You can use the ButtonDownFcn function. Here's a demo you can run. It prints the selected bar index to the command window.
figure();
h = histogram(randn(10));
h.ButtonDownFcn = @clickHistFcn;
function clickHistFcn(hObj,event)
% Get the bar edges and click coordinate
edges = hObj.BinEdges;
click = event.IntersectionPoint;
% Determine which bar was clicked
barIdx = find(click(1) >= edges, 1, 'last');
% Do whatever you want with that....
fprintf('bar %d selected.\n',barIdx)
end
Note, this code above does not ignore empty bar bins. For example, try it with these data.
h = histogram([rand(1,20),rand(1,20)+5],10)
If you'd like to ignore empty bars,
function clickHistFcn(hObj,event)
% Get the bar edges and click coordinate
edges = hObj.BinEdges;
values = hObj.Values;
edges([false,values==0]) = []; %remove edges that contain empty bars
click = event.IntersectionPoint;
% Determine which bar was clicked
barIdx = find(click(1) >= edges, 1, 'last');
fprintf('bar %d selected.\n',barIdx)
end
