HP 48GII

3-4 Full Command and Function Reference
ABCUV
CAS: From polynomials a, b and constant c give polynomials u and v such that au+bv =c .
ABS
Type: Function
Description: Absolute Value Function: Returns the absolute value of its argument.
ABS has a derivative (SIGN) but not an inverse.
In the case of an array, ABS returns the Frobenius (Euclidean) norm of the array, defined as the
square root of the sum of the squares of the absolute values of all n elements. That is:
z
i
2
i 1=
n
∑
Access: !Ê ( Êis the left-shift of the /key).
Flags: Numerical Results (-3)
Input/Output:
Level 1/Argument 1 Level 1/Item 1
x
→
|x|
(x,y)
→
x
2
y
2
+
x_unit
→
|x|_unit
[array]
→
||array||
'symb'
→
'ABS(symb)'
See also: NEG, SIGN
ACK
Type: Command
Description: Acknowledge Alarm Command: Acknowledges the oldest past-due alarm.
ACK clears the alert annunciator if there are both no other past-due alarms and no other active
alert sources (such as a low battery condition).
ACK has no effect on control alarms. Control alarms that come due are automatically acknowledged
and saved in the system alarm list.
Access: …Ó TOOLS ALRM ACK (Ó is the right-shift of the 9 key).
Flags: Repeat Alarms Not Rescheduled (–43), Acknowledged Alarms Saved (–44)
Input/Output: None
See also: ACKALL
ACKALL
Type: Command
Description: Acknowledge All Alarms Command: Acknowledges all past-due alarms.
ACKALL clears the alert annunciator if there are no other active alert sources (such as a low
battery condition).
ACKALL has no effect on control alarms. Control alarms that come due are automatically
acknowledged and saved in the system alarm list.
Access: …Ó
TOOLS ALRM ACKALL ( Ó is the right-shift of the 9 key).
Flags: Repeat Alarms Not Rescheduled (–43), Acknowledged Alarms Saved (–44)