search for: i'th

Hello, I have a double vector, x. I can access the i'th element as REAL(x)[i] Is there a function for this? I know i can write my own, but was seeing if one already exists. I did check Rinternals.h but didn't see one. Cheers Saptarshi

In multi-x-screen ZaphodHeads configurations, there isn't a one-to-one mapping of kernel provided drmmode crtc index to the index of the corresponding xf86Crtc inside the xf86CrtcConfig crtc array anymore, ie. for kernel provided drmmode->mode_res->crtcs[i], the i'th crtc won't corr...

Hi, I have 3 lists, x, y, z and I'd like to perform a calculation over all the lists simultaneously. If it were a single list I could use lapply, but for more than one list I'm using a for loop. Is there an idiom that would let me use something like lapply, but the function specified to lappy...

> From: Thomas Lumley >> >> On Tue, 14 Mar 2006, John McHenry wrote: >> >> > Thanks, Gabor & Thomas. >> > >> > Apologies, but I used an example that obfuscated the question that I >> > wanted to ask. >> > >> > I really wanted to know how to have extra arguments in >> functions that >> > would allow, per the example code, for something like a >> counter to be >&g...

http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-set-components-of-a-list-to-NULL_003f The explanation on this FAQ entry is not clear. It says '... similarly for named components...'. What I understood was x[i]<-list(NULL) is the same as x$a_name<-list(NULL). But, they are not. As the example below shows, x$a_name<-list(NULL) is...

I don't understand this patch (what are all these masks? how are they used?), and don't want to invest the time required to do so. However Mario is probably the sole serious user of ZaphodHeads, and if it fixes issues for him, probably fixes issues for others who try and give up with ZaphodH...

I'm hoping that someone could guide me in how to extract data from shapefiles. I want to extract data from a shapefile (classed as "SpatialPolygonsDataFrame") and more specifically, the data is contained within the slot called "coords" from the class "polygons" with...

Hello, I'm a beginner with R and it's the first time I'm using the R-help list... I hope I'm in the right place, if not: Sorry!! I need to do non linear regressions on a data set which columns are: "river.name" "Portata" "PTG.P" "PO4.P" &quot...

I need to refresh my memory on Probability Theory, especially on conditional probability. In particular, I want to solve the following two problems. Can somebody point me some good books on Probability Theory? Thank you! 1. Z=X+Y, where X and Y are independent random variables and their distribution...

r-devel list, I have recently written an R package that solves a linear least squares problem, and computes the multivariate normal density function. The bulk of the code is written in C, with interfacing code to the BLAS and Lapack libraries. The motivation here is speed. I ran into a problem computing the...

Hello, I would like to use the cbind() function to construct a matrix used in the middle of a function as following for (i in 1:1000) { b[i] <- function(cbind(a[[1]][[i]], a[[2]][[i]],a[[3]][[i]],...a[[67]][[i]])) } Is there an easy way of achieving this rather than "cbind" every column? --...

I need to get the names of the list elements when I iterate over a list. I'm wondering how to do so? alist=list(a=c(1,3),b=c(-1,3),c=c(-2,1)) sapply(alist,function(x){ #need to use the name of x for some subsequent process })

Hi Welson, > Yes, it is a ConstantExpr! Thank you! > > Now trying to find a clue in ConstantExpr's functions to get that string :-) you can get the pointer operand by doing: getOperand(0) The i'th index is getOperand(i+1). Ciao, Duncan. > > Regards, > Welson > > On...

I want to maximize a conditional likelihood function that is basically logistic conditional on the number of successes within strata. What would be a good starting place for this? A complication is that the denominator includes a term that is the sum over all permutations. Although there is no tim...

I have two data sets: "new" and "combo". Within both data set, each row pertains to a unique individual. The "combo" data set is a subset of the "new" data set, meaning that all individuals within "combo" are within "new" but not all individ...

Hello, I have been wondering of an efficient way to do this: I have an n x m x p array Z and a p x n matrix Y. I want to multiply each of the n matrices with the corresponding column vector of Y. In other words, I am wanting to matrix multiply: Z[i, ,] %*% Y[, i] which will give me a (two-dimensional)...

Hey Duncan, Thanks! I figured out this piece of code finally: Value *gep = call->getArgOperand(0); if ( ConstantExpr *pCE = dyn_cast<ConstantExpr>(gep) ) { Value *firstop = pCE->getOperand(0); if (GlobalVariable *GV = dyn_cast<GlobalVariable>(firstop...

An incremental improvement on top of listing exports. I still think it's worth experimenting with revisiting how our API for list mode should actually work [1] (so that we can reuse a single connection for both grabbing the list and finally using NBD_OPT_GO), but this change was easier to whip toge...

An upcoming commit will add the ability to query which meta contexts a server is advertising; but first we need to be able to present a different list of meta context requests in response to what we learn from the server. Add APIs for reviewing which requests have already been registered, as well as a way t...

Folks: I'd appreciate if someone could straighten me out on a few concepts which are described a bit ambiguously in the docs. 1. data.frame: ---------------- Refan p84: 'A data frame is a list of variables of the same length with unique row names, given class "data.frame".' I prob...