HP 50G, User Manual

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_Last Stack : Keeps the contents of the last stack entry for use with the functions
UNDO and ANS (see Chapter 2).
The _Beep option can be useful to advise the user about errors. You may want
to deselect this option if using your calculator in a classroom or library.
The
_Key Click option can be useful as an audible way to check that each
keystroke was entered as intended.
The
_Last Stack option is very useful to recover the last operation in case we
need it for a new calculation.
To select, or deselect, any of these three options, first press the
H
button.
Next,
Θ
Use the down arrow key,
˜
, four times to select the _Last Stack option.
Use the
@ @CHK@@
soft menu key to change the selection.
Θ
Press the left arrow key
š
to select the _Key Click option. Use the
@ @CHK@@
soft menu key to change the selection.
Θ
Press the left arrow key
š
to select the _Beep option. Use the
@ @CHK@@
soft
menu key to change the selection.
Press the
!!@@OK#@
soft menu key to complete the operation.
Selecting CAS settings
CAS stands for C omputer A lgebraic S ystem. This is the mathematical core of
the calculator where the symbolic mathematical operations and functions are
programmed and performed. The CAS offers a number of settings can be
adjusted according to the type of operation of interest. These are:
Θ
The default independent variable
Θ
Numeric vs. symbolic mode
Θ
Approximate vs. Exact mode
Θ
Verbose vs. Non-verbose mode
Θ
Step-by-step mode for operations
Θ
Increasing power format for polynomials
Θ
Rigorous mode
Θ
Simplification of non-rational expressions
Details on the selection of CAS settings are presented in Appendix C.