# Abcuv; Abs; Ack; Ackall - HP 48gII Advanced User's Reference Manual

Graphing calculator.

## ABCUV

CAS:
From polynomials a, b and constant c give polynomials u and v such that au+bv =c .

### ABS

Function
Type:
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:
Access:
Flags:
Numerical Results (-3)
Input/Output:
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.
...Ó
Access:
Flags:
Repeat Alarms Not Rescheduled (–43), Acknowledged Alarms Saved (–44)
Input/Output:

### 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.
...Ó
Access:
Flags:
Repeat Alarms Not Rescheduled (–43), Acknowledged Alarms Saved (–44)
3-4 Full Command and Function Reference
Level 1/Argument 1
x
(x,y)
x_unit
[array]
'symb'
TOOLS ALRM ACK
None
TOOLS ALRM ACKALL
n
2
z
i
i
=
1
( Êis the left-shift of the /key).
(Ó is the right-shift of the 9 key).
( Ó is the right-shift of the 9 key).
Level 1/Item 1
|x|
2
2
x
+
y
|x|_unit
||array||
'ABS(symb)'