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increasing the fontsize of the y-label tickmarks on a dendrogram/tree

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cgo on 29 May 2020
Edited: Adam Danz on 1 Jun 2020
I created a dendrogram where the x-axis is the distance/dissimilarity between clusters and the y-axis are the objects. I want to increase the font size, but only the x-axis objects are increased, the y-axis labels remain the same. How do I do this?


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cgo on 29 May 2020
sorry. i forgot to say that i used custom labels here. So only the distance/dissimilarity measures are default. The labels of the individual points are custom. So upon resizing, only the distance axis is resized. The parts where I used my custom label are unaffected by the fontsize change.
Adam Danz
Adam Danz on 29 May 2020
I can provide a quite answer as soon as I have a working example that produces your plot (or you could attach the figure file).
cgo on 29 May 2020
%%I also made modifications to the colours as a visualization requirement.
X = rand(10,5);
Y = pdist(X);
Z = linkage(Y);
labels = {'man1','man2', 'man3','man4','man5','woman1','woman2','woman3','woman4', 'woman5'};
H = dendrogram(Z,0, 'Labels', labels, 'Orientation','left');
ax = gca; % get the axes handle
X = get(ax.Children,'XData'); % Get x values of all lines
Y = get(ax.Children,'YData'); % Get y values of all lines
ax = gca; % get the axes handle
lab = ax.YAxis.TickLabels; % get all the labels
loc = ax.YAxis.TickValues; % get all labels location
[ulab,~,lab_ind] = unique(lab); % find all unique labels
clr = lines(numel(ulab)); % make a color map
for k = 1:numel(ulab) % for every type of lable
ind = strcmp(ulab{k},lab); % find all instances in lab
x = repelem(ax.XAxis.Limits(1)-0.01,sum(ind)); % make an x position vector
% place this lable at the same locations with a distinct color:
ax.YAxis.TickLabels = []; % remove the original labels
% replace the original labels with white space, to keep the axes position:
ax.YAxis.TickLabels = repelem(' ',max(cellfun(@numel,lab)));
for k = 1:numel(Y)
if Y{k}(1)==fix(Y{k}(1))
if Y{k}(3)==fix(Y{k}(3))
xlabel('distance/dissimilarity between clusters');

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Accepted Answer

Adam Danz
Adam Danz on 29 May 2020
Your y-labels aren't really tick labels. They are text objects. You need to store their handles and set their fontsize directly.
textLabels = gobjects(size(ulab)); % PREALLOCATE HANDLES VECTOR
for k = 1:numel(ulab)
textLabels(k) = text(x,loc(ind),lab(ind),'Color',clr(k,:)); % STORE EACH HANDLE
Then change fontsize
set(textLabels,'FontSize', 18)
However, the whole approach seems inefficient.
Instead of defining the labels at the top of your code and then change the labels within the loop, just set the labels correctly before making the plot. That way your lables are actual y-tick labels and will respond to set(gca,'fontsize',18).

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