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Mathematical Exceptions - HP -28S Manual

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CMD Off ( 1::110
). Command lines are not saved.
UNDO Mode
This mode determines whether a copy of the stack is saved when you
press
I
ENTER)
(or a key that performs ENTER).
UNDO On (
UNOO~
). The stack is saved for recovery by
. 1
UNDO ).
UNDO Off ( UNOO ). The stack is not saved.
LAST Mode
This mode determines whether copies of arguments are saved when a
command is executed.
LAST On (Flag 31 Set,
L~SH
).
Arguments are saved for recovery
by LAST or in case of error.
LAST Off (Flag 31
Clear,L~S.T
).
Arguments are not saved. If an
error occurs, the arguments to the last command are not returned to
the stack.
Mathematical Exceptions
Certain errors that can arise during ordinary real number calculations
are called
mathematical exceptions.
An exception can act as an ordinary
error and halt the calculation, or it can supply a default result and
allow the calculation to proceed.
Infinite Result Action
An Infinite Result exception occurs when a calculation returns an infi-
nite result. Examples include evaluation of
I
Lt-l (0)
I ,
I
TAt·l (90)
I
(in Degrees angle mode), or
I
::</~3
I •
Infinite Result Error On (Flag 59 Set). Infinite Result exceptions
are errors.
24: Modes
211

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