[R] build a SpatialLines object from a list

[Eric Berger]

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 at 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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>
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