On Sat, 8 Dec 2018 09:31:46 +0100
"Mikael P. Sundqvist"
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