[Newbie] Plot problem (Feature suggestion)

Hello,
I'm not answering this question, but wondering if there's a need for a
special switch to turn on/off compilation of functions in quad_qagi-like
functions? When plot2d calls quad_qagi many many times it's slower to
compile-function each time than to use it 'as is'. At the beginning of
$quad_qagi there's (let* (... (f (compile nil (coerse-float-fun ...));
erasing this (compile ...) stuff speeds up plotting time. Maybe put a 
conditional there?

--
Andrei Zorine

Tim Day wrote:
 > If I execute the following:
 >
 >   NUMER:TRUE;
 >   REALONLY:TRUE;
 >   f(x,y):=1/(x^4+y^4);
 >   F(x):=quad_qagi(f(x,y),y,0,both)[1];
 >
 > Then querying F(1); F(2); etc outputs sensible numbers.
 > However, trying to get a graph of F:
 >
 >   plot2d(F(x),[x,-2,2]);
 >
 > fails with
 >
 >   Error in FUNCALL [or a callee]: ((MEXPT SIMP)
 >                                   ((MPLUS SIMP) 1.0
 >                                    ((MEXPT SIMP) |$x| 4))
 >                                   -1) is not of type (OR RATIONAL
 >                                                       LISP:FLOAT).
 >
 > I have a vague idea the solution involves dropping a "'" in the right
 > place, or inserting some MODE_DECLAREs or using FLOATDEFUNK.  However,
 > I've completely failed to get anywhere with either of them.  What's the
 > trick ?
 >
 > [I'm using maxima 5.9.1 on Debian Sarge.  Things like:
 > plot2d(sin(x),[x,-%pi,%pi]);
 > work fine, coming up in gnuplot.]
 >
 > Thanks for any help
 > Tim
 >
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 >