I'll admit that I misunderstood the question the last time it was posted. However, the general approach still works the same.
%Load data
data = load('data matrix.mat');
t = load('time matrix.mat');
% Concatenate a,b,c with grouping variable
ts = [data.a,ones(size(data.a,1),1);data.b,ones(size(data.b,1),1).*2;data.c,ones(size(data.c,1),1).*3];
% Sort and make continous
ts = sortrows(ts,1);
td = ts(:,2)-ts(:,1); %Durations
td = cumsum(td);
% Make surface bar
n=length(td);
X=[td';td'];
Y=[1.1.*ones(1,n);0.9.*ones(1,n)];
colormap(lines(3))
Z=ts(:,3)';
Z=[Z;Z];
surf(X,Y,Z)
view([0 90])
set(gca,'ycolor','none')
.
Does it look alright? Note that the black stripes are edges that divide segments. You can remove those by setting the 'edgecolor' to 'none' in the surf call, getting this instead:
