Hi

I have two irregular time series, which are of different lengths and being  
and end at different times. For the common subset of time that they both  
span, they should have the same values, but the values may occur at  
slightly different time intervals. I am trying to "line up" the identical  
values and reconcile them. I have merged the two series into a zoo object  
which looks like the following:

> head(m)
aq$mid d2$mid
2009-06-22 16:25:40.044 NA 1.63755
2009-06-22 16:25:40.909 1.63760 NA
2009-06-22 16:25:40.987 NA 1.63760
2009-06-22 16:25:41.657 1.63755 NA
2009-06-22 16:25:41.738 NA 1.63755
2009-06-22 16:25:41.909 1.63760 NA

What I would like to do is merge the series column-wise : ie where one  
column contains NAs, replace the NAs with the non-NA value from the other  
column. Is this possible easily?

Here is a dput() of the data above:

structure(c(NA, 1.6376, NA, 1.63755, NA, 1.6376, 1.63755, NA,
1.6376, NA, 1.63755, NA), .Dim = c(6L, 2L), .Dimnames = list(
NULL, c("aq$mid", "d2$mid")), index = structure(c(1245684340.044,
1245684340.909, 1245684340.987, 1245684341.657, 1245684341.738,
1245684341.909), class = c("POSIXt", "POSIXct")), class = "zoo")


Cheers
-- Rory

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