[luatex] Lua is removing hyperbolic functions

[Hans Hagen]

On 7/18/2014 3:25 AM, Reinhard Kotucha wrote:
> On 2014-07-09 at 08:20:36 +0200, Dirk Laurie wrote:
>
>   > Lua is now in 5.3-work3. It contains three things of possible
>   > importance for LuaTeX:
>   >
>   > 1. Basic UTF-8 (not Unicode) support.
>   > 2. Integer and bitwise arithmetic operators on 64-bit numbers.
>   > 3. cosh, sinh, tanh have been deprecated: not in the manual
>   >    but still available through a compatibility option that is
>   >    activated by default.
>   >
>   > If any LuaTeX user can give good reasons why the hyperbolic
>   > functions should stay, now is the time to air them on the
>   > Lua mailing list (http://lua.org).
>
> Hi Dirk,
> a good reason is that in the TeX world we can't afford that things
> change frequently.  No problem when things are added but it's annoying
> if things are removed.
>
> I'm not good in mathematics but I suppose that the hyperbolic
> functions could be implemented quite efficiently in Lua as long as the
> exponentional function (written in C) is available.
>
> But I'm wondering why one wants to remove the hyperbolic functions at
> all.  Don't they work properly?  If the sole purpose is to make the
> math library as small as possible, I think that it's better to disable
> the code instead of removing it.  What I have in mind is something
> like "#ifdef HYPERBOLIC" or similar.  The code can be re-activated
> easily then.  Or are the hyperbolic functions too hard to maintain?

we can keep them in luatex anyway

Hans


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