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reflect
2011 Aug 09
2
reflecting a PCA biplot
...ies coordinates and I have worked out how to multiply the
appropriate PC1 scores by -1 to create the site and species scores I want.
However I am not sure how to change the call to plot which accesses the
results of the call to rda to draw the blank plot. The coordinates it is
accessing are for the unreflected ordination and this does not match the new
site and species scores that I have.
> fish.pca <- rda(fish.hel)
> fish.site <- scores(fish.pca,display="sites",scaling=3)
> fish.spp <- scores(fish.pca,display="species",scaling=3)
> fish.site[,"PC1"...