You guys are, of course, right. What probably threw me off was that
my gnuplot window did not show the values on the y-axis, Also, I do
not see anymore the feature from maxima-5.9.0 where you would move
the mouse over the plot window and read the coordinates of the
cursor position.
Sorry for the false alarm.
Milan
Camm Maguire [03/09/04 11:29 -0400]:
> Greetings! I believe the output is correct to within double floating
> point precision. I don't think that either version is explicitly
> simplifying the trigonometry to 0 (though I could be mistaken), so it
> is simply an issue that gnuplot autoscales the y axis, whereas the
> older native plotter doesn't seem to do so. The newer behavior (if
> described correctly above) would appear to be better.
>
> Take care,
>
> Milan Lukic <lmilan@shell.core.com> writes:
>
> > I attempted to verify graphically the following trig identity:
> >
> > sin(x) + cos(x) = sqrt(2)*cos(x-%pi/4);
> >
> > so I did:
> >
> > (%i1) sin(x)+cos(x)-sqrt(2)*cos(%pi/4-x);
> > -- skip the output --
> > (%i2)
> > plot2d(%o1,[x,0,2*%pi]);
> > I can send the eps file to anyone interested to see the weird
> > picture I got.
> >
> > Here is the result of build_info();
> >
> > Maxima version: 5.9.0.9beta2
> > Maxima build date: 14:27 8/11/2004
> > host type: i686-pc-linux-gnu
> > lisp-implementation-type: Kyoto Common Lisp
> > lisp-implementation-version: GCL 2.6.4
> >
> > *****
> > Maxima 5.9.0 produced a correct plot. Another observation, the plot
> > in maxima-5.9.0 came out quite quickly, while maxima-5.9.0.9beta2
> > took a long time to calculate and produce the plot.
> > "time(%o2)" shows [13.6].
> >
> > Milan
> >
> > _______________________________________________
> > Maxima mailing list
> > Maxima@www.math.utexas.edu
> > http://www.math.utexas.edu/mailman/listinfo/maxima
> >
> >
>
> --
> Camm Maguire camm@enhanced.com
> ==========================================================================
> "The earth is but one country, and mankind its citizens." -- Baha'u'llah