Question

有人知道如何更改磅值并仍然在下面的代码中保持组颜色吗？

只需添加geom_point(size = 8)即可将所有点的颜色更改为黑色。

代码：

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geom_point内添加颜色美学将使点按组着色。此外，我将opts更改为theme，因为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')

Answer 2

我试图让我的分数更小时遇到了这个问题。 eipi10的答案很好地通过简单地绘制默认值来使点更大来解决这个问题点。虽然这是一个有效的简单解决方案，但我可以提出以下建议，通过设置alpha=0并绘制上述geom_point行中的点来使默认点不可见：

ggbiplot(wine.pca, obs.scale = 1, var.scale = 1, group=wine.class,
     varname.size = 8, labels.size=10, 
     ellipse = TRUE, circle = TRUE,
     alpha=0 #here's the change
) + 
scale_color_discrete(name = '') +  
geom_point(aes(colour=wine.class), size = 0.5) +  #set size of smaller points here
theme(legend.direction ='horizontal', 
    legend.position = 'top')

ggbiplot - 更改磅值

2 个答案: