How to use corrplot with simple matrices

Question

I have a simple 8 by 8 matrix

M <- matrix(rnorm(64), nrow=8, ncol=8) 

How should I transform it to plot it with library(corrplot)? Without transformation the error is:

corrplot.mixed(M)

Error in corrplot(corr, type = "upper", method = upper, diag = TRUE, tl.pos = tl.pos, : The matrix is not in [-1, 1]! which I guess would assume that the matrix should be [-1, 1]?

Infernal

Answer 1

Just indicate that it is not a correlation matrix:

library(corrplot)
corrplot(M, is.corr = FALSE, method = "square")

Bennion

What if it is a correlation matrix? – Electroshock

Then you can do: corrplot(cor(M)). This will use a correlation matrix for the M matrix (with pearson method as default). – Workhouse