[NTG-context] metafun 2
Hans Hagen
j.hagen at xs4all.nl
Wed Aug 14 16:49:05 CEST 2019
On 8/14/2019 4:22 PM, Otared Kavian wrote:
> Hi Hans,
>
> Thank you very much for the new features! I haven't yet read all the mag-1104-mkiv.pdf where you explain some of them, but after modifying one of your examples, I noticed that some funtions get a strange graph, which is probably due to the fact that metafun2 is interpolating between points in a way which is not correct.
> For instance, in the following example (which is a slight modification of yours), the curve drawn is not a graph, in the sense that for some values of x it seems to be two or more values of y.
>
> How does metafun 2 traces the curve between two discretization points?
it doesn't, it just connects the dots, so, just use a smaller step, like
xstep = .01
(The upcoming luagraph module will provide some interpolators so at some
point we can hook these in.)
(btw, there are a lot of extra math functions, also or complex numbers)
> Best regards: OK
>
> %%% begin draw-2.tex
>
> \starttext
> \startMPcode{doublefun}
> draw lmt_function [
> xmin = 1.0, xmax = 2.5066283, xstep = .1,
> ymin = -2, ymax = 2,
> % xticks = "bottom", xsmall = 80, xlarge = 20,
> % yticks = "left", ysmall = 40, ylarge = 4,
> code = "1.5 * math.sin(2*x^2)",
> xlabels = "yes",
> ylabels = "yes",
> ycaption = "\strut\tfd \rotate[rotation=90]{vertical}",
> xcaption = "\strut\tfd horizontal",
> pointsymbol = "dot", pointsize = 4, pointcolor = "orange",
> sx = 2mm, sy = 4mm, linewidth = .025mm, offset = .1mm,
> ]
> xsized 8cm ;
> \stopMPcode
>
> \stoptext
>
> %%% end draw-2.tex
Hans
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Hans Hagen | PRAGMA ADE
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