How I obtain with function bar3 different sizes for each bar in MATLAB?

Hi all,

I'm writing to inquire about the doubt that I have written for the title of the question:

%----------------------------
values = [1.0 0.6 0.1;  0.0 1.0 0.3;  0.9 0.4 1.0];
h = bar3(values);
shading interp
for i = 1:length(h)
    % Get the ZData matrix of the current group
    zdata = get(h(i),'Zdata');
    set(h(i),'Cdata',zdata)
end
set(h,'EdgeColor','k')
view(-61, 68);
colormap cool
colorbar
%----------------------------

I want to obtain different sizes for each bar that the sizes are function of variable "values". My aim is also to vary the size of each bar according to the Z value, which is between 0 and 1. When I say "size" I mean the X and Y dimensions of the square, the area of the bar in a top view

As shown in this example, I found a similar picture in http://www.sdtools.com/help/ii_mac.html

Thank you very much, José Manuel

Answer 1

[Jan Orwat]

Hello José,

I hope I've understood you correctly. Do you want bars to be cubes which edges are given by array 'values'? If so, I think it is possible to manipulate XData and YData of the bars. Check out this code below (I've edited yours). With a few changes to it, I think you will get what you want.

values = [1.0 0.6 0.1;  0.0 1.0 0.3;  0.9 0.4 1.0];
h = bar3(values);
shading interp  
for i = 1:length(h)
  % Get the ZData matrix of the current group
  zdata = get(h(i),'Zdata');
  set(h(i),'Cdata',zdata);
  % Get the YData and the XData to manipulate it
  xdata = get(h(i),'XData');
  ydata = get(h(i),'YData');
  xmat = [nan  -1   1 nan;
           -1  -1   1   1;
           -1  -1   1   1;
          nan  -1   1 nan;
          nan  -1   1 nan;
          nan nan nan nan];
  ymat = [nan  -1  -1 nan;
           -1  -1  -1  -1;
            1   1   1   1;
          nan   1   1 nan;
          nan  -1  -1 nan;
          nan nan nan nan];
  % Create new YData and new XData
  % manipulate width of bar3 columns
  xdata=xdata-.5*kron(1-values(:,i),xmat);
  ydata=ydata-.5*kron(1-values(:,i),ymat);
  set(h(i),'XData',xdata,'YData',ydata);
end
set(h,'EdgeColor','k')
view(-61, 68);
colormap cool
colorbar