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% DENDPLOT: Plots a dendrogram given a topology matrix.
%
% Usage: dendplot(topology,{labels},{fontsize})
%
% topology = [(n-1) x 4] matrix summarizing dendrogram topology:
% col 1 = 1st OTU/cluster being grouped at current step
% col 2 = 2nd OTU/cluster
% col 3 = ID of cluster being produced
% col 4 = distance at node
% labels = optional [n x q] matrix of group labels for dendrogram.
% fontsize = optional font size for labels [default = 10].
%
% RE Strauss, 5/27/98
% 8/20/99 - miscellaneous changes for Matlab v5
function dendplot(topology,labels,fontsize)
if (nargin<2)
labels = [];
end;
if (nargin < 3)
fontsize = [];
end;
if (isempty(fontsize)) % Default font size for labels
fontsize = 10;
end;
r = size(topology,1);
n = r+1; % Number of taxa
links = dendhier([],topology,n-1); % Find dendrogram links (branches)
otu_indx = find(links(:,1)<=n); % Get sequence of OTUs
otus = links(otu_indx,1);
y = zeros(2*n-1,1); % Y-coords for plot
y(otus) = 0.5:(n-0.5);
for i = 1:(n-1)
y(topology(i,3)) = mean([y(topology(i,1)),y(topology(i,2))]);
end;
clf; % Begin plot
hold on;
for i = 1:(2*n-2) % Horizontal lines
desc = links(i,1);
anc = links(i,2);
X = [links(i,3) links(i,4)];
Y = [y(desc) y(desc)];
plot(X,Y,'k');
end;
for i = (n+1):(2*n-1) % Vertical lines
indx = find(links(:,2)==i);
X = [links(indx,4)];
Y = [y(links(indx(1),1)) y(links(indx(2),1))];
plot(X,Y,'k');
end;
maxdist = max(links(:,4));
for i = 1:n % OTU labels
if (~isempty(labels))
h = text(-.02*maxdist,y(i),labels(i,:)); % For OTUs on right
set(h,'fontsize',fontsize);
else
h = text(-.02*maxdist,y(i),num2str(i)); % For OTUs on right
set(h,'fontsize',fontsize);
% text(-.06*maxdist,y(i),num2str(i)); % For UTOs on left
end;
end;
axis([0 maxdist+0.03*maxdist 0 n]); % Axes
axis('square');
set(gca,'Ytick',[]); % Suppress y-axis labels and tick marks
set(gca,'Ycolor','w'); % Make y-axes invisible
set(gca,'Xdir','reverse'); % For OTUs on right
hold off;
return;
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