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Add borders to the shapes in the PCA plot by using autoplot

Hi,

I was able to plot the PCA between two different variables using function autoplot() function from ggfortify library. I have a question about how to add the black borders around the circles and triangles as shown in the plot below. Please let me know if there any specific function for adding?

Thank you,

Toufiq

## PCA on two variables##
pca_v1 <- prcomp(Node, scale. = TRUE)
autoplot(pca_v1,
         data = Neg_Dct, colour = 'Category', shape = 'Response' , size = 3.5) +
  theme_classic()

ggfortify r pca autoplot ggplot2
• 4,204 views • link
updated by zx8754 zx8754 • written by mohammedtoufiq91 mohammedtoufiq91

Try this code and let us have your comments here:

autoplot(pca_v1, data = Neg_Dct, colour = 'Category', shape = 'Response' , size = 3.5) +
geom_point(shape = 1,size = 3.5,colour = "black") +
theme_classic()
• 0 views • link
written by cpad0112 cpad0112

1 answer

We can achieve the same using basic ggplot, see example:

library(ggplot2)

#example data
df1 <- data.frame(
  x = 1:10,
  y = 1:10,
  grp = rep(LETTERS[1:2], 5)
)

ggplot(df1, aes(x, y, col = "black", fill = grp, shape = grp)) +
  geom_point() +
  scale_color_identity() +
  scale_fill_manual(values = c("red", "green")) +
  scale_shape_manual(values = c(21, 24)) +
  theme_classic()

We need to use shapes that can have colour and fill separately: http://www.sthda.com/english/wiki/r-plot-pch-symbols-the-different-point-shapes-available-in-r

• 0 views • link
written by zx8754 zx8754

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