On 2014-04-15 12:10-0600 Derek Lamb wrote: > plshades is too slow for just about every imaginable real-world application, > as far as I've been able to tell. If memory serves correctly, even if you > output to a PDF and open in your favorite reader, it will render incredibly > slowly. Inefficiencies in the way the color tables are calculated, I think. > > So, this isn't really helpful, but I thought I'd let you know it's not just > you. > > http://sourceforge.net/p/plplot/bugs/105/
The current implementation of plshades is grossly inefficient since it calls a plshade variant (which processes the entire x, y plane to find regions having the appropriate shade range and then fills those regions with a single colour) for each member of a set of contiguous shade ranges. So the timing scales as nX*nY*nS, where nX is the number of X points, nY is the number of Y points, and nS is the number of (contiguous) shade ranges = number of times plshade is called. We would welcome a patch that reimplemented plshades in a much more efficient manner (say with timing that scaled as nX*nY). @Tom: until someone does that, I suggest you survey the other PLplot methods of displaying 3D functions, i.e., plmesh*, pl[f]surf*, plot3d*, or plcont for speed. If some/all of those have the necessary speed for real-time plotting, then that speed is something that should be aimed for if/when there is a new plshades implementation. 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); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.sf.net); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech _______________________________________________ Plplot-general mailing list Plplot-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-general
