source:
prextra/tree_gini.m
@
33
| Last change on this file since 33 was 27, checked in by dtax, 13 years ago | |
|---|---|
| File size: 103 bytes | |
| Line | |
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| 1 | function g = tree_gini(y,K) |
| 2 | |
| 3 | out = zeros(1,K); |
| 4 | for k=1:K |
| 5 | out(k) = mean(y==k); |
| 6 | end |
| 7 | |
| 8 | g = out*(1-out)'; |
| 9 |
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