rfml (version 0.1.0)

cov,ml.col.def,ml.col.def-method: Covariance

Description

Returns the sample covariance of two variables, ml.data.frame fields.

Usage

"cov"(x, y = NULL, use = NULL, method = NULL)

Arguments

x

a ml.data.frame field.

y

a ml.data.frame field

use

not implemented

method

not implemented

Value

The sample covariance

Details

The function eliminates all pairs for which either the first element or the second element is empty. After the elimination, if the length of the input is less than 2, the function returns the empty sequence.

Examples

## Not run: 
#  library(rfml)
#  locConn <- ml.connect()
#  # create a ml.data.frame based on a search
#  mlIris <- ml.data.frame(locConn,collection = "iris")
#  # return the Covariance
#  cov(mlIris$Sepal.Length, mlIris$Petal.Length)
# ## End(Not run)