Not-a-Number
<mathematics> (NaN) An IEEE floating point representation for the result
of a numerical operation which cannot return a valid number value. A NaN can
result from multiplying an infinity by a zero, or from subtracting one infinity
from another [what else?].
NaN is encoded as a special bit pattern [what pattern?] which would otherwise
represent a floating-point number. It is used to signal error returns where
other mechanisms are not convenient, e.g. a hardware floating-point unit and to
allow errors to propagate through a calculation.
Similar bit patterns represent positive and negative overflow and underflow and
the positive and negative infinities resulting from division by zero.
Bit patterns.
[ANSI/IEEE Std 754-1985].
[Correct?]
(2001-04-01)
Nearby terms:
NorthWestNet « NOS « NOT « Not-a-Number »
notebook » NoteCards » Notepad
|
