detect_const_cols {dataframeexplorer}

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)