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2005 Mar 24
1
RE: [R] Mapping actual to expected columns for princomp object
[Re-directing to R-devel, as I think this needs changes to the code.]
Can I suggest a modification to stats:predict.princomp so that it will check
for column (variable) names?
In src/library/stats/R/princomp-add.R, insert the following after line 4:
if (!is.null(cn <- names(object$center))) newdata <- newdata[, cn]
Now Dana's example looks like:
> predict(pca1, frz)
Error in
2005 Mar 24
0
Mapping actual to expected columns for princomp object
I am working with data sets in which the number and order of columns
may vary, but each column is uniquely identified by its name. E.g.,
one data set might have columns
MW logP Num_Rings Num_H_Donors
while another has columns
Num_Rings Num_Atoms Num_H_Donors logP MW
I would like to be able to perform a principal component analysis (PCA)
on one data set and save the PCA object to