HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 215

31 WORKING WITH LISTS A list in the hp 39gs or hp 40gs is the equivalent of a mathematical set. As with a set, it is written as numbers separated by commas and enclosed with curly brackets. Eg. {2,5,-2,10,3.75} The list variables Using the HOME view these lists can be stored in special list variables. There are ten of these L1,L2,..L9,L0. Eg. {2,5,-2,10,3.75} L1 Operations on lists Typing L1 and then ENTER will then retrieve the list. Lists can also be multiplied by a constant and have a constant added to them (see below) If we store another list of the same length into L2, then the two lists can be multiplied together. The resulting list is obtained by multiplying each element in the first list by the matching element in the second list. Many of the normal mathematical functions also work on lists of numbers by performing the operation on each individual element. Lists on the calculator can contain more than simply numbers. For example, the return value for some matrix functions is a list where each element is a matrix. Elements of a list can be matrices, lists and many other things. Statistical columns as lists The column variables C1,C2..C9,C0 in the Statistics aplet are actually list variables attached to their aplet and can be used as extra storage if you need more list variables. The statistical variables have the additional advantage, of course, that they can be graphed in the Statistics aplet and with all the usual statistical analysis measures available. To transfer a list variable to a statistics variable, just store one into the other (see right). As you can see in the second view, the list has been transferred to C1. Pressing would now give the usual statistical measures for the newly created column. 215