Eyept; Fact - HP 48gII Advanced User's Reference Manual

For values of x close to zero, EXPM(x) returns a more accurate result than does EXP(x)–1.
(Using EXPM allows both the argument and the result to be near zero, and avoids an
intermediate result near 1. The calculator can express numbers within 10
only 10
–11
!´
Access:
!Ð
Flags: Numerical Results (–3)
Input/Output:
See also: EXP, LNP1

EYEPT

Type: Command
Description: Eye Point Command: Specifies the coordinates of the eye point in a perspective plot.
x , y , and z
point point
which to view a 3D plot ' s view volume. The y-coordinate must always be 1 unit less than the
view volume ' s nearest point (y
variable VPAR.
...µ
Access:
Input/Output:
See also: NUMX, NUMY, XVOL, XXRNG, YVOL, YYRNG, ZVOL
F0
Type: Function
Description: Black Body Emissive Power Function: Returns the fraction of total black-body emissive power
at temperature x
units of meters and x
F0 returns a dimensionless fraction.
...µ
Access:
Flags: Numerical Results (–3)
Input/Output:

FACT

Type: Command
Description: Factorial (Gamma) Function: FACT is the same as !.
of 1.)
L
HYPERBOLIC EXPM
EXPM
Level 1/Argument 1
x
'symb'
are real numbers that set the x-, y-, and z-coordinates as the eye-point from
point
of YVOL). These coordinates are stored in the reserved
near
EYEPT
Level 3/Argument 1 Level 2/Argument 2
x
point
between wavelengths 0 and y
T
has implied units of K.
T
0
F
Level 2/Argument 1 Level 1/Argument 2
y
lambda
y
lambda
'symb'
'symb '
1
( ´ is the left-shift of the Pkey).
(Ð is the left-shift of the 8key).
Level 1/Argument 3
y z
point point
. If units are not specified, y
lambda
x
T
'symb'
x
T
'symb '
2
Full Command and Function Reference 3-61
of zero, but within
–449
Level 1/Item 1
e – 1
x
'EXPM(symb)'
Level 1/Item 1
has implied
lambda
Level 1/Item 1
x
power
'F0 (y ,symb)'
lambda
'F0 (symb,x )'
T
'F0 (symb ,symb )'
1 2