plot2d(1/x,[x,0,1],[y,0,5]); => division by 0

>>>>> "Felix" == Felix E Klee <felix.klee.maxima@gmx.net> writes:

    Felix> On Thursday 17 April 2003 19:05, Raymond Toy wrote:
    >> plot2d(1/(x-0.5),[x,0,1]) should demonstrate this, but the adaptive
    >> plotting is taking forever to compute the points.  It's slowly moving
    >> towards 0.5.
    >> 
    >> I think we really need a way to turn off adaptive plotting.

    Felix> Oh yes, this seems to illustrate another problem I had recently: plot2d 
    Felix> seems to take forever. I just tried your example and let it run for some 
    Felix> time. On my machine (Celeron 550, 192 MB RAM, LINUX) it aborts with the 
    Felix> following error message:

We should also make plotting a little smarter.  There's no point in
letting the x step size drop infinitesimally small.

    Felix>     Error: The storage for LONG-FLOAT is exhausted.
    Felix>            Currently, 24667 pages are allocated.
    Felix>            Use ALLOCATE to expand the space.
    Felix>     Fast links are on: do (si::use-fast-links nil) for debugging
    Felix>     Error signalled by CATCH.
    Felix>     Broken at MACSYMA-TOP-LEVEL.  Type :H for Help.
    MAXIMA> 

    Felix> What exactly is adaptive plotting? I couldn't find anything about it in the 
    Felix> Info pages.

Right now, if the change in y is too large, the x step size is
decreased.  This keeps happening until the change in y is less than
the original x step size (I think).

Ray