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Build the training examples for a regressive model to forecast a time series using lagged values of the series as autoregressive features.
build_examples(timeS, lags)
A list with two fields: 1) a matrix with the features of the examples and 2) a vector with the targets of the examples
The time series.
An integer vector with the lags used as feature vector in decreasing order.
build_examples(ts(1:5), lags = 2:1)
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