search for: _vectors_

On Mon, Feb 14, 2011 at 3:49 PM, Peter Lawrence <peterl95124 at sbcglobal.net> wrote: > Andrew, >                your response highlights a naming problem in LLVM, > which is that  "array" and "vector" > mean the same thing in normal computer language and compiler theory > usage, so it is > inconvenient and misleading within LLVM to give one a very

I have a function like this: changedir <- function(dataframe) { dir <- dataframe$dir gc_content <- dataframe$gc_content d <- ifelse(dir == "-", gc_content <- -gc_content,gc_content <- gc_content) return(d) } The goal of this function is to be able to input a data frame like this: > lala dir gc_content 1 + 0.5 2 - 0.5 3 +

Dear R-helpers, In the following example I compute ret and returns the SAME way. In ret I use compute returns for EACH column and in returns I do it for the whole data frame. Could someone please tell me why I see a lagged result,by which I mean ret and returns are different by one lag. getSymbols("GOOG",src="yahoo") ret<-apply(GOOG,2,function(x) diff(log(x)) / lag(x,1) )

Andrew, your response highlights a naming problem in LLVM, which is that "array" and "vector" mean the same thing in normal computer language and compiler theory usage, so it is inconvenient and misleading within LLVM to give one a very specific meaning that is different from the other.... to the LLVM developers I would suggest using the term