HP 49g Graphing Calculator - Manual (Page 38)

Chapter 4
The Stack
The HP 49G keeps a record of the objects you enter and the results of your
operations. In algebraic mode this record is called history; in RPN mode it
is called the stack.
Using the stack
Entries on the stack are niunbered (as in the
example at tire riglrt). Air entry on the stack is
referred to as being on a particular level. The
level is the number of the line on which the
entiy appears. In the example at the right, 58
is on level 4, 6 is on level 3,
is on level
2, and so on.
RMi KVZ HEK R= 'K'
■ CHOHE? __________
isiaBniiSiaBi
58
___ 6
■J8745
93.514704726
If you are working in RPN mode, you will use the stack to perfonn
calculations. In doing so, you need to be aware of differences between the
way calculations are performed and displayed in RPN mode and in
algebraic mode, hr RPN mode:
® A command that requires arguments—that is, a command that needs
objects to act on—takes its arguments from the stack. Therefore, the
arguments must be present before you execute the command: one
argument per level and in the correct order. (There is one exception:
when the command takes only one argument, you can execute the
command with the argument on tire command line, not on the stack.)
• A command’s arguments are removed from the stack when the
command is executed. The argmrrents are replaced by the result of the
calculation.
In contrast, in algebraic mode you specify your arguments after you enter
the commaird, and the command and its arguments are retained in history
together with the result of the calculation.
For example, to find the cube of 52, you need to specify two arguments:
the nimrber (52) and the index (3). In algebraic mode, you enter:
52 (>^j3 (ENTER)
The Stack Page 4-1