Equation Writer Variables; Predefined Cas Variables - HP 40gs User Manual

hp40g+.book Page 16 Friday, December 9, 2005 1:03 AM
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Equation Writer variables

Predefined CAS variables

15-16
Press to obtain an
intermediate result, (4– 2)(4
+ 2), and again to
evaluate the intermediate
result. The final answer, as
before, is 12.
If you call a CAS function while you're writing an
expression, whatever is currently selected is copied to the
function's first or main argument. If nothing is selected,
the cursor is placed at the appropriate location for
completing the arguments.
You can store objects in variables, then access an object
by using the name of its variable. However, you should
note the following:
•
Variables used in CAS cannot be used in HOME, and
vice versa.
•
In HOME or in the program editor, use
an object in a variable.
•
In CAS, use the STORE command (on the
menu) to store a value in a variable.
•
The key displays a menu that contains all the
available variables. Pressing
HOME displays the names of the variables defined in
HOME and in the Aplets. Pressing
are in the Equation Writer displays the names of the
variables defined in CAS (as explained on
page 15-18).
•
VX contains the name of the current symbolic
variable. Generally, this is X, so you should not use X
as the name of a numeric variable. Nor should you
erase the contents of X with the UNASSIGN command
(on the menu) after having done a symbolic
calculation.
•
EPS contains the value of epsilon used in the EPSX0
command.
to store
while you are in
while you
Equation Writer