So I'm working with this data set where there is just one input(a date and time) per line in a .csv file. I've let Mathematica understand the input using "DateStringFormat". The time looks like Year-Month-Day-Hour:Minute:Second

How do I go about plotting a cumulative histogram of events occurring (up until 100% at the end) where I have time on the x-axis and percent of events occurred on the y-axis?

  • $\begingroup$ Does each date represent a single event? Is that the only data in the file? Is the data sorted? $\endgroup$
    – N.J.Evans
    Jun 9, 2015 at 21:22
  • $\begingroup$ An example of the data and some evidence of what you have tried so far would be helpful $\endgroup$ Jun 9, 2015 at 21:27
  • 1
    $\begingroup$ I suspect you'll want to look up DateListPlot and MapIndexed $\endgroup$
    – george2079
    Jun 9, 2015 at 21:35
  • $\begingroup$ Hey everyone, sample data looks like "2013-01-01-03:10:02.430"} $\endgroup$ Jun 9, 2015 at 21:52
  • $\begingroup$ shouldn't Histogram[data, "Log", {"Log", "CumulativeCount"}] work? where data is the total imported set $\endgroup$ Jun 9, 2015 at 21:52

1 Answer 1


synthetic data:

 strings = 
   DateString /@ 
   Sort@RandomVariate[ NormalDistribution[AbsoluteTime[Date[]], 10^7],200];

Note this date string format is not exactly the same as yours but I think all this will still work.

 DateListPlot[MapIndexed[ {#, First@#2} &, strings ], 
    Ticks -> {DateRange[{2013, 12}, {2016, 2}, {{3, "Month"}}], 
       Automatic}, Axes -> True, Frame -> False, 
        DateTicksFormat -> {"MonthShort", "/", "Year"}]

enter image description here

make that MapIndexed[ {#, 100 First@#2/Length@strings} &, strings ] for "%" ..

If you want the data binned: ( DateListPlot also has some binning options, but it will not look like a histogram bar chart)

 Histogram[ (AbsoluteTime /@ strings - AbsoluteTime@strings[[1]] ) // 
   #/(60 60 24) &, Automatic , "CumulativeCount" , 
   AxesLabel -> {"days", "event count"}]

enter image description here

(sorry that plot label should be "days" .. )


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