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

Asked by Warwick
on 17 Jan 2016
Latest activity Commented on by Geoff Hayes
on 18 Jan 2016
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..

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1 Answer

Answer by Geoff Hayes
on 17 Jan 2016
 Accepted Answer

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');

  2 Comments

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

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