biplot<-ggbiplot(pcobj = PCA,choices= c(1,2),scale = 1,groups = Fdata$Tissue,ellipse = TRUE)
geom_vline(xintercept = 0, linetype = 3) geom_hline(yintercept = 0, linetype = 3)
uj5u.com熱心網友回復：
嘗試添加geom_point(aes(shape=factor(something)))。以iris資料為例，
library(ggbiplot)
ir.pca <- prcomp(iris[,1:4], center = TRUE,scale. = TRUE)
ggbiplot(ir.pca, obs.scale = 1, var.scale = 1,groups = iris$Species, ellipse = TRUE) geom_point(aes(shape=factor(iris$Species)))
ggbiplot(ir.pca, obs.scale = 1, var.scale = 1,groups = iris$Species, ellipse = TRUE, labels = )
geom_point(aes(shape=factor(iris$Species)))
guides(color = "none", shape = guide_legend(title = "New"))
scale_shape_discrete(labels = c("a", "b", "c"))
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