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Matlab Code/covertIdxForm.m

+function [agentIdx, trajIdx] = covertIdxForm(absIdx, Tj)
+
+agentIdx = zeros(size(absIdx));
+trajIdx = zeros(size(absIdx));
+for i=1:length(absIdx)
+    absIdxTemp = absIdx(i);
+    count = 1;
+    if absIdxTemp > Tj
+        while absIdxTemp > Tj
+            absIdxTemp = absIdxTemp - Tj;
+            count = count + 1;
+        end
+    end
+    
+    trajIdx(i) = absIdxTemp;
+    agentIdx(i) = count;
+end
+
+% agentIdx = floor((absIdx)./(Tj)); % how many traj size steps are we?
+% trajIdx = absIdx - (agentIdx-1).*Tj;
+% % agentIdx = agentIdx + 1; % must account for indexing by zero
+end
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