# xarray.polyval

### xarray.polyval(coord, coeffs, degree_dim='degree')[[source]](https://github.com/pydata/xarray/blob/main/xarray/computation/computation.py#L859-L907)

Evaluate a polynomial at specific values

* **Parameters:**
  * **coord** ([`DataArray`](xarray.DataArray.html.md#xarray.DataArray) or [`Dataset`](xarray.Dataset.html.md#xarray.Dataset)) – Values at which to evaluate the polynomial.
  * **coeffs** ([`DataArray`](xarray.DataArray.html.md#xarray.DataArray) or [`Dataset`](xarray.Dataset.html.md#xarray.Dataset)) – Coefficients of the polynomial.
  * **degree_dim** (`Hashable`, *default*: `"degree"`) – Name of the polynomial degree dimension in coeffs.
* **Returns:**
  [`DataArray`](xarray.DataArray.html.md#xarray.DataArray) or [`Dataset`](xarray.Dataset.html.md#xarray.Dataset) – Evaluated polynomial.

#### SEE ALSO
[`xarray.DataArray.polyfit`](xarray.DataArray.polyfit.html.md#xarray.DataArray.polyfit), [`numpy.polynomial.polynomial.polyval`](https://numpy.org/doc/stable/reference/generated/numpy.polynomial.polynomial.polyval.html#numpy.polynomial.polynomial.polyval)