xts objects comparison

I have the following two xts object:

https://dl.dropboxusercontent.com/u/102669/series1.rdata

https://dl.dropboxusercontent.com/u/102669/series2.rdata

With str i see that they are both xts objects

I can't understand why it's impossible to compare each element.

For example: series1 > series2
Why i don't get an xts object with a sequence of true and false?

Because series1 has a POSIXct index and series2 has a yearmon index.
The two objects have no index values in common, so there's nothing to
compare.

Convert series1's index to yearmon, and the comparison works.

index(series1) <- as.yearmon(index(series1))
tail(series1 > series2)

GSPC
2013-06-01 TRUE
2013-07-01 TRUE
2013-08-01 TRUE
2013-09-01 TRUE
2013-10-01 TRUE
2013-11-01 TRUE

Best,
--
Joshua Ulrich  |  about.me/joshuaulrich
FOSS Trading  |  www.fosstrading.com