I would like to modify log so that it uses the CL log function
for complex double float arguments. Doing this isn't difficult,
but I don't know what to do with things like log(1.2 + %i*5.6)
when 'lognumer' is true. If you don't know, lognumer makes
log *sometimes* behave as log composed with abs.
(%i1) lognumer : true$
(%i2) float(log(-5));
(%o2) 1.6094379124341003
bfloat (and rectform) ignores lognumer:
(%i3) bfloat(log(-5));
(%o3) 3.141592653589793B0*%i+1.6094379124341B0
log is really messed up when lognegint == true
and lognumer == true:
(%i4) lognegint : true$
(%i5) log(-5);
(%o5) log(5)+%i*%pi
(%i6) log(-5.0);
(%o6) 1.6094379124341003
The function 'plog' matches my expectations:
(%i7) plog(-5);
(%o7) log(5)+%i*%pi
(%i8) plog(-5.0);
(%o8) %i*%pi+1.6094379124341003
Suggestions?
Barton