dim-methods {PivotalR} | R Documentation |
Display the dimension of the table that a db.table
object
points to.
## S4 method for signature 'db.table' dim(x) ## S4 method for signature 'db.view' dim(x) ## S4 method for signature 'db.Rquery' dim(x)
x |
A |
A two-integer array, where the first integer is the number of rows and the second integer is the number of columns.
Author: Predictive Analytics Team at Pivotal Inc.
Maintainer: Frank McQuillan, Pivotal Inc. fmcquillan@pivotal.io
db.obj
, db.data.frame
,
db.table
, db.view
,
db.Rquery
are the class hierarchy structure of
this package.
## Not run: ## set up the database connection ## Assume that .port is port number and .dbname is the database name cid <- db.connect(port = .port, dbname = .dbname, verbose = FALSE) ## create a table from the example data.frame "abalone" delete("abalone", conn.id = cid) x <- as.db.data.frame(abalone, "abalone", conn.id = cid, verbose = FALSE) ## preview of a table lk(x, nrows = 10) # extract 10 rows of data ## get names of all columns dim(x) dim(x[,1:3]) db.disconnect(cid, verbose = FALSE) ## End(Not run)