HP 39gs Master Guide

SIZE(<list>) or SIZE(<matrix>)
This function returns the size of the list or matrix specified. Since normal
users would probably know anyway, and could find out easily via the list
catalog, this is clearly another of those functions which are of more use
to programmers (who won’t know when they write their program just
how long the list you will ask it to deal with will be when you eventually
run the program). If the object is a matrix then the return value is a two
element list as {rows, columns}.
Σ LIST(<list>)
This function returns the sum of all the elements of a list.
Eg.
LIST({2,3,5}) would return a value of 10.
REVERSE(<list>)
This function reverses the order of elements in a list.
Eg.
REVERSE({2,4,1,7,10}) would return {10,7,1,4,2}
SORT({list})
This function returns a list that is sorted into ascending order.
If you want the list in descending order instead then
use
REVERSE(SORT({list})).
See page
137 for an example of using
SORT to assign rank orders to a list of values.
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HP 39gs Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Gray
Internal memory	0.256 MB

Weight and Dimensions

Weight	249 g
Dimensions (WxDxH)	187 x 94 x 31 mm