array.len {PivotalR} | R Documentation |
The column of a table in database can be an array. This function measures the length of the array.
array.len(x)
x |
A |
An integer, which is the length of the array.
Author: Predictive Analytics Team at Pivotal Inc.
Maintainer: Frank McQuillan, Pivotal Inc. fmcquillan@pivotal.io
db.array
combines columns of a table/view into an
array.
as.list
expands the db.obj
columns into a list of separated db.Rquery
objects.
cbind2
and cbind
combine multiple db.obj
objects into one 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) delete("abalone", conn.id = cid) x <- as.db.data.frame(abalone, "abalone", conn.id = cid, verbose = FALSE) y <- db.array(x[-2]) # put columns into an array names(y) # "agg_opr" array.len(y$agg_opr) # 9 db.disconnect(cid, verbose = FALSE) ## End(Not run)