An interval is a 2-element list x of numbers
where <:/x and:
...
ivdivide=: (<./,>./) @ , @ (%/ ([ [EMAIL PROTECTED]@contain0)) " 1
contain0=: ({.<:0:) *. (0:<:{:)
----- Original Message -----
From: Roger Hui <[EMAIL PROTECTED]>
Date: Tuesday, February 27, 2007 7:54 am
Subject: Re: [Jprogramming] Precision, accuracy, and certainty [Was: Lack of
precision ?]
> Neville Holmes writes:
>
> > ...
> > Nevertheless, it would be good if the J
> > interpreter would eventually support modern
> > interval arithmetic. This would certainly be
> > appreciated in many mathematical circles in
> > Europe.
>
> To that end, it would be useful to first provide a
> J model interval arithmetic. For example:
>
> An interval is a 2-element list of numbers and:
>
> ivplus =: +"1
> ivminus =: -"1
> ivtimes =: (<./,>./) @ , @ (*/) " 1
> ivdivide=: (<./,>./) @ , @ (%/ assert@(0~:])) " 1
> assert =: 13!:8 @ ($&12) @ (0 e. ,)
>
> etc.
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