. > x <- seq.int(1:3) > class(x) [1] "integer" > mode(x) [1] "numeric" > class(x+.5) ## coercion [1] "numeric" > mode(x+.5) [1] "numeric" But note: > y <- as.integer(1) > class(y) [1] "integer" > class(y) <- "foo" > mode(y) [1] "numeric" >

Thanks Bert, I think we agree on the current behaviour, but I'm still not sure if it's desirable. The mode isn't used for method dispatch. In the following example, I have to write `log.foo` in order for the correct method to be called. > x <- seq.int(5) > class(x) <- c("integer", "foo") > half <- function(x) UseMethod("half") >

I have a matrix of frequency counts from 0-160. x<-as.matrix(c(0,1,0,0,1,0,0,0,1,0,0,0,0,1)) I would like to apply a function creating a new column (x[,2])containing values equal to: a) log(x[m,1]) if x[m,1] > 0; and b) for all x[m,1]= 0, log(next x[m,1] > 0 / count of preceding zero values +1) for example, x[1,2] should equal log(x[2,1]/2) = log(1/2) = -0.6931472 whereas x[3,2] should

This is a very simple question but I couldn't form a site search quesry that would return a reasonable result set. Say I have a vector: x <- c(0,2,3,4,5,-1,-2) I want to replace all of the values in 'x' with the log of x. Naturally this runs into problems since some of the values are negative or zero. So how can I replace all of the positive elements of x with the log(x) and the

Hi all, Suppose I want to set the values in a column to the log of the values of another column like so: object$LogDist <- log10(object$Distance) How do I loop through the objects if I have object1, object2, etc to perform this function? object1$LogDist <- log10(object1$Distance) object2$LogDist <- log10(object2$Distance) object3$LogDist <- log10(object3$Distance) I was trying to

Am I trying to perform multiple linear regressions on each 'VARIABLE2'. I figured out that there are different ways, using the following code: (data is given at the end of this message) reg <- lapply(split(TRY, VARIABLE2), function(X){lm(X2 ~ X3, data=X)}) lapply(reg, summary) Which produces the following: $`1` Call: lm(formula = X2 ~ X3, data = X) Residuals: Min

Hi LLVMers, I would like to ask a question regarding aliasing. Suppose I have the following program: double f(double** p ) { double a,b,c; double * x = &a; double * y = &b; double * z = &c; *x = 1; *y = *x + 2; *z = *x + 3; return *x+*y+*z; } LLVM can tell that the three pointers do not alias each other so can perform the constant folding at compile time.

I had some fun this afternoon coding up a 'maze generator' in R. I thought I'd pass along the fruits of my labor for everyone's amusement. As written, every point is connected to every other point, so feel free to 'start' and 'finish' anywhere you like. Have fun! --Robert PS. Feel free to pass along suggestions or comments.

Hi Dan and Others , I'm newbie to LLVM and Clang ,But has experience on compiler optimization and VM . Everyone talking about the LLVM in my organisation so thought of peeking into it and where this discussion is stalled me ... so i tried to simulate the problem ,which is discussed here . vi sample.c double f(double** p ) { double a,b,c; double * x = &a; double * y =

Hey guys, I'm a bit of a beginner (understatement!) with shell scripting and seek help! I am setting up our new squid proxy. Its working a treat and squidGuard is the icing on the cake. But, I am trying to write a shell script to search through our black list category's for squidGuard and remove the parsed value; Scenario: /some/directory/where/blacklist/is/stored contains about 40-50

Hi Roel, the code you list below is precisely what I expect to get (of course the stores must happen but the constant folding should happen as well). It all looks very strange. LLVM is behaving as if the __restrict__ keyword was not used at all. Even more strange is the fact that for this function: double f(double *__restrict__ x, double *__restrict__ y, double *__restrict__ z) { *x = 1.0;

On Jan 24, 2012, at 8:58 PM, Brent Walker wrote: > Thank you for your reply. The compromise you describe below, is it a > compromise in the LLVM back end or in clang? I run into this while > building a compiler for a small DSL language for which I generate > functions that receive a context from which they extract a bunch of > pointers to doubles from which inputs are passed to

It's normal for me to create a list of data.frames and then use do.call('rbind', list(...)) to create a single data.frame. However, I've noticed as the size of the list grows large, it is perhaps better to do this in chunks. As an example here's a list of 20,000 similar data.frames. # create list of data.frames dat <- vector("list", 20000) for(i in

Hi Brent, Looking at your code I can see at least one reason why some of the store operations remain in the output since you are (through x, y, and z) writing in memory which exists outside of your function (p). Constant propagation also seems to work in the first few lines, *y = *x +1 (%3) is stored directly. The strange thing to me is that the same doesn't happen for *z = *x + 2. Here

Hey Listee's I am trying to write a shell script to sort and compare my blacklist for squidGuard with the nightly updates that come down in a tar ball. It should be rather simple but I'm not to grate at this. The script is to run nightly, it will download the latest blacklist tarball, un tar it and then add any new entries to the existing black list. The blacklists work by having a folder

Hi, Emilis, I have two working Icecast players which implement client-side parsing of yp.xml and searching then through it: - Python, can either transform the yp.xml into SQLite database and then search inside, or can store the yp.xml locally and transfer in into DOM, then search it. http://www.zavedil.com/software-xbmc-icecast - Java (Android), same algorithm as Python but only the SQLite

I think the problem here is that the IR doesn't have any way to attach restrict information to loads/stores/pointers. It works on arguments because they can be given the 'noalias' attribute, and then the alias analyzer must understand what that means. Pete On Jan 24, 2012, at 7:47 AM, Roel Jordans wrote: > I have no clue, I didn't have time to look into that example yet.

Has anybody got Trillian to work? If so, how? Dex -- -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCS d--(+)@ s-:+ a- C+++(++++) UL+>++++ P+>++ L+++>++++ E-- W++ N o? K- w--(---) !O M+ V- PS++(+) PE(-) Y+ PGP(-) t++(---)@ 5 X+(++) R+(++) tv--(+)@ b+(+++) DI+++ D G++ e* h>++ r%>* y? ------END GEEK CODE BLOCK------ http://www.againsttcpa.com - nothing fights like the opposition

Can you explain please why it works for this version of the function: double f(double *__restrict__ x, double *__restrict__ y, double *__restrict__ z); What is different here? There are stores here as well. Brent On Wed, Jan 25, 2012 at 12:34 AM, Roel Jordans <r.jordans at tue.nl> wrote: > Hi Brent, > > I think this is a problem in the easy-cse transform. In this transform

Hello R-World, i am trying to calculate data for a DEM (Digital Elavation Model) which i also want to plot in R. i have the coordinates for the lower left corner which look something like this: x<-42,2 y<-50,5 besides i have the cellsize of the grid, which is: z<-1,1 what i do is to calculate the corrdinates of the cells to the right and top, what i can do by specifying the number of