set_col: Set columns from 'geometry' to 'data'

View source: R/spacetime-cube-set-cols.R

set_colR Documentation

Set columns from geometry to data


Set a column from the geometry context of a spacetime object to the data context.


set_col(x, .from_geo, .to_data = .from_geo)

set_wts(x, .wt_col = "wt")

set_nbs(x, .nb_col = "nb")



a spacetime object


the name of the column in the geometry context


the name of the new variable to create in the data context


the name of the weights column in the geometry context


the name of neighbor column in the geometry context


These functions will reorder the spacetime object to ensure that it is ordered correctly based on the location time columns in the geometry context defined by the loc_col and time_col attributes respectively.

set_wts() and set_nbs() create a new column in the data context with the same name as the column in the geometry context. If a different name is desired use set_col()


A spacetime object with an active data context and a new column from the geometry context.


df_fp <- system.file("extdata", "bos-ecometric.csv", package = "sfdep")
geo_fp <- system.file("extdata", "bos-ecometric.geojson", package = "sfdep")

# read in data
df <- read.csv(
  df_fp, colClasses = c("character", "character", "integer", "double", "Date")
geo <- sf::st_read(geo_fp)

# Create spacetime object called `bos`
bos <- spacetime(df, geo,
                .loc_col = ".region_id",
                .time_col = "time_period")
bos <- activate(bos, "geometry")
bos$nb <- st_contiguity(bos)
bos$wt <- st_weights(bos$nb)
bos$card <- st_cardinalties(bos$nb)

set_col(bos, "card")
set_col(bos, "card", "cardinalities")

sfdep documentation built on Jan. 11, 2023, 9:08 a.m.