Ilya Zakharevich on Mon, 20 Apr 1998 06:01:15 +0200 |
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Recursive plotting |
Of course, after I finished debugging a Math::Pari Perl script which was auto-refining set of points so that they (the points) give a good graph of the given function if used with cubic splines, I discovered this RECURSIVE flag for ploth(). ;-) Couple of notes: a) Documentation says that PARI uses min 15 points for graphing, but analysis of the code says that it is 29 points. Since 15 looks like a right value, one need to change RECUR_NUMPOINTS to 8, so that PARI uses 15 points min. b) I think it is not yet late to change the meaning of flag 2 on the opposite : if it is set, PARI will not use heuristics to speed up plotting. One should value backward-compatibility, but with plotting precision does not come first. I still need more than 5 mins to plot zeta on the interval of length 3 near 0.5+3000i, and with such speed the time becomes a primary factor. Ilya