I concur that it is just a moiré pattern and issues from sampling. Once you get sufficiently far from the origin, the interval of r for frac(r^2) = (0,1) gets very small (in fact, very quickly). Contrast this with
f(x,y) = frac(sqrt(x^2+y^2)) It comes down to the sampling being done to make the 2d image. Best, Travis On Thursday, February 27, 2025 at 1:14:34 AM UTC+9 Georgi Guninski wrote: > Thanks for the plots. > Are you sure that the example with implicit_plot and plot_points=800 > doesn't have patterns? > I suspect that precision issues (float?) together with small "pixel" > size incorrectly kill the pattern. > > implicit_plot(lambda u, v:frac(u^2+v^2)-0.5, (13, 14), (13, 14), > plot_points=800) > shows lines, not sure if this is correct. > I think if you increase the number of points you must zoom in, > decreasing the size of the region. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/sage-devel/e9e811bb-5d4f-4fd4-8979-a6ad6178791bn%40googlegroups.com.
