How to plot2d bfzeta



Dear listreaders,

load ("bffac");
float(bfzeta(3,25));
(%o14) 			       1.202056903159594

OK so far.
Then
(%i18) plot2d(float(bfzeta(3,25)),[x,1,4]); works fine
But 
(%i20) plot2d(float(bfzeta(x,25)),[x,2,4]); yields only
Maxima was unable to evaluate the predicate:
x > 0
#0: bfzeta(s=x,fpp=25)(bffac.mac line 139)
 -- an error.  Quitting.  To debug this try debugmode(true);
Any ideas?
Thanks,
Seth Goldberg

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