This is not reproducible (see for example [1]), so it is very difficult to know
exactly what the problem is. Also, you need to post on this list using the
plain text format option in your email software, since the HTML format you used
can mess up your code.
I can say that using "[" indexing on a data frame will give you back a data
frame as long as you have multiple result columns, and cbind converts that to a
matrix. Since data frames typically have columns of a variety of types
("storage modes") while matrices do not, you are likely damaging your data
frames every time you use cbind. I recommend that you interactively execute
(e.g. using copy/paste) one line at a time in your script and use the str()
function after each line to learn the structure of the the objects you are
creating and modifying.
The best way to make a data frame from vector is:
test <- data.frame( BSUPred, PressurePred )
or
test <- data.frame( BSUPred=BSUPred, PressurePred=PressurePred )
A couple of ways to add columns to data frames that don't damage the data frame
are:
test$Placer <- i
or (an example where specifying only one column identifies a vector rather than
the usual data frame result)
test[ , "Placer" ] <- i
or even (not recommended for efficiency reasons):
test <- data.frame( test, Placer=i )
If this is not enough help, make your example reproducible using the advice in
[1] and try posting again.
[1]
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example
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On November 2, 2014 3:19:45 AM PST, TJUN KIAT TEO <teotj...@hotmail.com> wrote:
>This is my code
>
> BSUPred<-(forecast(BSU,h=h)[[2]])
> PressurePred<-(forecast(Pressure,h=h)[[2]])
> Placer<-(rep(1,h))
> test<-as.data.frame(cbind(BSUPred,PressurePred))
> test$Placer<-rep(1:2,h/12)
> test$Placer<-i
> test<-as.data.frame((test[c("Placer","BSUPred","PressurePred")]))
> resp<-predict(fit,newdata=test,type="response")
> Pred<-ifelse((predict(fit,newdata=test,type="response")>0.5),1,0)
>
>But I get this error message
>
>Error in model.frame.default(Terms, newdata, na.action = na.action,
>xlev = object$xlevels) :
> variable lengths differ (found for 'Placer')
>
>Can anyone help?
>
>Thanks
>
>Tjun Kiat
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>R-help@r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
