is.Unitless function

is.Unitless - Test whether object is unitless

Tests whether a 'units' object is actually unitless. Unitless objects, such as ratios, should be assigned units of '[1]'. Often they are, but sometimes unitless ratios are assigned units like '[m/m]'. The units package should always convert '[m/m]' to '[1]', but it does not always. Sometimes units like '[m/m]' mess things up, so it is better to remove them before calculations.

is.Unitless(obj)

Arguments

• obj: A numeric scalar or vector, with or without units.

Returns

TRUE if obj has units and they are either '[1]' or the denominator units equal the numerator units. Otherwise, return FALSE. If obj does not have units, this routine returns TRUE.

Examples

a <- units::set_units(2, "m")
b <- a / a
is.Unitless(a)
is.Unitless(b)
is.Unitless(3)