HP 49g Graphing Calculator - Manual (Page 50)

You can use the result of a previous calculation in a new calculation by
entering ANS( h ) where
n
is the number of the answer; 1 for the last
answer,
2
for the second last, and so on. Wlien you press (EÑTffl). the
corresponding answer is copied to the cursor location on die command
line.
RPN mode
“RPN” stands for
reverse Polish notation.
In RPN mode, you typically
enter an argument
before
the command. For example, to find sin(30) in
RPN mode, you enter the argument —30—and then specify the coimnand:
In RPN mode, the results of previous calculations are listed as they are in
algebraic mode. However, only the results—not the calculations—are
listed.
This list of prior results—and other
objects—is known as the
stack,
and each
item on the stack is numbered (as in the
example at the right).
ftlHD HVZ HEK K=
■IHdHE}_________
700
3: 241.25
2 : 1
1 : J _
___________________________ 65
If a calculation yields a number of results,
each result is displayed as a separate item
on the stack. (Some results may, however, be given as a list of results.)
The HP 49G has numerous conunands for manipulating the objects on the
stack. See appendix E, “Worldng in RPN mode”.
For information on switching between algebraic and RPN display modes,
see “Changing a mode” on page 2-18.
Exact and approximate modes
The results of calculations can be displayed in exact mode or approximate
mode. The default results mode—for both algebraic and RPN display
modes—is exact.
See “Changing a mode” on page 2-18 for information on how to change
modes. See chapter 5, “Working with expressions”, for information on
how this mode affects computer algebra fimctions.
Page 2-22 Basic operation