Variable labels in the correlation matrix plot

Question

I would like to include the variables labels along with variable names in the correlation matrix plot.

Is there any way to do in R? my code:

library(corrplot)
corrplot(cor.mat, type="upper", order="hclust", 
         tl.col="black", tl.srt=45)

Thanks in advance.

Answer 1

You could try my package expss . Solution is not so perfect but helps me in many cases:

library(corrplot)
library(expss)

data(iris)
iris2 = iris[,-5] # drop 'Species' - factor variable

# apply labels
var_lab(iris2$Sepal.Length) = "Sepal Length"
var_lab(iris2$Sepal.Width) = "Sepal Width"
var_lab(iris2$Petal.Length) = "Petal Length"
var_lab(iris2$Petal.Width) = "Petal Width"

# for each variables add variable name to label 
for (each in colnames(iris2)){
    var_lab(iris2[[each]]) = paste(each, var_lab(iris2[[each]]))
}

# replace names with labels and build correlation matrix
cor.mat = cor(names2labels(iris2))

corrplot(cor.mat, type="upper", order="hclust", 
         tl.col="black", tl.srt=45)