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`sincos()` creates a full set of seasonal trigonometric regressors (cos/sin harmonics) for a seasonal frequency.
sincos(Y, n.ahead = 0, constant = FALSE)
A `ts` matrix with trigonometric variables (and intercept if requested).
A seasonal `ts` object.
Integer. Extra observations to extend the sample.
Logical. If `TRUE`, include an intercept column.
X <- sincos(AirPassengers, constant = TRUE)
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