db.Rcrossprod-class {PivotalR} | R Documentation |
"db.Rcrossprod"
This is the result generated by crossprod
, and a
sub-class of db.Rquery
As a sub-class of db.Rquery
, this class contains
all the slots that belong to db.Rquery
. It also
has one additional slot as is described in the following.
.is.crossprod
:A vector of logical values, which has the same length as the
number of columns. Whether each column is the result of
crossprod
.
.is.symmetric
:A vector of logical values, which has the same length as the number of columns. Whether the column contains matrices that are symmetric.
.dim
:Dimension of the matrix represented by this object.
Class "db.Rquery"
, directly.
All methods for db.data.frame
can be applied onto
this class.
Author: Predictive Analytics Team at Pivotal Inc.
Maintainer: Frank McQuillan, Pivotal Inc. fmcquillan@pivotal.io
db.Rquery
is the superclass.
lk
or lookat
display the matrix
## Not run: showClass("db.Rcrossprod") ## 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) ## x points to table "abalone" x <- as.db.data.frame(abalone, conn.id = cid, verbose = FALSE) lookat(crossprod(x[,-c(1,2)])) x$arr <- db.array(1, x$length, x$diameter) lookat(crossprod(x$arr)) db.disconnect(cid, verbose = FALSE) ## End(Not run)