# Histogram of two data sets [closed]

I want to plot a histogram of two data sets in the following way:

I've written this code, and following are my results:

Can you help me out? What should I do?

• Please stop posting images of your code instead include a copyable working example. See asking guidelines. As stated in linked page you should show some effort, is Histogram[{a,b}] all you've tried? Have you seen its documentation? And 'see also' section? p.s. See BarChart/BinCounts etc too.
– Kuba
May 7, 2018 at 10:56
• Yes, I did try BarChart, but it just displays one value at one place, and not that how many times those numbers appeared. BinCounts also didn't help. May 7, 2018 at 11:50
• You have to pore through the examples. Try something like bins = Range[0, 3]/2. - 0.25; BarChart[Transpose[BinCounts[#, {bins}] & /@ {data1, data2}], ChartLabels -> {Range[0, 2]/2, None}, ImageSize -> 600]. May 7, 2018 at 12:03
• Thanks Michael.. May 7, 2018 at 13:09
• You should look at HistogramList as a source of the data you need to transform your data into a bar chart. May 7, 2018 at 16:50

## 1 Answer

I don't like your choice of example datasets (which always produces mirror image histograms), so I am going to contrive my own.

SeedRandom[42]; data1 = RandomChoice[{0, 1/2, 1}, 100]
SeedRandom[24]; data2 = RandomChoice[{0, 1/2, 1}, 100]


Now, I will use HistogramList list to get the data transformed into something useful for making a bar chart.

{lblData, barHeight1} = HistogramList[data1, 3];
{notUsed, barHeight2} = HistogramList[data2, 3];
labels = Row[{#1, " – ", #2}] & @@@ Partition[lblData, 2, 1];


With the computed data, the bar chart can be made with

BarChart[Transpose[{barHeight1, barHeight2}], ChartLabels -> {labels, None}]