db.locate {RGeoS} | R Documentation |
Define the multiple locators for a set of variables
db.locate(db, columns, loctype=NA, start=1)
db |
Name of the DB to be updated |
columns |
List of indices of the fields to be updated. |
loctype |
Generic type of the locators. When set to NA, the locator are set to NA. |
start |
Index of the locator assigned to the variable(s). |
The variables specified in 'columns' are set to this generic locator and numbered from 'start' to 'start+n' (where 'n' designates the length of 'columns'). If the argument "loctype" is not provided, the locators of the variables are set to NA: the variables are declassified.
The db-class
where the fields are updated.
data(Example_data.db) # Load the Documentation Points Db Example_data.db # Print a short contents of the Db # The locators are "NA","x1","x2","z1","z2" # Set the locator of field 5 to the third rank of 'z' Example_data.db <- db.locate(Example_data.db,5,"z",3) Example_data.db # Set the locator of field 5 to the (defaulted) first rank of 'z' Example_data.db <- db.locate(Example_data.db,5,"z") Example_data.db # Note that the locator of field 4 is discarded # Set fields 4 and 5 back to their initial locators Example_data.db <- db.locate(Example_data.db,seq(4,5),"z") Example_data.db