R 绘制颜色由一系列值给定的数据点
我有下面的矩阵R 绘制颜色由一系列值给定的数据点,r,plot,R,Plot,我有下面的矩阵 > mdat <- matrix(c(0.25,0.45,0.3, 0.75,0.15,0.62,0.40,0.90,1, 0.45,0.15,0), nrow = 4, ncol = +3, byrow = TRUE) > mdat [,1] [,2] [,3] [1,] 0.25 0.45 0.30 [2,] 0.75 0.15 0.62 [3,] 0.40 0.90 1.00 [4,] 0.45 0.15 0.00 >mdat-mdat [,1
> mdat <- matrix(c(0.25,0.45,0.3, 0.75,0.15,0.62,0.40,0.90,1, 0.45,0.15,0), nrow = 4, ncol = +3, byrow = TRUE)
> mdat
[,1] [,2] [,3]
[1,] 0.25 0.45 0.30
[2,] 0.75 0.15 0.62
[3,] 0.40 0.90 1.00
[4,] 0.45 0.15 0.00
>mdat-mdat
[,1] [,2] [,3]
[1,] 0.25 0.45 0.30
[2,] 0.75 0.15 0.62
[3,] 0.40 0.90 1.00
[4,] 0.45 0.15 0.00
我需要用pch=22(正方形)来绘制它,但是正方形应该根据以下内容着色:如果数据点位于(0.0,0.25)中,则为红色 橙色,如果数据点位于(0.26,0.50) 如果数据点为蓝色(0.51,0.75)
如果(0.76,1.00)中的数据点为绿色,则使用
findInterval
生成用于从颜色值向量中拾取颜色的索引:
plot(rep(1:4, 3), mdat, pch=22,
col=c("red","orange","blue")[findInterval(mdat, c(0,.25,.5,.75))])