How to extract frequency from R table using vector of arguments

Question

I have a table, for example:

tbl <- table(iris[, 1:3])

I can extract frequency from the table this way:

tbl[['4.6', '3.6', '1']]

How to do the same if my values stored as vector

vars <- c('4.6', '3.6', '1')

In fact vars is named vector and I need general way to extract from tables.

Answer 1

You can convert vars to matrix and use it to subset tbl :

tbl[t(vars)]
#[1] 1

Answer 2

We can also use

tbl[matrix(vars, ncol = length(vars))]
#[1] 1