I recall some mailing list discussion of getting
float to work with erf(%i) during the last year.
Using latest gcl 5.27.0 shows that float doesn't
work here.
Also notice that if display2d is set to false, the
build_info() return looks weird.
------------------------------------
(%i1) build_info();
(%o1)
Maxima version: "5.27.0"
Maxima build date: "2012-05-08 11:27:57"
Host type: "i686-pc-mingw32"
Lisp implementation type: "GNU Common Lisp (GCL)"
Lisp implementation version: "GCL 2.6.8"
(%i2) display2d:false$
(%i3) erf(%i);
(%o3) erf(%i)
(%i4) float(%);
(%o4) erf(%i)
(%i5) subst(1.0*%i,%i,%);
(%o5) 1.650425758797543*%i
(%i6) build_info();
(%o6) ?%build_info("5.27.0","2012-05-08 11:27:57","i686-pc-mingw32",
"GNU Common Lisp (GCL)","GCL 2.6.8")
---------------------------
Ted Woollett