如何在图形中放置colorlegend(corrplot) [英] how to place colorlegend (corrplot) in graphic

问题描述

我正在使用corrplot创建关联热图，但是我不喜欢默认图例-它太大.因此，在创建绘图后，我试图使用colorlegend()添加图例(并使用cl.pos="n"禁用默认图例).

I am using corrplot to create a correlation heatmap, but I don't like the default legend - it is too big. So I was trying to use the colorlegend() to add the legend after I create the plot (and disable the default legend with cl.pos="n").

唯一的问题是我不知道如何更改图例的位置-它的结尾位于左下角.理想情况下，我可以将其放在右上角，但是我浏览了colorlegend的选项并进行了绘制，因此无法弄清楚.

Only problem is that I can't figure out how to change the position of the legend - it ends up on the lower left. Ideally, I could place it on the top right, but I looked through the options for colorlegend and plot and can't figure this out.

例如:

# load libraries and create color scale
library(corrplot)
library(RColorBrewer)
scalebluered <- colorRampPalette(brewer.pal(8, "RdBu"))(8)

# get data into correlation matrix
data(mtcars)
cars.matrix <- as.matrix(mtcars[c(2:8)])
cars.corr <- cor(cars.matrix)

# plot it
corrplot(cars.corr, method="shade", shade.col=NA, tl.col="black", 
         tl.srt=45, addgrid.col="black", type="lower", diag=FALSE, cl.pos="n")

# add legend
colorlegend(scalebluered, c(seq(-1,1,.25)), align="l", vertical=TRUE, addlabels=TRUE)

输出: http://i42.tinypic.com/14wsqc0.png

推荐答案

几个月后，我再次进行了讨论并弄清楚了..只需添加xlim和ylim即可定义图例的尺寸.

Months later, I revisit this and figure it out.. just add xlim and ylim to define the dimensions of the legend.. super easy!

colorlegend(xlim=c(10,15), ylim=c(10,15), scalebluered, c(seq(-1,1,.25)), align="l", vertical=TRUE, addlabels=TRUE)

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