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[求助]
帮忙解释加下划线的四句code，谢谢
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Sample Text %Procedure for the likelihood% function f=lpr(x) global de dr pres uptop nd n prp prp2 ndr qp; % Initial Quality Perception; % True Quality Perception; % Detailing Signal Variance; % Initial Quality Variance iqp=x(1); tqp=x(2); dsv=exp(x(3)); iqv=1; ndr=zeros(n*6,nd); qp=ndr; for i=1:nd %Distribution of Signals for each time period% Sample Text %Mean quality perceptions for each time period% qp(:,i)=((iqp/iqv)+(ndr(:,i)/dsv))./((1/iqv)+(de/dsv)); end %Prescription probability% prp=exp(qp)./(1+exp(qp)); %No prescription probability% nprp=1./(1+exp(qp)); %Choose appropriate probability or 1 depending upon behavior and number of periods physician active in data% prp2=zeros(n*6,nd); for i=1:nd prp2(:,i)=((prp(:,i).*pres)+(nprp(:,i).*(1-pres))).^uptop; end %Reshaping to compute likelihood% Sample Text |
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ndr(:,i)=tqp*de+(sqrt(dsv)*sqrt(de)).*dr(:,i); prp2=reshape(prp2',n*nd,6); prp2=mean(reshape((prod(prp2',1))',nd,n),1); f=-sum(sum(log(prp2))); %Procedure for the likelihood% function f=lpr(x) global de dr pres uptop nd n prp prp2 ndr qp; % Initial Quality Perception; % True Quality Perception; % Detailing Signal Variance; % Initial Quality Variance iqp=x(1); tqp=x(2); dsv=exp(x(3)); iqv=1; ndr=zeros(n*6,nd); qp=ndr; for i=1:nd %Distribution of Signals for each time period% ndr(:,i)=tqp*de+(sqrt(dsv)*sqrt(de)).*dr(:,i); %Mean quality perceptions for each time period% qp(:,i)=((iqp/iqv)+(ndr(:,i)/dsv))./((1/iqv)+(de/dsv)); end %Prescription probability% prp=exp(qp)./(1+exp(qp)); %No prescription probability% nprp=1./(1+exp(qp)); %Choose appropriate probability or 1 depending upon behavior and number of periods physician active in data% prp2=zeros(n*6,nd); for i=1:nd prp2(:,i)=((prp(:,i).*pres)+(nprp(:,i).*(1-pres))).^uptop; end %Reshaping to compute likelihood% prp2=reshape(prp2',n*nd,6); prp2=mean(reshape((prod(prp2',1))',nd,n),1); f=-sum(sum(log(prp2))); |
2楼2014-02-09 03:55:51
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