x is positive (with or without zero allowed) — assert

Check that value x is positive

assert_pos(
  x,
  zero_allowed = TRUE,
  message1 = "%s must be greater than or equal to zero",
  message2 = "%s must be greater than zero",
  name = deparse(substitute(x))
)

Arguments

x	Value to check if positive
zero_allowed	Indicator (TRUE/FALSE) of whether zero is allowed
message1	Message to output if x is negative (when zero allowed)
message2	Message to output if x is not positive (when zero disallowed)
name	Name

Details

Check that x is positive (zero allowed or disallowed using zero_allowed parameter)