Re: [NTG-context] metafun 2

```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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