On 2009-08-27 09:05+0200 Werner Smekal wrote:

> * example 16 has wrong colors. The following warning messages are print to 
> the screen:
>
> *** PLPLOT WARNING ***
> Unrecognized cmap1 format 0.0   1.0   1.0   1.0   1.0 0
>
> *** PLPLOT WARNING ***
> Unrecognized cmap1 format 0. 240. 0.5 1.0 1. 0
>
> *** PLPLOT WARNING ***
> Unrecognized cmap1 format 0.0   0.0   0.0   0.0   1.0 0

These warnings are evidence of more floating-point comparison issues that
ocurred in plspal1 which I should have spotted when I fixed a similar issue
that Valery Pipin found for cmap1_default.cmap.

I believe I have now solved all these plspal1 floating-point comparison
issues completely using a macro for the needed and oft-used programme
fragment to deal with such issues (revision 10353).  Also, I have made a
much better fallback (gray scale rather than segfault) when the requested
cmap1 palette file is completely wrong. Could you try again, please, to see
if the above warnings are gone?

Out of curiosity, what hardware were you using when you ran into the above
warnings?  I suspect it wasn't Intel/AMD. (That hardware uses 80-bit rather
than 64-bit registers to store intermediate floating-point results.  That
leads to higher than normal floating-point precision and fewer
floating-point comparison issues.  The downside is that if you test
exclusively on Intel/AMD, you may not notice the effects of problematic code
which is subject to floating-point comparison issues.)

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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