Question

Can’t find anywhere a Matlab code to plot Equivolume bars, does anybody knows how to?
http://www.armsinsider.com/education/armsonthemarket/equiv_chart.asp
Thanks, Alberto

Answer 1

Here is a simple function based on boxplot as suggested by zellus:

function hh = equivolumechart(x,w)
% EQUIVOLUMECHART - simple equivolume chart based on barplot
% x - 2xn high/low values, w - volume (box width)

h = boxplot(x,'width',w);
% make median unvisible
for ii=1:size(h,2)
    set(h(6,ii),'visible','off')
end
if nargout>0, hh = h; end 

end

Example:

a = randi(10,2,10);
w = randi(10,1,10)/10;
equivolumechart(a,w)

The function can be rewritten using patches, but this one works pretty well.

You probably can use CANDLE function from Financial Toolbox setting width to patch objects, but I don’t have the toolbox.