[R] Save figure in pdf

[Komine]

Hi, 

I created a figure with R and I want to save it in .pdf. I used this code:
> pdf("res.pca.pdf",width=10,height=8)
> library(FactoMineR)
> res.pca<-PCA(acp)
> res.pca
> dev.off()

When I go in my folder, I find an empty file ( 0 Ko). 
Do you know where is the problem. 

Thank you in advance  


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