Documentation on parametric plot

[q-wertz]

Hello,

in the docs it is mentioned that one can do parametric plots

Array of 2D data points (numeric) or a function of the form x => y, where x is a value in domain
and y must be numeric or a 2D vector (for parametric functions).

I didn't find an example and failed to create one...

My goal is to plot a hyperbola. A very boiled down example

#import "@preview/cetz:0.3.2"
#import "@preview/cetz-plot:0.1.1": plot


#cetz.canvas({
  import cetz.draw: *

  plot.plot(
    size: (2, 2),
    // axis-style: none,
    {
      plot.add((calc.cosh, calc.sinh))
    },
  )

})

Fails with

function `cosh` does not contain field `at`

I also would like to set the parameters e.g. plot.add((13*calc.cosh, 11*calc.sinh)) but then I also get the error cannot multiply integer with function

Maybe I also do some very basic typst errors 😅

[johannes-wolf]

You have to pass a function that takes a single parameter. Use Typst lambda functions like this:

#import "@preview/cetz:0.3.2"
#import "@preview/cetz-plot:0.1.1": plot

#cetz.canvas({
  import cetz.draw: *

  plot.plot(
    size: (5, 5),
    // axis-style: none,
    {
      plot.add(domain: (-1, 1), t => (calc.cosh(t), calc.sinh(t)))
    },
  )
})

[q-wertz]

Thanks a lot for your help 😊

I just naively tried to extrapolate the usage from the given example.

This would be awesome to have in the documentation (if it is not yet and I just didn't see it).