[NTG-context] graphics

Alan Braslau braslau.list at comcast.net
Wed Dec 12 21:12:13 CET 2018

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...


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