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I need to find solutions to a tridiagonal system. By this I mean a set of linear equations Ax = d where A is a square matrix containing elements A[i,i-1], A[i,i] and A[i,i+1] for i in 1:nrow, and zero elsewhere. R is probably not the ideal way to do this, but this is part of a larger problem that requires R. In my application it is much easier (and much faster) to generate the diagonal and

Hi all, Does anybody know whether one can nest an 'if' statement in a 'for' loop. According to the results of my code, the for loop is performed first, but I'm not sure I got something else wrong with my code. I'm trying to perform the if statement for each step of the for loop. Thanks in advance. Best regards, Sebastian

Hello, I searched the archives but could not come to a solution. I have to two columns of information t_start_cdt looks like: > t_start_cdt[1:4] [1] "2003-07-09 11:02:25" "2003-07-09 11:10:25" "2003-07-09 11:30:25" [4] "2003-07-09 12:00:25" > class(t_start_cdt) [1] "POSIXt" "POSIXlt" t_end_cdt looks like: > t_end_cdt[1:4]

Hello , just a simple question from a beginner: I write the function: plotsinx <- function() { x<-seq(0,2*pi,0.01) sinx<-sin(x) plot(sinx) } I recall it: plotsinx() and the plot works properly. but then in the workspace if I want to look at the values of sinx the following error is displayed: Error: Object "sinx" not found. How to save the variables created by the function on

Hi I'm using R 2.0 in SuSE 9.2. When I plot data as a boxplot, the boxes appear on the plot in alphabetical order (of group) rather than the order in which they appear in the data. So far, the only thing I can do to fix this is to prefix the group labels with a,b,c...etc to trick R into plotting them in the right order. Can sorting be turned off? How should I address this sensibly? Thanks