How to plot multiple time series with different time base in same plot?

wrote:

Hi

I have to time series with a different time base.

The first has only sporadic datapoints:
2011-02-01 15.29130
2011-02-08 17.60278
2011-02-15 17.99737
2011-02-22 25.43690

The other has a daily datapoint:
2011-02-01 342.34
2011-02-02 68.45
2011-02-03 130.47
2011-02-04 129.86
2011-02-05 81.98
2011-02-06 77.30
2011-02-07 81.38
2011-02-08 139.95
2011-02-09 124.40
...etc.

In Excel, it is fairly easy to get these two time series in one and the
same scatter plot, with two Y-axes, but how would you do this with R?

Also, I would like to obtain a data frame that contains both variables:
2011-02-01 342.34       15.29130
2011-02-02 68.45         NA
2011-02-03 130.47       NA
2011-02-04 129.86       NA
2011-02-05 81.98         NA
2011-02-06 77.30         NA
2011-02-07 81.38         NA
2011-02-08 139.95       17.60278
2011-02-09 124.40        NA
etc.

I can imagine that the data frame can be obtained using (nested) loops, but
that does not seem very efficient with a large dataset.

Any ideas?

Thanks a lot.

Matthijs Daelman

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