I need to identify the diffetent outputs of confusionmat

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Hello!
I`m using the funtion confusionmat and I need to know the position of true positives and true negatives in this matrix.
For example
ans=
156 30
40 79
In this case, which are the true positives and true negatives if this is the output of confusionmat?
  1 Comment
muhammad
muhammad on 31 Aug 2015
hello i am also facing the same situation ..Did you get the solution?

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Answers (1)

Tom Lane
Tom Lane on 27 Oct 2014
The matrix is the count of actual and predicted values for each class. You can use the second output to get the class names. For example:
load fisheriris
tree = fitctree(meas,species);
[c,a] = confusionmat(species,predict(tree,meas))
c =
50 0 0
0 47 3
0 0 50
a =
'setosa'
'versicolor'
'virginica'
You could compute true negatives and positives from this information, but they are not returned directly.
  1 Comment
muhammad
muhammad on 31 Aug 2015
my C is like this as shown in below
0 670
181 10909
and a(order) is
1
2
please let me know how to find the TP,TN,Fp,Fn.

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