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RE: round symbol

From: Daniel Marques <dani@wiris.com>
Date: Mon, 5 Nov 2012 15:38:26 +0100
Message-ID: <de5e3c261a90b84456db822d94246e2b@mail.gmail.com>
To: Paul Libbrecht <paul@hoplahup.net>, David Carlisle <davidc@nag.co.uk>
Cc: www-math@w3.org
Hi,

Looking into detail the OpenMath specification for "rouding1/round",
appears the property "Also round to even in event of a tie", which is
quite restrictive. I understand that I should adhere to such definition if
using "rounding1/round".

We only plan to edit Content MathML without any specific semantics behind
it. See http://www.wiris.com/editor/docs/content-MathML

As part of the editor, we provide a simple evaluation of formulas. But
this feature is not a priority and we prefer generate "good" Content
MathML independently of the "round" interpretation we give right now.

Another option could be, <ci>round</ci> which is more general and allows a
free interpretation by the posterior usage of the content MathML.

Dani




-----Original Message-----
From: Paul Libbrecht [mailto:paul@hoplahup.net]
Sent: lunes, 05 de noviembre de 2012 13:54
To: David Carlisle
Cc: Daniel Marques; www-math@w3.org
Subject: Re: round symbol

Dani,

We all know the variants of round and their behaviour differences.
I'd be mooost interested if you gave a little try to interoperate...
Take round(-3.5) and evaluate it in Maple, Mathematica, Wiris, Yacas,
Sage, Maxima, ...
(ideally you should also try Excel, Apple Numbers, OpenOffice, ... but I
doubt they understand MathML-Content or OpenMath).

paul


Le 5 nov. 2012 à 13:16, David Carlisle a écrit :

> On 05/11/2012 11:48, Daniel Marques wrote:
>> Hello,
>>
>> We need to represent expressions involving the "round" function in
>> content MathML.
>>
>> For ceiling and floor there exists the tags <ceiling/> and <floor/>.
>> Is there any one for round?.
>>
>> I assume that one possibility is to use <csymbol
>> cd="rounding1">round</csymbol>. Is that the preferred one?
>>
>> Dani
>>
>
> Yes I think that is correct as long as that is the variant of round
> that you want (round half even) Different systems use different
> terminology here for example xpath has two round functions
>
> http://www.w3.org/TR/xpath-functions/#func-round
>
> http://www.w3.org/TR/xpath-functions/#func-round-half-to-even
>
>
> Depending what other functions you need you may find it more convenient
to use your own CD with exactly the right set of functions, or perhaps
not, it all depends....
>
> David
>
>
Received on Monday, 5 November 2012 14:38:33 GMT

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