R sf: Points of LinearRing do not form a closed linestring

I am trying to calculate the centroids of a set of polygons.

My dataset, geodata, contains five columns including one geometry column of class sfc_GEOMETRY, with 45759 rows.

When I run sf::st_centroid(geodata), I get the following message

Error in CPL_geos_op("centroid", x, numeric(0), integer(0), numeric(0), : Evaluation error: IllegalArgumentException: Points of LinearRing do not form a closed linestring.

In addition: Warning messages:

1: In st_centroid.sf(geodata) : st_centroid assumes attributes are constant over geometries of x

2: In st_centroid.sfc(st_geometry(x), of_largest_polygon = of_largest_polygon) : st_centroid does not give correct centroids for longitude/latitude data

• Should I run a loop to detect which geometry is not closed?
• Is this a problem with the class of my geometry? Should it be sfc_MULTIPOLYGON?

Possible solution:

I was encountering this problem when reading in a list of files through a loop. The loop would read in the files and then rbind them together into geodata, and then calculate the centroid:

for(i in 1:length(list)){
  file <- st_read(list[i])
  geodata <- rbind(geodata, file) #geodata is here a void sf object
}
geocent <- st_centroid(geodata)

When I calculated the centroids within the loop (for each file in the list), the error disappeared.

for(i in 1:length(list)){
  file <- st_read(list[i])
  file <- st_centroid(file)
  geocent <- rbind(geodata, file) #geodata is here a void sf object
}

Hence, I think the problem lay in the binding operation.

• Perhaps I had not defined my void sf object in the right manner.
• Perhaps rbind was not the appropriate function, or I should have specified its parameters.