is_quantity - Function

Check if quantity

Synopsis
is_quantity(v)

Arguments

v	in	value to be tested
		Allowed:	any

Returns
Bool

Description
Checks if the operand is a correct quantity

Example

- a := dq.quantity("5Jy")		# make a quantity
- a
[value=5, unit=Jy] 
- is_quantity(a)			# is it one?
T 
- is_quantity("5Jy")			# and this string?
F

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	Package	general
	Module	quanta