How to add values to the confusion matrix?

Question

The code is as follows:

g1 = [1 1 2 2 3 3]';    % Known groups
g2 = [1 1 2 3 4 5]';    % Predicted groups

[C,order] = confusionmat(g1,g2);
figure; imagesc(C);

accuracyAll = trace(C)/sum(C(:));
disp(['Total accuracy is ',num2str(accuracyAll*100),'%']);

When you run the code, you will get a figure. My question is how to add the corresponding accuracy in the blocks of the figure?

`C` is already a confusion matrix. What exactly do you mean by "add the corresponding values"? — rayryeng, Feb 28 '17 at 21:17
@LuisMendo OK that makes much more sense. I agree with your answer below. — rayryeng, Feb 28 '17 at 21:20
@rayryeng: This may be a better reference duplicate: [How do I visualize a matrix with colors and values displayed?](http://stackoverflow.com/q/3942892/52738) — gnovice, Feb 28 '17 at 21:35
@gnovice That's the one I was looking for... I was looking for literally 10 minutes on your list of posts... I had to settle with Amro's because I couldn't find it. I'm going to reopen for you to dupehammer. — rayryeng, Feb 28 '17 at 21:35
@rayryeng, i modified the question. I thought for each block there is a corresponding accuracy for it. — brown wang, Feb 28 '17 at 21:51

Luis Mendo · Accepted Answer · 2017-02-28T21:32:56.063

1

Is this what you want?

[ii, jj, vv] = find(C);
text(jj(:), ii(:), num2str(vv(:)))

edited Feb 28 '17 at 21:32

answered Feb 28 '17 at 21:19

Luis Mendo

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It did not put the exact corresponding values in each block. – brown wang Feb 28 '17 at 21:24
Please see the C above, only 5 blocks contain values. – brown wang Feb 28 '17 at 21:28
Do you mean you only want nonzero values? You should have specified that. – Luis Mendo Feb 28 '17 at 21:30
Yes, only the vaules shows in C matrix. – brown wang Feb 28 '17 at 21:31
See edited answer – Luis Mendo Feb 28 '17 at 21:33
@brownwang "Only the values shows in `C` matrix" doesn't make any sense. Each element in the matrix is a value. – rayryeng Feb 28 '17 at 21:35
1

@brownwang [This](http://oi64.tinypic.com/555xk2.jpg) is what I'm getting using your `C`. If it's not correct, you'll have to do a better attempt at explaining why – Luis Mendo Feb 28 '17 at 21:46
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@LuisMendo You've done more than enough. I think this is what the OP wants even when he has poorly communicated it. – rayryeng Feb 28 '17 at 21:50
@brownwang Your question is still unclear to me. If you want to place the same number in all nonzero blocks, use something like `[ii, jj] = find(C); text(jj(:), ii(:), num2str(33))` – Luis Mendo Feb 28 '17 at 23:22
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@brownwang Oh, come on, the number was just an example. I don't really get what you want, sorry – Luis Mendo Feb 28 '17 at 23:44
@brownwang that was his precious answer before you decided to complain. Your indecisiveness is intolerable. – rayryeng Mar 01 '17 at 08:10

How to add values to the confusion matrix?

1 Answers1