Convert a data.frame or matrix containing binary (integer) fields (columns) into a integer vector indicating the column index where each row is 1.

category_vector(x)

# S3 method for data.frame
category_vector(x)

# S3 method for matrix
category_vector(x)

Arguments

x

matrix object.

Value

integer vector

Details

This function is conceptually similar to 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

Examples

# create matrix with logical fields 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