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How do you easily get beautiful calendar heatmaps of time series in ggplot2? E.g:**MarginTale**, and kindly contributed to R-bloggers)From MarginTale |

How do you attack the problem? Looking at the example output above:

- We facet_grid by "months" and "years"
- The data itself is plotted by "week of month" and "day of week" and coloured according to the value of interest

So, given a time series we just have to fiddle with time indexes to create a data.frame containing the time series as well as per observation the corresponding "month", "year", "week of month", "day of week". The rest is then a one-liner of code with Hadley's wonderful ggplot2 system.

The following code contains step by step comments:

The following code contains step by step comments:

It should be easy to wrap into a function and I hope its useful.

To

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