I need to identify the diffetent outputs of confusionmat

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Ines
Ines 2014-10-19
评论： muhammad 2015-8-31
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?

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回答（1 个）

Tom Lane
Tom Lane 2014-10-27
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.
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muhammad
muhammad 2015-8-31
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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