Adding lines or other geoms to a ggplot by calling a custom function
Sometimes you generate lots of ggplots of a similar kind, e.g. visualizations of
different timeseries. Then you want to highlight some dates where something
special had happened and you want to show that the value you are plotting changed
at these date... The post Adding lines or other geoms to a ggplot by calling a custom function first appeared on R-bloggers.
http://dlvr.it/S3XGMj
http://dlvr.it/S3XGMj

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