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auc_from_ranks.m
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auc_from_ranks.m
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function [AUROC,AUPR,fpr,recall,recall_new,precision_new]=auc_from_ranks(acc_ranked,adj,n_points)
% Created by Nan Papili Gao
% Institute for Chemical and Bioengineering
% ETH Zurich
% E-mail: nanp@ethz.ch
%
% Copyright. November 1, 2016.
maxWEIGHT=max(max(abs(acc_ranked)));
acc_ranked=acc_ranked/maxWEIGHT;
adj=adj*3;
fp=zeros(1,n_points+1);
tn=zeros(1,n_points+1);
tp=zeros(1,n_points+1);
fn=zeros(1,n_points+1);
fpr=zeros(1,n_points+1);
precision=zeros(1,n_points+1);
recall=zeros(1,n_points+1);
thr=0:1/n_points:1;
for i=1:n_points+1
sign_info=sign(acc_ranked);
sign_info(sign_info==0)=1;
adj_m=(abs(acc_ranked)>=thr(i)).*sign_info;
compare=abs(adj_m+adj);
fp(1,i)=nnz(compare<3 & compare>0);
tp(1,i)=nnz(compare==4);
fn(1,i)=nnz(compare==3);
tn(1,i)=nnz(compare==0);
precision(1,i)=tp(1,i)/(tp(1,i)+fp(1,i));
recall(1,i)=tp(1,i)/(tp(1,i)+fn(1,i));
fpr(1,i)=fp(1,i)/(fp(1,i)+tn(1,i));
end
i=1;
precision=fliplr(precision);
recall=fliplr(recall);
precision_new=[1 precision];
recall_new=[0 recall];
fpr=fliplr(fpr);
AUROC(i)=auc(fpr(i,:),recall(i,:));
AUPR(i)=auc(recall_new(i,:),precision_new(i,:));
end