I understand Josh's example:

mat <- matrix(1:10, dimnames = list(NULL, "A"))
cbind(X = 11:20, Y = mat + 1)
cbind(X = 11:20, Y = mat[, "A"] + 1)


In the line, cbind(X = 11:20, Y = mat + 1), it would be nice if an error or
warning message were issued to the effect that the "Y = " part is ignored or
not applicable or something to that effect.

I still don't understand why cbind.xts doesn't do what I expect.  If I  try
what Josh suggests on my xts example, the result is still confusing.

> cbind.xts(close, A = close[,"close"])

             close close.1

2007-01-03 1416.60 1416.60

2007-01-04 1418.34 1418.34

2007-01-05 1409.71 1409.71

2007-01-08 1412.84 1412.84

2007-01-09 1412.11 1412.11


If this helps:
*
*

*

> dput(close)

*
*

structure(c(1416.6, 1418.34, 1409.71, 1412.84, 1412.11), .indexCLASS =
"Date", .indexTZ = structure("", .Names = "TZ"), src = "yahoo",
updated = structure(1304875186.625, class = c("POSIXct",

*
*

"POSIXt")), class = c("xts", "zoo"), index = structure(c(1167811200,

*
*

1167897600, 1167984000, 1168243200, 1168329600), tzone = structure("",
.Names = "TZ"), tclass = "Date"), .Dim = c(5L,

*
*

1L), .Dimnames = list(NULL, "close"))

*

*
*
I was also unable to convert Josh's matrix example to xts.

> as.xts(mat, order.by = rownames())

Error in dimnames(x) : 'x' is missing

*
*
*The order.by parameter is required, but I don't understand the error
message and haven't been able to figure out how to fix it. If this helps:*
*
*

*

> dput(mat)structure(1:10, .Dim = c(10L, 1L), .Dimnames = list(NULL, "A"))

*

*
*
*This suggests that mat already has defined dimnames. So why does as.xts
give an error message about dimnames?  I was unable to figure out the
problem by looking at any of the help files. In particular the help file
for **as.xts.methods didn't seem to offer any clarifications--at least none
that I could understand.*
*
*
*
*
*-- Russ *



On Sun, May 8, 2011 at 12:26 PM, Joshua Wiley <jwiley.psych@gmail.com>wrote:

> class(mat)
> class(mat[, "A"])
>

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