Skip to contents

Category vector

Source: R/category_vector.R
category_vector.Rd

Convert an object containing binary (integer) columns into a integer vector indicating the column index where each row is 1.

Usage

category_vector(x)

# S3 method for class 'data.frame'
category_vector(x)

# S3 method for class 'sf'
category_vector(x)

# S3 method for class 'Spatial'
category_vector(x)

# S3 method for class 'matrix'
category_vector(x)

Arguments

x

matrix, data.frame, or sf::sf() object.

Value

An integer vector.

Details

This function is conceptually similar to base::max.col() except that rows with no values equal to 1 values are assigned a value of zero. Also, note that in the argument to x, each row must contain only a single value equal to 1.

See also

base::max.col().

Examples

# create matrix with logical columns
x <- matrix(c(1, 0, 0, NA, 0, 1, 0, NA, 0, 0, 0, NA), ncol = 3)

# print matrix
print(x)
#>      [,1] [,2] [,3]
#> [1,]    1    0    0
#> [2,]    0    1    0
#> [3,]    0    0    0
#> [4,]   NA   NA   NA

# convert to category vector
y <- category_vector(x)

# print category vector
print(y)
#> [1]  1  2  0 NA