Get the first element of a vector

Extract the first element of a vector. Useful for the turnogram() function

first(x, na.rm=FALSE)

Arguments

x

a numerical vector

na.rm

if na.rm=TRUE, then the first non-missing value (if any) is returned. By default, it is FALSE and the first element (whatever its value) is returned

Value

a numerical value

Author

Philippe Grosjean (phgrosjean@sciviews.org), Frédéric Ibanez (ibanez@obs-vlfr.fr)

See also

last, turnogram

Examples

a <- c(NA, 1, 2, NA, 3, 4, NA)
first(a)
#> [1] NA
first(a, na.rm=TRUE)
#> [1] 1