How to add leading zeros?

rr-faqformattingnumber-formatting
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Plotting two variables as lines using ggplot2 on the same graph

rr-faqggplot2graphtime-series
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How to create a consecutive group number

rr-faq
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Quickly reading very large tables as dataframes

rr-faqdataframeimport
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Faster ways to calculate frequencies and cast from long to wide

raggregatereshape2plyr
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