How to add an additional tick on y-axis for a combined boxplot and scatter plot?

Hello all,

I've got 15 horizontal boxplots that reach up until y=1.6 and a scatter plot on the same figure, where the scatter plot are some x values at y=2 only.

I can see the boxplot ticks on the y-axis up until y=1.6. However, I cannot see a ytick on the y-axis at y=2. How can I add that?

**************************

My code until now is:

Ypos = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.5 1.6];
group_fordata = [repmat(Ypos(1),[size(x1),1]); 
   repmat(Ypos(2),[size(x2)],1); repmat(Ypos(3),[size(x3)],1);
   repmat(Ypos(4),[size(x4)],1); repmat(Ypos(5),[size(x5)],1);
   repmat(Ypos(6),[size(x6)],1); repmat(Ypos(7),[size(x7)],1);
   repmat(Ypos(8),[size(x8)],1); repmat(Ypos(9),[size(x9)],1);
   repmat(Ypos(10),[size(x10)],1); repmat(Ypos(11),[size(x11)],1);
   repmat(Ypos(12),[size(x12)],1); repmat(Ypos(13),[size(x13)],1);
   repmat(Ypos(14),[size(x14)],1); repmat(Ypos(15),[size(x15)],1)];
data = [x1;x2;x3;x4;x5;x6;x7;x8;x9;x1;x11;x12;x13;x14;x15]

figure 
boxplot(data, group_fordata,'positions', Ypos,'orientation','horizontal')
hold on
scatter([0.4 0.6],[2.0 2.0],'g.')
ylim([0 2.1])

Answer 1

[Chad Greene]

This solution's a little clunky, but it works:

% Create a label string for each Ypos:
for k = 1:numel(Ypos)
    NewTickLabels{k} = sprintf('%0.1f',Ypos(k));
end

% Include 2.0: 
NewTickLabels{k+1} = sprintf('%0.1f',2); 

% Set tick values and labels: 
set(gca,'YTick',[Ypos 2],'YTickLabel',NewTickLabels)

[Christina]

It works!!

Thanks a lot Chad!

[Chad Greene]

great!

Answer 2

[Chad Greene]

You can specify Ytick locations explicitly like this:

Ypos = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.5 1.6];
plot(rand(10,2),'bo')
ylim([0 2.1])
set(gca,'Ytick',[Ypos 1.7334 2])

[Christina]

Hi Chad. Thank you for your reply.

Unfortunately this does not work. At y=2.0, I get a ytick equal to 0.0.

*****************************

The code of the figure is:

figure

figure boxplot(data, group_fordata,'positions', Ypos,'orientation','horizontal')

hold on

scatter([0.4 0.6],[2.0 2.0],'g.')

ylim([0 2.1])

set(gca,'Ytick',[Ypos 2.0])

Any thoughts?

Many thanks

[Chad Greene]

Can you recreate the problem with dummy data?

[Christina]

Hi Chad,

Below there is an example with dummy data. Still in the position of my scatter two points, instead of 2.0 as a tick on the y-axis, I've got 0.0.

*********************************************************************

lower = 0;

upper = 1.6;

%%%%%%%%%%%%%%%%%%%%%

%% Actual boxplot data

x1 = lower + (upper - lower).*rand(200,1);

x2 = lower + (upper - lower).*rand(190,1);

x3 = lower + (upper - lower).*rand(180,1);

x4 = lower + (upper - lower).*rand(170,1);

x5 = lower + (upper - lower).*rand(160,1);

x6 = lower + (upper - lower).*rand(150,1);

x7 = lower + (upper - lower).*rand(140,1);

x8 = lower + (upper - lower).*rand(130,1);

x9 = lower + (upper - lower).*rand(120,1);

x10 = lower + (upper - lower).*rand(110,1);

x11 = lower + (upper - lower).*rand(100,1);

x12 = lower + (upper - lower).*rand(90,1);

x13 = lower + (upper - lower).*rand(80,1);

x14 = lower + (upper - lower).*rand(70,1);

x15 = lower + (upper - lower).*rand(60,1);

data = [x1;x2;x3;x4;x5;x6;x7;x8;x9;x10;x11;x12;x13;x14;x15];

%%%%%%%%%%%%%%%%%%

%% Positions on the y-axis

Ypos = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.5 1.6];

%%%%%%%%%%%%%%%%

% Data groups

group_fordata = [repmat(Ypos(1),[size(x1),1]);... repmat(Ypos(2),[size(x2)],1); repmat(Ypos(3),[size(x3)],1);... repmat(Ypos(4),[size(x4)],1); repmat(Ypos(5),[size(x5)],1);... repmat(Ypos(6),[size(x6)],1); repmat(Ypos(7),[size(x7)],1);... repmat(Ypos(8),[size(x8)],1); repmat(Ypos(9),[size(x9)],1);... repmat(Ypos(10),[size(x10)],1); repmat(Ypos(11),[size(x11)],1);... repmat(Ypos(12),[size(x12)],1); repmat(Ypos(13),[size(x13)],1);... repmat(Ypos(14),[size(x14)],1); repmat(Ypos(15),[size(x15)],1)];

%%%%%%%%%%%%%%%%

%%Plotting the boxplots and the scatter points

figure

boxplot(data, group_fordata,'positions',Ypos,'orientation','horizontal')

hold on

scatter([0.4 0.6],[2.0 2.0],'g.')

ylim([0 2.1])

set(gca,'Ytick',[Ypos 2.0])