source:
prextra/tree_gini.m
@
138
| Last change on this file since 138 was 27, checked in by dtax, 13 years ago | |
|---|---|
| File size: 103 bytes | |
| Rev | Line | |
|---|---|---|
| [27] | 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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