Not-a-Number

(mathematics)(NaN) An IEEE floating point representationfor the result of a numerical operation which cannot return avalid number value. A NaN can result from multiplying aninfinity by a zero, or from subtracting one infinity fromanother NaN is encoded as a special bit pattern which would otherwise represent a floating-point number. Itis used to signal error returns where other mechanisms are notconvenient, e.g. a hardware floating-point unit and to allowerrors to propagate through a calculation.

Similar bit patterns represent positive and negativeoverflow and underflow and the positive and negativeinfinities resulting from division by zero.

Bit patterns.

[ANSI/IEEE Std 754-1985].

单词	not-a-number
释义	DictionarySeenan Not-a-Number Not-a-Number (mathematics)(NaN) An IEEE floating point representationfor the result of a numerical operation which cannot return avalid number value. A NaN can result from multiplying aninfinity by a zero, or from subtracting one infinity fromanother NaN is encoded as a special bit pattern which would otherwise represent a floating-point number. Itis used to signal error returns where other mechanisms are notconvenient, e.g. a hardware floating-point unit and to allowerrors to propagate through a calculation. Similar bit patterns represent positive and negativeoverflow and underflow and the positive and negativeinfinities resulting from division by zero. Bit patterns. [ANSI/IEEE Std 754-1985].
随便看	strauss, levi strauss, lewis strauss, lewis lichtenstein strauss, lotte strauss phenomenon strauss reaction strauss richard strauss, richard strauss, robert strauss, robert schwarz strauss syndrome strauss the elder strauss the younger straus, william l., jr. strautmanis, petr strautmanis, petr iakubovich strautman, ivars stravaig stravaiger stravinksy stravinski stravinskian stravinskianly stravinskii, fedor stravinskii, fedor ignatevich