nan

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In computing, NaN, which stands for Not a Number, is a value or symbol that is usually produced as the result of an operation on invalid input operands. For example, most floating-point units are unable to explicitly calculate the square root of negative numbers, and will instead indicate that the operation was invalid and return a NaN result.

An invalid operation is not the same as an arithmetic overflow (which returns a positive or negative infinity). Arithmetic operations involving NaN always produce NaN, allowing the value to propagate through a calculation so that errors can be detected at the end without extensive testing during intermediate stages.

In MagicPlot NaN also is used to represent empty cells in tables.

Expression | Result |
---|---|

`0^0` | `1` |

`0/0` | `NaN` |

`sqrt(-1)` | `NaN` |

`1/0` | `Infinity` |

`-1/0` | `-Infinity` |

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nan.1263239697.txt.gz · Last modified: Sun Nov 8 12:20:32 2015 (external edit)

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