Hi:
The manual
http://maxima.sourceforge.net/docs/manual/en/maxima_16.html#SEC52
says i0(z) has been deprecated
and to use bessel_i(0,z) instead. However,
i0(x) still works (fortunately) since bessel_i(0,x)
does not:
(%i2) i0(1);
(%o2) 1.266065877752009
(%i3) bessel_i(0,1);
(%o3) bessel_i(0, 1)
(%i5) bessel_i(0,1.0);
(%o5) bessel_i(0, 1.0)
(%i6) bessel_j(0,1.0);
(%o6) 0.76519768655797
The j-Bessel function seems to be okay though.
- David Joyner