你如何重新排列 R 中的向量顺序？

Question

我在 xts R 对象中有三个向量。称它们为 V1、V2、V3。合并后，从左到右依次为V2、V3、V1。我如何重新排列它们，使它们（从左到右）读为 V1、V2、V3？

Answer 1

您可以只引用列并重新分配它们：

 x <- x[,c(2,3,1)]

这是一个工作示例：

> data(sample_matrix)
> x <- head(as.xts(sample_matrix, descr='my new xts object'))[,c(1,2,3)]
> x
               Open     High      Low
2007-01-02 50.03978 50.11778 49.95041
2007-01-03 50.23050 50.42188 50.23050
2007-01-04 50.42096 50.42096 50.26414
2007-01-05 50.37347 50.37347 50.22103
2007-01-06 50.24433 50.24433 50.11121
2007-01-07 50.13211 50.21561 49.99185
> x <- x[,c(2,3,1)]
> x
               High      Low     Open
2007-01-02 50.11778 49.95041 50.03978
2007-01-03 50.42188 50.23050 50.23050
2007-01-04 50.42096 50.26414 50.42096
2007-01-05 50.37347 50.22103 50.37347
2007-01-06 50.24433 50.11121 50.24433
2007-01-07 50.21561 49.99185 50.13211