method : {‘linear’, ‘time’, ‘index’, ‘values’, ‘nearest’, ‘zero’,
‘slinear’, ‘quadratic’, ‘cubic’, ‘barycentric’, ‘krogh’, ‘polynomial’, ‘spline’, ‘piecewise_polynomial’, ‘from_derivatives’, ‘pchip’, ‘akima’}
- ‘linear’: ignore the index and treat the values as equally spaced. This is the only method supported on MultiIndexes. default
- ‘time’: interpolation works on daily and higher resolution data to interpolate given length of interval
- ‘index’, ‘values’: use the actual numerical values of the index
- ‘nearest’, ‘zero’, ‘slinear’, ‘quadratic’, ‘cubic’, ‘barycentric’, ‘polynomial’ is passed to
scipy.interpolate.interp1d. Both ‘polynomial’ and ‘spline’ require that you also specify an order (int), e.g. df.interpolate(method=’polynomial’, order=4). These use the actual numerical values of the index.- ‘krogh’, ‘piecewise_polynomial’, ‘spline’, ‘pchip’ and ‘akima’ are all wrappers around the scipy interpolation methods of similar names. These use the actual numerical values of the index. For more information on their behavior, see the scipy documentation and tutorial documentation
- ‘from_derivatives’ refers to BPoly.from_derivatives which replaces ‘piecewise_polynomial’ interpolation method in scipy 0.18
New in version 0.18.1: Added support for the ‘akima’ method Added interpolate method ‘from_derivatives’ which replaces ‘piecewise_polynomial’ in scipy 0.18; backwards-compatible with scipy < 0.18
axis : {0, 1}, default 0
- 0: fill column-by-column
- 1: fill row-by-row
limit : int, default None.
Maximum number of consecutive NaNs to fill. Must be greater than 0.
limit_direction : {‘forward’, ‘backward’, ‘both’}, default ‘forward’
If limit is specified, consecutive NaNs will be filled in this direction.
New in version 0.17.0.
inplace : bool, default False
Update the NDFrame in place if possible.
downcast : optional, ‘infer’ or None, defaults to None
Downcast dtypes if possible.
kwargs : keyword arguments to pass on to the interpolating function.
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