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Count Difference in Occurrences of Vector Elements

Source: R/count_diff.R
count_diff.Rd

Counts the number of occurrences of each element in both provided vectors and then calculates the difference in that count between the first and second input vector. Counting of NAs in addition to non-NA values is supported.

Usage

count_diff(vec1, vec2, what = NULL)

Arguments

vec1

(vector) first vector containing elements to count

vec2

(vector) second vector containing elements to count

what

(vector) optional argument for what element(s) to count. If left NULL, defaults to all unique elements found in either vector

Value

(dataframe) four-column dataframe with as many rows as there are unique elements across both specified vectors or as the number of elements passed to 'what'. First column is named "value" and includes the unique elements of the vector, second and third columns are named "vec1_count" and "vec2_count" respectively and include the number of occurrences of each vector element in each vector. Final column is "diff" and the difference in the count of each element between the first and second input vectors

Examples

# Define two vectors
x1 <- c(1, 1, NA, "a", 1, "a", NA, "x")
x2 <- c(1, "a", "x")

# Count difference in number of NAs between the two vectors
supportR::count_diff(vec1 = x1, vec2 = x2, what = NA)
#>   value vec1_count vec2_count diff
#> 1  <NA>          2         NA   NA

# Count difference in all values between the two
supportR::count_diff(vec1 = x1, vec2 = x2)
#>   value vec1_count vec2_count diff
#> 1     1          3          1    2
#> 2  <NA>          2         NA   NA
#> 3     a          2          1    1
#> 4     x          1          1    0