Selecting the independent variable – HP 50g Graphing Calculator User Manual

Page 813

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Θ To recover the original menu in the CALCULATOR MODES input box, press

the L key. Of interest at this point is the changing of the CAS settings.
This is accomplished by pressing the

@@ CAS@@ soft menu key. The default

values of the CAS setting are shown below:

Θ To navigate through the many options in the CAS MODES input form, use

the arrow keys: š™˜—.

Θ To select or deselect any of the settings shown above, select the underline

before the option of interest, and toggle the

@ @CHK@@ soft menu key until the

right setting is achieved. When an option is selected, a check mark will be
shown in the underline (e.g., the Rigorous and Simp Non-Rational options
above). Unselected options will show no check mark in the underline
preceding the option of interest (e.g., the _Numeric, _Approx, _Complex,
_Verbose, _Step/Step, _Incr Pow
options above).

Θ After having selected and unselected all the options that you want in the

CAS MODES input form, press the

@@@OK@@@ soft menu key. This will take you

back to the CALCULATOR MODES input form. To return to normal
calculator display at this point, press the

@@@OK@@@ soft menu key once more.

Selecting the independent variable

Many of the functions provided by the CAS use a pre-determined independent
variable. By default, such variable is chosen to be the letter X (upper case) as
shown in the CAS MODES input box above. However, the user can change
this variable to any other letter or combination of letters and numbers (a
variable name must start with a letter) by editing the Indep var field in the CAS
MODES input box.

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