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annotate rDiff/src/tests/calcl_nbin_pdf.m @ 1:08d3a6143873

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author vipints
date Tue, 08 Oct 2013 06:54:25 -0400
parents 0f80a5141704
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1 function [RET]=calcl_nbin_pdf(VAL,R,P)
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2 %uses formula used by matlab for compatability
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4 RET=zeros(size(VAL,1),size(VAL,2));
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5 IDX=VAL==round(VAL);
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6 %RET(IDX) = exp(gammaln(R+VAL(IDX))-gammaln(VAL(IDX)+1)-gammaln(R)+R*log(P)+VAL(IDX)*log1p(-P));
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9 nk = (gammaln(R + VAL(IDX)) - gammaln(VAL(IDX) + 1) - gammaln(R));
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10 RET(IDX) = nk + (R.*log(P)) + (VAL(IDX).*log(1 - P));
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11 RET(IDX) = exp(RET(IDX));