2008/2/7, Thomas Walter <[EMAIL PROTECTED]>:
> Hi everybody!
>
> I am trying to use the R-function princomp (or prcomp, I tried both, but
> I get the same error anyway) in order to apply principal component
> analysis to my data.
>
> Now, this works fine:
>
> let yoyoL be a list of lists :
>
> yoyoL = [ [0.0592, 0.0126, 0.08351, 0.01857, 0.02188], [ ... ], ... ]
> mat = r.matrix(r.unlist(yoyoL), nrow=5, byrow=True)
> pca = r.princomp(r.t(mat), cor=True)
>
> Okay, this works. But if I want to use the predict functionality of
> princomp, like:
> pred = r.predict(pca)
>
> I obtain the following error:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> rpy.RException: Error in UseMethod("predict") : no applicable method for
> "predict"
>
> Does anybody know how I could deal with this problem?
This is obviously a workaround but it will keep you going in the meanwhile:
p = r.get("predict.princomp", envir=r.getNamespace("stats"))(pca)
L.
> Thank you very much!
>
> Thomas.
>
>
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