# How to Display Multiple Histograms in Matlab

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MATLAB is a programming and data analysis environment for mathematics, engineering and science. A histogram is a type of graph representing the frequency of a certain value or a range of values in a distribution of data. MATLAB contains a built-in function for calculating and graphing histograms from data, but requires a little extra work to display two or more histograms simultaneously on the same axes.

• Calculate the data for the first histogram and save it to variables for later use. Use the MATLAB function "hist" as shown:

[counts_1, edges_1] = hist(Y,edges_in);

Where edges_in is a vector of the beginning edges of the bins, or:

[counts_1, edges_1] = hist(Y,nBins);

Where nBins is the number of equally spaced bins in the histogram. If neither edges_in or nBins is given, MATLAB calculates the histogram with 10 bins.

• Calculate the data for the second, and any subsequent histograms.

• Plot the first histogram using "bar(edges_1,counts_1);"

The appearance of the graph can be customized according to the MATLAB documentation for plotting. Alternatively, using a stairstep graph "stairs(edges_1,counts_1);" may make multiple histograms easier to see on the same graph.

• Type the command "hold on" into the MATLAB command window to prevent your current figure from being overwritten by the new graph.

• Plot the second and any subsequent histograms, customizing appearance as desired.

• Type the command "hold off" to prevent any further drawing from being added to the figure containing your histograms.

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