Transformer
ColumnConcatenator
Concatenate multivariate series to a long univariate series.
Transformer that concatenates multivariate time series/panel data into single univariate time series/panel data by concatenating each individual series on top of each other from left to right.
Uses pandas method stack() to do the concatenating
Quickstart
python
from sktime.transformations.colconcat import ColumnConcatenator
estimator = ColumnConcatenatorExamples
>>> from sktime.transformations.colconcat import ColumnConcatenator # noqa: E501
>>> import numpy as np
>>> data = np. array ([[1, 2, 3 ],
... [4, 5, 6 ],
... [7, 8, 9 ]])
>>> concatenator = ColumnConcatenator ()
>>> concatenator. fit_transform (data) array([[1.], [4.], [7.], [2.], [5.], [8.], [3.], [6.], [9.]]) Another example with panel data.
>>> from sktime.utils._testing.panel import _make_panel
>>> panel_data = _make_panel (
... n_columns = 2,
... n_instances = 2,
... n_timepoints = 3,
... )
>>> panel_data = concatenator. fit_transform (panel_data)