R 阴谋的奇怪行为

使用以下R代码和软件包

corrplot

：

library(corrplot)
M <- cor(mtcars)
diag(M) <- 0
dev.new()
corrplot(M, is.corr=F, method = "circle", col=colorRampPalette(c("blue","white","goldenrod"))(256), cl.lim=c(-0.87, 0.91))

L <- M/2
dev.new()
corrplot(L, is.corr=F, method = "circle", col=colorRampPalette(c("blue","white","goldenrod"))(256), cl.lim=c(-0.87, 0.91))

库（corrplot）
M
N <- abs(L)
dev.new()
corrplot(N, is.corr=F, method = "circle", col=colorRampPalette(c("blue","white","goldenrod"))(256), cl.lim=c(-0.87, 0.91))