[NTG-context] graphics

Henri Menke henrimenke at gmail.com
Wed Dec 12 22:03:40 CET 2018



On 13/12/18 9:12 AM, Alan Braslau wrote:
> On Thu, 13 Dec 2018 09:02:05 +1300
> Henri Menke <henrimenke at gmail.com> wrote:
> 
>> On 13/12/18 8:56 AM, Alan Braslau wrote:
>>> On Wed, 12 Dec 2018 20:42:56 +0100
>>> "Mikael P. Sundqvist" <mickep at gmail.com> wrote:  
>>>>
>>>> Thanks, Alan! That looks very promising. I could not make it work,
>>>> though, and I guess that is because I use linux and do not know
>>>> what to change for what. I installed libcerf but I assume
>>>> something else is missing. In any case, this is one of the things
>>>> it would be nice to have, at least as a module. I have no idea on
>>>> how to realize that, though.
>>>>
>>>> /Mikael  
>>>
>>> You likely also need to install libffi - I do not know what package
>>> this is on your flavor of linux - Luigi is the ffi specialist!  
>>
>> FFI is integrated in LuaTeX >= 1.03
>>
>> In you example you load libcerf but you are not using it.  What you
>> are actually using are the Bessel function from the C Standard
>> library.  GCC includes them as a GNU extension.
>> https://www.gnu.org/software/libc/manual/html_node/Special-Functions.html#index-j0
>> Your example also works if you remove libcerf (at least for me on
>> Linux).
> 
> I had stripped-down my example, for in fact I use the voigt and error
> functions from libcerf, and yes the Bessel functions from the standard
> C math library. One should note, by the way, that the C math library is
> more or less complete depending on the system, and not everyone uses
> gcc nor gnu...

Sorry, my mistake, the Bessel functions are not a GCC extension but
POSIX standard functions.
http://pubs.opengroup.org/onlinepubs/9699919799/functions/j0.html
Since TeX Live is always built on a POSIX platform (MSYS2 on Windows),
you can expect j0 etc. to be available in LuaTeX.

> 
> Alan
> 



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