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root / _beattracker / dojsdiv2.m @ 8:b5b38998ef3b
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function sd = dojsdiv2(pre,post); |
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pre = pre-min(pre); |
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post = post-min(post); |
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pre = pre(:)'; |
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post = post(:)'; |
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pre = pre+eps; |
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post = post+eps; |
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pre = pre/sum(pre); |
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pi1 = 0.5; |
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pi2 = 0.5; |
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% normalise to sum to unity |
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pre = pre/(sum(pre)+eps); |
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post = post/(sum(post)+eps); |
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% combined distribution |
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a1 = pi1*pre + pi2*post; |
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%sd = -sum(a1.*log(a1)) + pi1*sum(pre.*log(pre)) + pi2*sum(post.*log(post)); |
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sd = sum((-a1.*log(a1)) + pi1*(pre.*log(pre)) + pi2*(post.*log(post))); |