Hi, I wrote a PCA script to project my samples using chatgpt, which may not be appropriate! I have a PCA plot, which is great.

Now I want to get circles for three replicates on the PCA plot, and how do I colour them differently based on the individuals? (I am not able to use chatgpt in this scenario!)

Could you possibly assist me in improving the script line that begins with 'barplot' and 'plot' to produce a blue barplot and PCA with a circle of individuals? the script I use is below-

data <- read.csv("For mesophyll and epidermis f 211223.csv", row.names = 1)  # Assuming gene IDs are in the first column
data <- t(data)

library (FactoMineR)
head(data)
PCA(na.omit(data))

library(factoextra)
library(ggplot2)
summary(data)

res.pca <- PCA(data, scale.unit=TRUE, graph=F)

eigenvalues <- res.pca$eig
res.pca <- PCA(data,quali.sup=c(1))
head(res.pca$eig)
barplot(res.pca$eig[,2],main="Eigenvalues",names.arg=1:nrow(res.pca$eig)) #Can you plz improve this line?

#Correlation circle
head(res.pca$ind$coord)
plot(res.pca,choix = "var")

#to get the dotplot
plot(res.pca, choix = "ind", invisible = "quali") #Can you plz improve here to have circles for replicates coming from same sample?