is_single_negative.Rd
Tests if an object is a single negative number
is_single_negative(x)
an R object
is_single_negative(1.0) # FALSE
#> [1] FALSE
is_single_negative(-1.0) # TRUE
#> [1] TRUE
is_single_negative(c(-1.0,-2)) # FALSE
#> [1] FALSE
is_single_negative(0) # FALSE
#> [1] FALSE
is_single_negative(NA) # FALSE
#> [1] FALSE