How can I create a histogram from aggregated data in R?

Question

I have a data frame that has a format like the following:

Month       Frequency
2007-08     2
2010-11     5
2011-01     43
2011-02     52
2011-03     31
2011         


        

Answer 1

Yea, rep solutions will waste too much memory in most interesting/large cases. The HistogramTools CRAN package includes an efficient PreBinnedHistogram function which creates a base R histogram object directly from a list of bins and breaks as the original question provided.