db.ident {RGeostats}

R Documentation

Search for a list of variables in a Db

Description

Search for a list of variables in a Db

Usage

db.ident(db, names = NA, lower = NA, upper = NA,
         flag.one = FALSE, flag.nonull = TRUE)

Arguments

db	The db-class containing the variables
names	List of variable names. See details for more information
lower	Minimum rank of the selected variable(s) if specified
upper	Maximum rank of the selected variable(s) if specified
flag.one	If TRUE, a single variable may be selected. If more than 1 variable is designated, an error is generated.
flag.nonull	If TRUE, at least one attribute must be selected. If no attribute is finally defined, an error is generated.

Details

The argument 'names' can be provided as a list of items. Each item can be:

• a numeric value: it corresponds to the attribute rank (between 1 and the total number of attributes).

• a string: it corresponds to a string which will be searched first in the list of variable names, then in the list of locators.

If an attribute is specified more than once, it is retained only once.

Value

List of attribute numbers that have been selected.

Examples

data(Z_data.db) # Load the Documentation Points Db
Z_data.db # Print a short contents of the Db
db.ident(Z_data.db,"x*")   # Returns 2 3
db.ident(Z_data.db,"F*V*e",2) # Returns 4 (Name: "First Point Variable")
db.ident(Z_data.db,c(2:3,"z2")) # Returns 2 3 5

# Clean up
rm(Z_data.db)

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