Hi, I want to include the correlation coefficient on each of the subplots of GPLOTMATRIX.

My problem is how do I put some text on to the subplots.

This is one of my unsuccessful attempts -

 X = randn(200,3);
r = corrcoef(X);
return
[H,AX,BigAx] = gplotmatrix(X,[],[],[0.5 0.5 1],[],1,'off','none');
set(AX(1,2));

 plot(AX(1,2),[0],[0],'xk');
 text(.1,.9,['r = ',num2str(r(1,2),2)],'units','norm');

thanks..

Answer 1

[Geoff Hayes]

Warwick - I don't have the Statistics and Machine Learning Toolbox (so can't validate the following), but in your code you do

 [H,AX,BigAx] = gplotmatrix(X,[],[],[0.5 0.5 1],[],1,'off','none');

where AX is an array of handles to all of the axes. The subsequent line of code

 set(AX(1,2));

seems incomplete. What are you trying to set for this axes? Perhaps you intend to set AX(1,2) as the current axes so that the text is written to it. Try using axes instead as

 axes(AX(1,2));

 % now draw and write the text
 plot(AX(1,2),[0],[0],'xk');
 text(.1,.9,['r = ',num2str(r(1,2),2)],'units','norm');

[Warwick]

Thanks so much, Geoff. With that suggestion I was able to get a very satisfactory result. This is the code snippet that I'm using now - in case it helps anyone else.

X = randn(100,3);
r = corrcoef(X);

[H,AX,BigAx] = gplotmatrix(X,[],[],[0.5 0.5 1],[],1,'off','none');

for row = 1:3
    for col = 1:3
        if row == col; continue; end
        axes(AX(row,col));
        hold on
        text(.1,.9,['r = ',num2str(r(row,col),2)],'units','norm');
    end
end

return

[Geoff Hayes]

Glad it worked out, Warwick!