HP 48GII

3-208 Full Command and Function Reference
The variables y
near
and y
far
are real numbers that set the y-coordinates for the view volume used in
3D plots. y
near
must be less than y
far
. These values are stored in the reserved variable VPAR.
Access: …µ
YVOL
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
y
near
y
far
→
See also: EYEPT, XVOL, XXRNG, YYRNG, ZVOL
YYRNG
Type: Command
Description: Y Range of an Input Plane (Domain) Command: Specifies the y range of an input plane
(domain) for GRIDMAP and PARSURFACE plots.
The variables y
y near
and y
y far
are real numbers that set the y-coordinates for the input plane. These
values are stored in the reserved variable VPAR.
Access: …µ
YYRNG
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
y
near
y
far
→
See also: EYEPT, XVOL, XXRNG, YVOL, ZVOL
ZEROS
CAS: Return the zeros of a function of one variable, without giving their multiplicity.
ZFACTOR
Type: Function
Description: Gas Compressibility Z Factor Function: Calculates the gas compressibility correction factor for
non-ideal behavior of a hydrocarbon gas.
x
Tr
is the reduced temperature: the ratio of the actual temperature (T) to the pseudocritical
temperature (T
c
). (Calculate the ratio using absolute temperatures.) x
Tr
must be between 1.05 and
3.0.
y
Pr
is the reduced pressure: the ratio of the actual pressure (P) to the pseudocritical pressure (P
c
).
y
Pr
must be between 0 and 30.
x
Tr
and y
Pr
must be real numbers or unit objects that reduce to dimensionless numbers.
Access: …µ
ZFACTOR
Flags: Numerical Results (-3)
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
x
Tr
y
Pr
→
x
Zfactor
x
Tr
'symb'
→
'ZFACTOR(x
Tr
,symb)'
'symb' y
Pr
→
'ZFACTOR(symb,y
Pr
)'
'symb
1
' 'symb
2
'
→
'ZFACTOR(symb
1
,symb
2
)'
ZVOL
Type: Command