3-26 Full Command and Function Reference
CENTR
Type: Command
Description: Center Command: Adjusts the first two parameters in the reserved variable PPAR, (x
min
, y
min
)
and (x
max
, y
max
), so that the point represented by the argument (x, y) is the plot center. On the
hp49g+, the center pixel is in row 40, column 65 when PICT is its default size (131 × 80). On
the hp48gII, the center pixel is in row 32, column 65 when PICT is its default size (131 × 64).
If the argument is a real number x, CENTR makes the point (x,0) the plot center.
Access: …µ
CENTR
Input/Output:
Level 1/Argument 1 Level 1/Item 1
(x, y)
→
x
→
See also: SCALE
CF
Type: Command
Description: Clear Flag Command: Clears the specified user or system flag.
User flags are numbered 1 through 128. System flags are numbered –1 through –128. See
Appendix C for a listing of hp49g+/hp48gII system flags and their flag numbers.
Access: !°
TESTLLCF ( °is the left-shift of the Nkey).
Input/Output:
Level 1/Argument 1
Level 1/Item 1
n
flagnumber
→
See also: FC?, FC?C, FS?, FS?C, SF
%CH
Type: Function
Description: Percent Change Function: Returns the percent change from x to y as a percentage of x.
If both arguments are unit objects, the units must be consistent with each other. The dimensions
of a unit object are dropped from the result, but units are part of the calculation.
For more information on using temperature units with arithmetic functions, refer to the keyword
entry of +.
Access: !´
REAL %CH ( ´ is the left-shift of the Pkey).
Flags: Numerical Results (–3)
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
x y
→
100(y – x)/x
x 'symb'
→
'%CH(x,symb)'
'symb' x
→
'%CH(symb,x)'
'symb
1
' 'symb
2
'
→
'%CH(symb
1
, symb
2
)'
x_unit y_unit
→
100(y_unit – x_unit)/x_unit
x_unit 'symb'
→
'%CH(x_unit,symb)'
'symb' x_unit
→
'%CH(symb,x_unit)'
See also: %, %T
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