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~l1`™K
The figure below shows the RPN stack before pressing the
K
key:
Composing and decomposing lists
Composing and decomposing lists makes sense in RPN mode only. Under
such operating mode, decomposing a list is achieved by using function
OBJ
. With this function, a list in the RPN stack is decomposed into its
elements, with stack level 1: showing the number of elements in the list. The
next two screen shots show the stack with a small list before and after
application of function OBJ
:
Notice that, after applying OBJ
, the elements of the list occupy levels 4:
through 2:, while level 1: shows the number of elements in the list.
To compose a list in RPN mode, place the elements of the list in the stack,
enter the list size, and apply function
LIST (select it from the function
catalog, as follows:
‚N‚é
, then use the up and down arrow keys
(
—˜
) to locate function
LIST). The following screen shots show the
elements of a list of size 4 before and after application of function
LIST:
Note:
Function OBJ
applied to a list in ALG mode simply reproduces the
list, adding to it the list size: