fctutils (version 0.0.7)

ft_filter_pos: Remove Factor Levels with Specific Characters at Specified Positions

Description

Removes factor levels where a specified character appears at specified positions within the levels.

Usage

ft_filter_pos(
  factor_vec,
  positions = NULL,
  char,
  case = FALSE,
  remove_na = TRUE,
  invert = FALSE,
  .return = FALSE
)

Value

A factor vector with levels removed where the specified character appears at the specified positions.

Arguments

factor_vec

A factor vector from which levels will be removed.

positions

A vector of positive integers indicating the character positions to check.

char

A single character string specifying the character to look for.

case

Logical. Should the character matching be case-sensitive? Default is FALSE.

remove_na

remove NA from the output? Default is TRUE.

invert

logical. If TRUE return indices or values for elements that do not match.

.return

logical. If TRUE return TRUE or FALSE instead of element.

Author

Kai Guo

Examples

# Example factor vector
factor_vec <- factor(c('apple', 'banana', 'apricot', 'cherry', 'date', 'fig', 'grape'))

# Remove levels where 'a' appears at position 1
ft_filter_pos(factor_vec, positions = 1, char = 'a')

# Remove levels where 'e' appears at positions 2 or 3
ft_filter_pos(factor_vec, positions = c(2, 3), char = 'e')

# Case-sensitive removal
factor_vec_case <- factor(c('Apple', 'banana', 'Apricot', 'Cherry', 'Date', 'Fig', 'grape'))
ft_filter_pos(factor_vec_case, positions = 1, char = 'A', case = TRUE)