Matlab Code for Spike Time Distances Between Spike
Trains
main cost-based metrics page
algorithm page for cost-based metrics
Matlab code for Spike Time Metric
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function d=spkd(tli,tlj,cost)
%
% d=spkd(tli,tlj,cost) calculates the "spike time" distance
% (Victor & Purpura 1996) for a single cost
%
% tli: vector of spike times for first spike train
% tlj: vector of spike times for second spike train
% cost: cost 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 cost==0
d=abs(nspi-nspj);
return
elseif cost==Inf
d=nspi+nspj;
return
end
scr=zeros(nspi+1,nspj+1);
%
% INITIALIZE MARGINS WITH COST OF ADDING A SPIKE
%
scr(:,1)=(0:nspi)';
scr(1,:)=(0:nspj);
if nspi & nspj
for i=2:nspi+1
for j=2:nspj+1
scr(i,j)=min([scr(i-1,j)+1 scr(i,j-1)+1 scr(i-1,j-1)+cost*abs(tli(i-1)-tlj(j-1))]);
end
end
end
d=scr(nspi+1,nspj+1);
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