Re: [R] build a SpatialLines object from a list

Have you tried following the example in ?'SpatialLines-class' You'll probably get better help from R-sig-geo And please don't send html email, it makes your email hard to read. -- Don MacQueen Lawrence Livermore National Laboratory 7000 East Ave., L-627 Livermore, CA 94550 925-423-1062 Lab ce

Re: [R] build a SpatialLines object from a list

Hi Eric, Thanks for the help.But this will not solve the problem as it will generate a list and what I need is an object of class sp using SpatialLine function from sp package.So, I need to convert each matrix to coordinates and then to a line and then to a spatial line as figured in the code.

Re: [R] build a SpatialLines object from a list

Hi Ashraf, In that case I think you may need to structure the code to first build the list and only at the end supply that to the SpatialLines function, something like test.func <- function(x) { tt <- list() for ( i in ... ) { ... tt[[i]] <- (whatever) } return(Spati

Re: [R] build a SpatialLines object from a list

Hi Ashraf, It is not obvious to me what your structures are but one problem in your function is the assignment tt1 <- SpatialLines(list(tt[[i]])). This will set tt1 to just have one item. Consider the following test.func <- function(x) { tt1 <- list() for ( i in ... ) { ...

[R] build a SpatialLines object from a list

Hi all,I'm trying to build a SpatialLines object from a list that contains 124 river segments. Each segment in the list contains the x,y coordinates. I'm using the following code to create the SpatialLines object, but it just retrieves one segment. Any suggestions? test.func = function(x){