dplyr安排不工作

Question

参考问题，Order color based on Hue, Saturation, Value in R

我有以下数据，我希望基于h，然后s，最后是v进行排序。

> library(dplyr)
> tHSVcol
             h         s         v
[1,] 0.6229508 0.6421053 0.3725490
[2,] 0.2767296 0.5145631 0.8078431
[3,] 0.1323283 0.7928287 0.9843137
[4,] 0.9790476 0.9510870 0.7215686
[5,] 0.9093567 0.5480769 0.4078431

当我执行tHSVcol %>% arrange(desc(h))时，我得到

Error in UseMethod("arrange_") : no applicable method for 'arrange_' applied to an object of class "c('matrix', 'double', 'numeric')"

我做错了什么？

Answer 1

假设您的矩阵称为m，您可以这样做：

m[order(m[,"h"], decreasing = T), ]

#             h         s         v
#[1,] 0.9790476 0.9510870 0.7215686
#[2,] 0.9093567 0.5480769 0.4078431
#[3,] 0.6229508 0.6421053 0.3725490
#[4,] 0.2767296 0.5145631 0.8078431
#[5,] 0.1323283 0.7928287 0.9843137