rfml (version 0.1.0)

cor,ml.col.def,ml.col.def-method: Correlation

Description

Returns the Pearson correlation coefficient between two ml.data.frame fields.

Usage

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

Arguments

x

a ml.data.frame field.

y

a ml.data.frame field

use

not used currently

method

not used currently

Value

The correlation coefficient

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. After the elimination, if the standard deviation of the first column or the standard deviation of the second column is 0, 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 correlation
#  cor(mlIris$Sepal.Length, mlIris$Petal.Length)
# ## End(Not run)