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,
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