arlmet.Grid.fractional_indices# Grid.fractional_indices(lon, lat)[source]# Convert geographic coordinates to zero-based fractional grid indices. Parameters: lon (NDArray[Any] | float) – Geographic coordinates in degrees. lat (NDArray[Any] | float) – Geographic coordinates in degrees. Returns: Fractional (x, y) grid indices with the same broadcast shape as the input coordinates. Return type: tuple[NDArray[Any], NDArray[Any]]