MATLAB: How to change the color of zero or nan Zdata in BAR3 plot

bar3colormap

I have 3D bar graph where length of the YData is not always the same so I have several zero Zdata values. I would like to set zero Zdata to white color. I changed zero Zdata to nan but bar3 function still gives the color of the bar graph even for the nan or zeros. Any help would be appreciated. Thank you.

Sandra

Best Answer

You will have to set the surface's 'cdata' and 'zdata' to nan.

For example:

x = magic(4);
bar3(x)
h = get(gca,'children'); %surfaces making up each bar group
h4c = get(h(4),'cdata');
set(h(4),'cdata',[nan(6,4);h4c(7:end,:)]) %6 rows per bar
h4z = get(h(4),'zdata');
set(h(4),'zdata',[nan(6,4);h4c(7:end,:)]);

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

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

MATLAB: Contour not rendered for constant ZData

You should be using .* instead of *

If you were dividing by X or Y then you would also need to us ./ instead of / but it looks like all of your divisions are by constants rather than vectors or arrays; I recommend replacing the / with ./ anyhow so that it is clear to the readers that you have taken that into account.

Best Answer

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

MATLAB: Contour not rendered for constant ZData

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