# Matlab Code for Spike Time Distances, Parallel in q

#### Thomas Kreuz: tkreuz@ucsd.edu

main cost-based metrics page
algorithm page for cost-based metrics

## Matlab code for Spike Time Metric, Parallel in q

function d=spkd_qpara(tli,tlj,costs) % % d=spkd(tli,tlj,costs) calculates the "spike time" distance % (Victor & Purpura 1996) for a single costs % % tli: vector of spike times for first spike train % tlj: vector of spike times for second spike train % costs: costs per unit time to move a spike % % Copyright (c) 1999 by Daniel Reich and Jonathan Victor. % Translated to Matlab by Daniel Reich from FORTRAN code by Jonathan Victor. nspi=length(tli); nspj=length(tlj); if costs==0 d=abs(nspi-nspj); return elseif costs==Inf d=nspi+nspj; return end scr=zeros(nspi+1,nspj+1); scr(:,1)=(0:nspi)'; scr(1,:)=(0:nspj); scr=repmat(shiftdim(scr,-1),[length(costs),1,1]); if nspi && nspj for i=2:nspi+1 for j=2:nspj+1 scr(:,i,j)=min(cat(3,scr(:,i-1,j)+1,scr(:,i,j-1)+1,scr(:,i-1,j-1)+costs'*abs(tli(i-1)-tlj(j-1))),[],3); end end end d=scr(:,nspi+1,nspj+1);