Hi, I am trying to plot some elliptic curves with CeTZ, here is my code so far:

```
#import "@preview/cetz:0.3.1"
#import "@preview/cetz-plot:0.1.0": plot, chart
#let EC_func(x) = {
let y = x*x*x - 4*x + 6
if y < 0 {
return 0
}
return calc.sqrt(y)
}
#let EC_drawing = cetz.canvas({
plot.plot(
size: (10, 10),
x-tick-step: 5,
y-tick-step: 20,
x-min: -5,
max: 10,
x-grid: true,
y-grid: true,
{
plot.add(domain: (-5, 10), EC_func)
plot.add(domain: (-5, 10), t => (t, -EC_func(t)))
})
})
#EC_drawing
```

Obviously, it’s not perfect. There are 2 things I haven’t figured out how to do:

- when I plot the function, there are some x-values not in the domain (which now get set to 0, see the “beak” on the left). Is there a way to ignore these points? In the example above, these would be points <= 2.5 so I could just set
`domain: (-2.5, 10)`

, but this way gets annoying quick if I want to plot multiple curves, doubly so if they are disconnected in the middle - Less importantly, is there an easy way to plot both the positive and negative side? Of course I can do it like I did and manually set the color for both, but if there’s an easier way that’d be great

Thanks!