detect_const_cols: Detect if any column of a data.frame has constant values.

In dataframeexplorer: Familiarity with Dataframes Before Data Manipulation

Detect if any column of a data.frame has constant values.

Description

It occasionally happens that a column in dataframe contains a single value throughout. This could lead to redundant computational cost and unexpected behavior in Machine Learning methods. This function scans though all columns of dataframe to examine if any column has no variation.

Usage

detect_const_cols(dataset, return_type = "col_names", ignore_na = F)

Arguments

dataset	A data.frame
return_type	How to return detected constant columns Use "col_names", "col_positions" or "dataset" to return dataset with deleted constant columns
ignore_na	Whether NA should be ignored while checking if a column has just 1 unique value

Value

. A vector of constant column-names or column positions or dataset with deleted constant columns. Use return_type parameter to specify.

Examples

## Not run: 
detect_const_cols(dataset = head(mutate(mtcars, mpg_2 =  999)))

## End(Not run)

dataframeexplorer documentation built on April 4, 2022, 9:05 a.m.