how to add lines to histograms plotted by plotmatrix

Hi,

I want to add vertical lines to histograms plotted in the diagonal of a matrix of pair-wise scatter plots. I tried to use the graphic objects returned by plotmatrix;

[S,AX,BigAx,H,HAx] = plotmatrix(X); % X has 15 columns

for example,

subplot(15,15,1); hold on; line([1.2,1.2],get(AX(1),'YLim'),'Color','r')

AX(15); plot([1.2,1.2],[0,1.5],'Color','r')

etc. But so far none has worked out. I would appreciate any clue as I am clueless.

I use Matlab 2018a. Thanks.

Answer 1

[Akira Agata]

How about the following?

% Sample data
X = rand(50,3);

figure
[~,ax] = plotmatrix(X);
hold(ax(1,3),'on')
plot(ax(1,3),[0.2 0.2],ax(1,3).YLim,'r:','LineWidth',2)
hold(ax(2,1),'on')
plot(ax(2,1),[0.5 0.5],ax(2,1).YLim,'r','LineWidth',2)

Just FYI:

If you can upgrade your MATLAB to R2018b, you can do the same thing slightly easier by using newly introduced xline function, like:

figure
[~,ax] = plotmatrix(X);
xline(ax(1,3),0.2,'r:','LineWidth',2)
xline(ax(2,1),0.5,'r','LineWidth',2)

[Etsuko]

Thank you very much!

It needed to specify the axis of the histograms. Just an easy modification of your suggestion did what I wanted. Thank you!

[S,AX,BigAx,H,HAx] = plotmatrix(X); % X has 15 columns
hold(HAx(1,1),'on')
plot(HAx(1,1),[2.2 2.2],HAx(1,1).YLim,'r:','LineWidth',2)