I want to make a simple plot for a talk. As an experiment I try

plot(x^2,2,10)     (*)

and it works as expected. So happily I go for the real thing

plot(zeta(x),2,10)       (**)

Unfortunately I get a long list of exceptions but no clear indication
what the problem is.

plot(zeta,2,10)    (*)

yields an empty plot.

plot(real(zeta(x)),2,10)

gives again exceptions.....

After several tries I finally find something that works

plot(lambda x:real(zeta(x)),2,10)    (**)

In retrospect I can explain why this magic incantation makes sense.
But I think many users  will be baffled by the difference in
complexity between (*) and (**). In Maple there is no difference
between (*) and (**).

This is sage 3.0.5.  Released 2008-07-11.

Best regards,
Michel

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