How to use boxes to plot a freqency band?

I'd like to create a plot that looks similar to this:

 Row1:| [_____]  [_______] [_] [___] [___________]
 Row2:|    [________] [_]  [______] [_________]
      |____________________________________________________
                         Frequency

The idea is that Row1 and Row2 contain frequency spans that I would like to identify with boxes.

I can't seem to make the horizontal bar graph do something like this.

Any help is greatly apprecited. Thanks all!

Answer 1

[Rick Rosson]

You may want to consider using patch objects. For more information:

   >> doc patch

HTH.

Rick

Answer 2

[Oleg Komarov]

% I suppose you have the starting and ending point of each block. % You have to ensure that they are monotonically increasing across rows and the number of columns is even.

sten = [1 3 7 14 16 17;
        2 4 8  9 11 19];

% Create X coordinates for the boxes

clear X
szSt = size(sten);
df   = diff(sten,[],2);
X(:,1:2:szSt(2)*2) = [sten(:,1) df];
X = [cumsum(X,2) sten(:,end)];

% Create the Y coordinates for the boxes

Y = repmat(bsxfun(@minus,[2.5; 1.5; 1.5; 2.5],0:szSt(1)-1), szSt(2)/2,1);

% Reshape

X = reshape(X.',4,[]);
Y = reshape(Y,4,[]);

% Figure and axes

figure('units','pix','pos',[300 200 640 140])
axes('units','pix','pos',[20 20 600 100],'Xlim',[0 max(sten(:))+1],...
     'Ylim',[0 szSt(1)+.5],'Ytick',1:szSt(1),'YtickL',szSt(1):-1:1)

patch(X,Y,ones(size(X)))