genvar (version 0.0.1.4)

count: Counts how many observations (optionally, satisfying a condition)

Description

Counts how many observations (optionally, satisfying a condition)

Usage

count(ifstmt = NULL)

Arguments

ifstmt

an optional argument which gives an condition that must be met for the observation to be counted

Value

returns NULL, invisibly

Examples

# NOT RUN {
use(cars, clear=TRUE)
count()
count("speed <= 20")
# }