On Sat, Dec 8, 2018 at 4:15 PM Alan Braslau <braslau.l...@comcast.net> wrote:
>
> On Sat, 8 Dec 2018 09:31:46 +0100
> "Mikael P. Sundqvist" <mic...@gmail.com> wrote:
>
> > 3) It would be nice to be able to plot some special functions. I'm
> > thinking of the usual suspects, Airy, Bessel, Hypergeometric,
> > Laguerre, Legendre, ... Could it be that one could have support via
> > some lua library?
>
> I use ffi and libcerf (thank you Luigi!)
> For example (lots of other functions are available):
>
> \startluacode
>
> ffi = require("ffi")
> ffi.cdef[[
> double j0(double x);
> double j1(double x);
> double jn(double x);
> ]]
>
> cerf = ffi.load(ffi.os == "OSX" and "/opt/local/lib/libcerf.dylib" or "cerf")
>
> \stopluacode
>
> \startMPdefinitions {doublefun}
>
> vardef jzero primary x = scantokens(lua("mp.quoted( ffi.C.j0(" & decimal x
> & "))")) enddef ;
> vardef jone primary x = scantokens(lua("mp.quoted( ffi.C.j1(" & decimal x
> & "))")) enddef ;
> vardef jn primary x = scantokens(lua("mp.quoted( ffi.C.jn(" & decimal x
> & "))")) enddef ;
>
> \stopMPdefinitions
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
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