```
suppressWarnings(RNGversion("3.5.0"))
set.seed(1)
x.date <- as.Date(paste(2003, rep(1:4, 4:1), seq(1,20,2), sep = "-"))
x <- zoo(matrix(rnorm(20), ncol = 2), x.date)
## the full time series
x
## and only matrix of observations
coredata(x)
## change the observations
coredata(x) <- matrix(1:20, ncol = 2)
x
```

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