ggbiplot - 更改磅值

Question

有人知道如何更改点大小并仍然在下面的代码中保持组颜色？

只需将geom_point(size = 8)所有点的颜色更改为黑色即可.

码:

library(ggbiplot)
data(wine)
wine.pca <- prcomp(wine, scale. = TRUE)
g <- ggbiplot(wine.pca, obs.scale = 1, var.scale = 1, 
              groups = wine.class, varname.size = 8, labels.size=10  , ellipse = TRUE, circle = TRUE)
g <- g + scale_color_discrete(name = '') #+  geom_point(size = 8)
g <- g + opts(legend.direction = 'horizontal', 
              legend.position = 'top')
print(g)

Answer 1

在内部添加颜色美感geom_point将使点按组着色.另外,我改opts到theme,既然opts已被弃用.

ggbiplot(wine.pca, obs.scale = 1, var.scale = 1, group=wine.class,
              varname.size = 8, labels.size=10, 
              ellipse = TRUE, circle = TRUE) +
  scale_color_discrete(name = '') +  
  geom_point(aes(colour=wine.class), size = 8) +
  theme(legend.direction ='horizontal', 
        legend.position = 'top')