HP 39gs Master Manual page 363

Below the title bar you can see the first section of a series of alternatives which let you manipulate the
configuration. Most alternatives are toggles having only two values. For example, choosing
pressing will cause the menu to momentarily disappear and then re-display with the new setting of
ENTER
. Pressing
Real ENTER
the menu is the one that is NOT in use! For example, if it shows
vice versa. Using the menu you can choose:
Quit config
Complex
Approx
Direct
1 + x + x²
Sloppy
Num. factor
Cmplx
vars
English
Default cfg
Pressing takes you out of the
from the menu and confirming it with
changes you have made.
The only difference between the two configuration menus shown right is
that the lower one is harder to use and contains one option not available
on the upper one – the ability to select French as the language in which
the help screens are displayed.
The name of the current variable, as well as the value of the variable
, can be changed by means of the
MODULO
by using the key. Many of the configurations addressed in the
VARS
menu are also referenced in these views. Press
CFG
configuration view.
VARS
The information supplied in the manual on the various configuration
states is quoted below for reference together with comments and suggestions.
Approximate vs. Exact mode
When the approximate mode is selected, symbolic operations (for example, definite integrals, square
roots, etc.), will be calculated numerically. When this mode is unselected, exact mode is active, hence
symbolic operations will be calculated as algebraic expressions, whenever possible. [Default:
unselected.]
Comment:
Generally you will want to stay in Exact mode because this gives answers as surds, fractions of
pi and so on. If you want a decimal result, simply highlight the expression you want converted
and press
equivalent to calling the
again will revert back to
(when you're finished making changes)
(or )
Real
(or )
Exact
(or
Step by Step
(or x² + x +1 ; governs how polynomials will display)
(or , if you want to work in absolute values)
Rigorous
(or
Symb factor
(or Real vars if you want all symbolic variables to be assumed real)
(or if you want the help screens to be in French)
Français
(which is R= STEP ↓ X 13 ||).
menu (as does choosing
CFG
) but does not discard any
SHIFT MODES
. Press
NUM SHIFT NUM
function.
XQ
. It is important to realize that the entry shown in
Complex
Complex
see following page)
)
QUIT
view, or
to exit the
ON
to convert in the other direction.
363
Complex
then you are in mode and
Real
SHIFT NUM
and
is