Fwd: Maxima: How to plot "numerically" defined function?

The following appeared on sci.math.symbolic on 2004-11-11 03:21:41 PST:

From: phuck at web

Hello,

hope somebody can help me here.
I have problem to plot functions in Maxima, if these functions are only
defined by their numerical value, for example:
If I define a function

g(x) := ROMBERG( f(t), t,0,x);   (ROMBERG == numerical integration)

where f is an arbitrary other functions (in the case I want to "study",
it's a function which involves elliptic functions, that maxima can't
exlicityle integrate...) and do a

plot2d(f(x),[x,-2,2]);

I get the following error

Maxima encountered a Lisp error:

\;
\ Type-error in KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER: \ \|$x\| is not
of
type REAL
\;
Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to nil


Is this a Maxima bug or am I doing something wrong??
(I suspect the latter, since I am very new to Maxima.)

Grateful for any suggestions you can offer


P.S.: Maxima Version 5.9.1, CMUCL 19a on Mandrake Linux
(The versions from the sourceforge project page.)


		
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