forecastxgb-r-package
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forecasts with xreg with 1 period forward don't work
woolmod <- xgbar(woolyrnq, xreg = data.matrix(rep(1, length(woolyrnq))))
forecast(woolmod, xreg = data.matrix(rep(1, 2))) #works fine
forecast(woolmod, xreg = data.matrix(rep(1, 1))) #gives error