search for: myncol

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2013 Mar 22
0
predict.Arima error "'xreg' and 'newxreg' have different numbers of columns"
...] <- predict(fit, newxreg=indep, n.ahead = 1) } However, I got the error message as 'xreg' and 'newxreg' have different numbers of columns". So I debug into predict.Arima (as shown in (*)). (*): debugging in: predict.Arima(fit, newxreg = indep, n.ahead = 1) debug: { myNCOL <- function(x) if (is.null(x)) 0 else NCOL(x) rsd <- object$residuals xr <- object$call$xreg xreg <- if (!is.null(xr)) eval.parent(xr) else NULL ncxreg <- myNCOL(xreg) if (myNCOL(newxreg) != ncxreg) stop("'xreg' and ...
2010 Mar 31
1
predict.Arima: warnings from xreg magic
...hink this is because I'm not running predict.Arima in the same environment that I did the fit, so the data object used in the fit is no longer present. Looking at the predict.Arima source, predict.Arima <- function (object, n.ahead = 1, newxreg = NULL, se.fit = TRUE, ...) { myNCOL <- function(x) if (is.null(x)) 0 else NCOL(x) rsd <- object$residuals xr <- object$call$xreg xreg <- if (!is.null(xr)) eval.parent(xr) else NULL ncxreg <- myNCOL(xreg) if (myNCOL(newxreg) != ncxreg) stop("'xreg' and 'newxreg...
2009 Feb 17
0
What's the predict procedure of ARIMA in R?
...commands and get the original code of the "predict" command, but I can't read it. Can anybody explain it to me? Thanks! saji from Shanghai the code: > getS3method("predict","Arima") function (object, n.ahead = 1, newxreg = NULL, se.fit = TRUE, ...) { myNCOL <- function(x) if (is.null(x)) 0 else NCOL(x) rsd <- object$residuals xr <- object$call$xreg xreg <- if (!is.null(xr)) eval.parent(xr) else NULL ncxreg <- myNCOL(xreg) if (myNCOL(newxreg) != ncxreg) stop("'xreg' and...