cov (DataFrame)

Calculate the sample covariance for the given columns, specified by their names, as a double value. DataFrame.cov and DataFrameStatFunctions.cov are aliases.

Syntax

cov(col1: str, col2: str)

Parameters

Parameter	Type	Description
col1	str	The name of the first column.
col2	str	The name of the second column.

Parameter	Type	Description
col1	str	The name of the first column.
col2	str	The name of the second column.

Returns

float: Covariance of two columns.

Examples

Python

df = spark.createDataFrame([(1, 12), (10, 1), (19, 8)], ["c1", "c2"])
df.cov("c1", "c2")
# -18.0
df = spark.createDataFrame([(11, 12), (10, 11), (9, 10)], ["small", "bigger"])
df.cov("small", "bigger")
# 1.0