Program Constants And Physical Constants; Program Constants - HP 39gs User Manual

Program constants and physical constants

Program constants

13-24
This result is derived from substituting X=S1 and X=0 into
the original expression found in step 1. However,
substituting X=0 will not always evaluate to zero and may
result in an unwanted constant.
To see this, consider:
The 'extra' constant of 6.4
results from the
x =
substitution of
5
(x – 2) /5, and should be
disregarded if an
indefinite integral is
required.
When you press
constants become available:
•
the math functions menu (which appears by default)
•
the program constants menu, and
•
the physical constants menu.
The math functions menu is described extensively earlier
in this chapter.
The program constants are numbers that have been
assigned to various calculator settings to enable you to
test for or specify such a setting in a program. For
example, the various display formats are assigned the
following numbers:
1 Standard
2 Fixed
3 Scientific
4 Engineering
5 Fraction
6 Mixed fraction
In a program, you could store the constant number of a
particular format into a variable and then subsequently
test for that particular format.
x (
4
∫
( )
-------------------
x 2 – d x =
0
into
, three menus of functions and
Using mathematical functions
5
2 )
–
5