HP 39gs Graphing manual 2,3 returns 5,10,15, CONCATlist1,list2, CONCAT1,2,3,4 returns 1,2,3,4

CONCAT(L1,L2). An argument can be either a list variable name (such as L1) or the actual list. For example, REVERSE({1,2,3}).

• If Decimal Mark in Modes is set to Comma, use periods to separate arguments. For example, CONCAT(L1.L2).

	Common operators like +, –, ×, and / can take lists as
	arguments. If there are two arguments and both are lists,
	then the lists must have the same length, since the
	calculation pairs the elements. If there are two arguments
	and one is a real number, then the calculation pairs the
	number with each element of the list.
	Example
	5*{1,2,3} returns {5,10,15}.
	Besides the common operators that can take numbers,
	matrices, or lists as arguments, there are commands that
	can only operate on lists.
CONCAT	Concatenates two lists into a new list.
	CONCAT(list1,list2)
	Example
	CONCAT({1,2,3},{4}) returns {1,2,3,4}.
ΔLIST	Creates a new list composed of the first differences, that
	is, the differences between the sequential elements in
	list1. The new list has one fewer elements than list1. The
	first differences for {x1 x2 ... xn} are {x2–x1 ...xn–xn–1}.
	ΔLIST(list1)

Lists 16-7