Paul, the order that you are calling the functions is incorrect. You need to create the histogram plot prior to assigning labels and a title. Also, you are using the xlabel, ylabel, and title functions with the wrong syntax. What you are using is basically creating a variable with the same name as the xlabel, ylabel, and title functions. See example below. histogram(salmon_length,edges,'DisplayStyle','stairs'); % Now that a graphics object (histogram plot axes) exists, the following functions will target the % active axes. xlabel('Length') ylabel('Count') title('Histogram of salmon lengths')

Your code should have worked. Try my boilerplate code snippet: % Let's compute and display the histogram. [pixelCount, grayLevels] = imhist(grayImage); bar(grayLevels, pixelCount); % Plot it as a bar chart. grid on; title('Histogram of original image', 'FontSize', fontSize); xlabel('Gray Level', 'FontSize', fontSize); ylabel('Pixel Count', 'FontSize', fontSize); xlim([0 grayLevels(end)]); % Scale x axis manually.

I think the simplest way would be to use a multiline title, optionally along with TeX formatting to de-emphasise the additional info. To make a multiline title, pass a cell array of strings like this:

title({'\fontsize{16}Actual Title';'\fontsize{8}other info'})

Being consistent across the histograms, I think this would look tidier than having text on the graph itself that might move around.

As of MATLAB R2017a, there is no built-in feature to add bin count labels to histogram plots. Although this is not a built-in feature of MATLAB, you may label the bars of your histogram by using the output of the HIST command to create text objects. The following is an example that you can use as a guide: % Create random data for the sake of the example data = 10*rand(1,100); % Draw the histogram hist(data); % Get information about the same % histogram by returning arguments [n,x] = hist(data); % Create strings for each bar count barstrings = num2str(n'); % Create text objects at each location text(x,n,barstrings,'horizontalalignment','center','verticalalignment','bottom')

% Create random data for the sake of the example data = 10*rand(1,100); % Draw the histogram and return histogram object h = histogram(data); % Get information about the histogram edges = get(h,'BinEdges'); n = get(h,'Values'); % Create strings for each bar count barstrings = num2str(n'); % Create text objects at each location x = (edges(1:end-1)+edges(2:end))/2; text(x,n,barstrings,'horizontalalignment','center','verticalalignment','bottom')