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

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Warwick 2016-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/264037-hi-i-want-to-include-the-correlation-coefficient-on-each-of-the-subplots-of-gplotmatrix

评论： Geoff Hayes 2016-1-18

采纳的回答： Geoff Hayes

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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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Answer 1

Geoff Hayes 2016-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/264037-hi-i-want-to-include-the-correlation-coefficient-on-each-of-the-subplots-of-gplotmatrix#answer_206453

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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');

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Warwick 2016-1-18

编辑：Geoff Hayes 2016-1-18

在 MATLAB Online 中打开

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