由于某些原因我不明白，当我运行as.xts从具有rownames中的日期的矩阵转换时，此操作将最终生成日期时间。由于这与启动索引不同，merge / cbinds将不起作用。 有人能指出我做错了什么吗？
> class(x)
[1] "xts" "zoo"
> head(x)
XLY.Adjusted XLP.Adjusted XLE.Adjusted AGG.Adjusted IVV.Adjusted
2005-07-31 0.042255791 0.017219585 0.17841600 0.010806168 0.04960026
2005-08-31 0.034117087 0.009951766 0.18476766 0.015245222 0.03825968
2005-09-30 -0.029594066 0.008697349 0.22851906 0.009769765 0.02944754
2005-10-31 -0.015653740 0.019966664 0.09314327 -0.012705172 0.01640395
2005-11-30 -0.005593003 0.005932542 0.05437377 -0.005209811 0.03173972
2005-12-31 0.005084193 0.021293537 0.05672958 0.002592639 0.04045477
> head(index(x))
[1] "2005-07-31" "2005-08-31" "2005-09-30" "2005-10-31" "2005-11-30" "2005-12-31"
> temp=t(apply(-x, 1, rank, na.last = "keep"))
> class(temp)
[1] "matrix"
> head(temp)
XLY.Adjusted XLP.Adjusted XLE.Adjusted AGG.Adjusted IVV.Adjusted
2005-07-31 3 4 1 5 2
2005-08-31 3 5 1 4 2
2005-09-30 5 4 1 3 2
2005-10-31 5 2 1 4 3
2005-11-30 5 3 1 4 2
2005-12-31 4 3 1 5 2
> head(rownames(temp))
[1] "2005-07-31" "2005-08-31" "2005-09-30" "2005-10-31" "2005-11-30" "2005-12-31"
> y=as.xts(temp)
> class(y)
[1] "xts" "zoo"
> head(y)
XLY.Adjusted XLP.Adjusted XLE.Adjusted AGG.Adjusted IVV.Adjusted
2005-07-31 3 4 1 5 2
2005-08-31 3 5 1 4 2
2005-09-30 5 4 1 3 2
2005-10-31 5 2 1 4 3
2005-11-30 5 3 1 4 2
2005-12-31 4 3 1 5 2
> head(index(y))
[1] "2005-07-31 BST" "2005-08-31 BST" "2005-09-30 BST" "2005-10-31 GMT" "2005-11-30 GMT" "2005-12-31 GMT"
答案 0 :(得分：2)
as.xts.matrix的{{1}}参数默认为dateFormat，因此它假设矩阵的rownames是日期时间。如果您希望它们只是日期，请在"POSIXct"来电中指定dateFormat="Date"。
as.xts