I would like to create a simple polygon using the sf
package.
From my understanding, I have to create a two column matrix where the last row is identical to the first one to close the ring of the polygon.
p1 <- structure(c(0.424084334649542, 0.316800956453136, 0.394125036134903,
0.424084334649542, 0.646053530054886, 0.608338100572382, 0.851623048730609,
0.646053530054886), .Dim = c(4L, 2L))
The matrix p1
has the form that I want
[,1] [,2]
[1,] 0.4240843 0.6460535
[2,] 0.3168010 0.6083381
[3,] 0.3941250 0.8516230
[4,] 0.4240843 0.6460535
If I try to create a polygon with this data I got this error
st_polygon(p1)
Error in MtrxSet(x, dim, type = "POLYGON", needClosed = TRUE) :
is.list(x) is not TRUE
However for linestrings it works
st_linestring(p1)
LINESTRING (0.4240843 0.6460535, 0.316801 0.6083381, 0.394125 0.851623, 0.4240843 0.6460535)
Anyone knows why?
Thanks for the help.