> For the complete documentation index, see [llms.txt](https://doc.open-tx.org/opentx-2-3-lua-reference-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.open-tx.org/opentx-2-3-lua-reference-guide/part_iii_-_opentx_lua_api_reference/model-functions-less-than-greater-than-luadoc-begin-model/setcurve.md).

# model.setCurve(curve, params)

Set Curve parameters

The first and last x value must -100 and 100 and x values must be monotonically increasing

@status current Introduced in 2.2.0

Example setting a 4-point custom curve:

```lua
  params = {}
  params["x"] =  {-100, -34, 77, 100}
  params["y"] = {-70, 20, -89, -100}
  params["smooth"] = true
  params["type"] = 1
  val =  model.setCurve(2, params)
```

setting a 6-point standard smoothed curve

```lua
val = model.setCurve(3, {smooth=true, y={-100, -50, 0, 50, 100, 80}})
```

## Parameters

* `curve` (unsigned number) curve number (use 0 for Curve1)
* `params` see model.getCurve return format for table format. setCurve uses standard lua array indexing and arrays start at index 1

## Return value

* `curve` status data:
  * 0 - Everything okay
  * 1 - Wrong number of points
  * 2 - Invalid Curve number
  * 3 - Cuve does not fit anymore
  * 4 - point of out of index
  * 5 - x value not monotonically increasing
  * 6 - y value not in range \[-100;100]
  * 7 - extra values for y are set
  * 8 - extra values for x are set