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## interval arithmetic

**From**: |
Geordie McBain |

**Subject**: |
interval arithmetic |

**Date**: |
Mon, 4 Aug 2003 11:52:39 +1000 |

The Emacs program GNU Calc has this capacity. It allows `interval
forms' and `error forms': e.g.
sqrt([2 .. 4])
=> [1.41421356237 .. 2]
sqrt(3 +/- 1)
=> 1.73205080757 +/- 0.288675134595
>*Not to say that something useful couldn't be done. It should be *
>*possible to pass*
>*numbers with a precision qualifier and propagate it through your *
>*equations, but*
>*nobody has done this and I don't know of any other numerical *
>*packages/spreadsheets*
>*that do.*
>
>*Happy computing,*
>
>*Willem*
>
>
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