[R] the predict.lda function

[Gavin Simpson]

On Mon, 2010-03-01 at 16:55 -0500, Diana Connett wrote:
> Hello.
> I just downloaded R onto a new computer, and after entering library(MASS), I
> still get the message "Error: could not find function "predict.lda"" when I try
> to use the predict.lda function (even just "predict.lda()")
> 
> Can anyone help me out?

Stop calling it directly, use the generic predict() instead. The reason
predict.lda can't be found is that it is hidden in a package NAMESPACE:

> require("MASS")
Loading required package: MASS
> predict.lda()
Error: could not find function "predict.lda"
> methods(predict)
 [1] predict.ar*                predict.Arima*            
 [3] predict.arima0*            predict.glm               
 [5] predict.glmmPQL*           predict.HoltWinters*      
 [7] predict.lda*               predict.lm                
 [9] predict.loess*             predict.lqs*              
[11] predict.mca*               predict.mlm               
[13] predict.nls*               predict.polr*             
[15] predict.poly               predict.ppr*              
[17] predict.prcomp*            predict.princomp*         
[19] predict.qda*               predict.rlm*              
[21] predict.smooth.spline*     predict.smooth.spline.fit*
[23] predict.StructTS*         

   Non-visible functions are asterisked

By calling things directly you aren't really using R the way the
developers want you to. You should not need to know that there are all
those predict methods and what their names are etc. You should just need
to check that there is a method for the object/code you are using and
then call the generic function whilst R takes care of everything else.

If you *must* call it directly:

MASS:::predict.lda()

See ?`:::`

HTH

G

> Thank you!
> 
> Diana Connett
> 
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