[R] PCA bibplot

[Jackson Rodrigues]

Hi everybody,

I am using vegan package.
I have a matrix with 72 plant species, however most of them are irrelevant
or not very important. When they are displayed together my plot is
cluttered.So I want to constrain my biplot showing only species A B C D.
How can I write the right code?

I am trying the following code.

mydata.pca<-rda(mydata)
biplot(mydata.pca, scaling=-3)

best,

Jackson

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