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 cell 925-724-7509 On 9/26/17, 2:36 AM, "R-help on behalf of Ashraf Afana via R-help" <r-help-boun...@r-project.org on behalf of r-help@r-project.org> wrote: 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. My data structure is a list of 141 matrices.Each matrix represents coordinates of the river lines position. Ashraf, cheers On Monday, 25 September 2017, 16:56, Eric Berger <ericjber...@gmail.com> wrote: 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 ... ) { ... tt1[[i]] <- SpatialLines(tt[[i]]) } return(tt1)} HTH,Eric On Mon, Sep 25, 2017 at 3:40 PM, Ashraf Afana via R-help <r-help@r-project.org> wrote: 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){ for (i in 1:length(x)) { tt[[i]] <- x[i]; tt[[i]] = Line(tt[[i]]); tt[[i]] = Lines(list(tt[[i]] ), 'i') tt1 = SpatialLines(list(tt[[i]])) } return(tt1) } Ashraf, [[alternative HTML version deleted]] ______________________________ ________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/ listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/ posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.