is.na-method {PivotalR} | R Documentation |
This function is equivalent to an SQL query that checks if the entries in a table are NULL.
## S4 method for signature 'db.obj' is.na(x)
x |
The signature of the method. A |
is.na()
creates a db.Rquery
object where the NULL entries in a db.obj
object are TRUE
, and other the entries are FALSE
.
The return value is a db.Rquery
object.
Author: Predictive Analytics Team at Pivotal Inc.
Maintainer: Frank McQuillan, Pivotal Inc. fmcquillan@pivotal.io
lk
or lookat
Displays the contents of a db.obj
object.
## 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 temp table from the example data.frame "abalone" x <- as.db.data.frame(abalone, conn.id = cid, verbose = FALSE) #Query which entries of x are NULL is.na(x) y <- x y[is.na(y)] <- 3 z <- x z[is.na(x$height),"height"] <- 23 db.disconnect(cid, verbose = FALSE) ## End(Not run)