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rr-corrplot

R package corrplot - headmap color and lower triangular variable names

I have two questions concerning the package corrplot:

1) How do I make the colors of the headmap contrast more? Everything in the range from -0.2 to 0.2 is hardly visible.

2) I want just half of the correlation matrix. If I change the type to "lower" the variable names come down. However I still want them to be up, like a regular rectangle.

Attached as screenshot.

Solution

  • 1) In the documentation of corrplot there are several examples of how to change color scales. It's easy to create your own color scales. Here's just one possible example: 

    require(corrplot)
data(mtcars)
M <- cor(mtcars)
col <- colorRampPalette(c("red", "blue"))
corrplot(M, col = col(10))

    2) You can easily change the position of the labels and the color scale using the arguments tl.pos and cl.pos respectively. For example: 

    corrplot(M, col = col(10), type = "lower", cl.pos = "r", tl.pos = "lt")