fld = fieldnames(variable); %list of all field names.. data1, data2,data3...
for i = 1:numel(fld) % for each field name
m = variable.(fld{i}); %this will be the data1,data2,data3 matrix
pos = m(:,2);%index matrix for position
vel = m(:,3); %velocity
plot(pos,vel); %plot results
hold on; % keep plot for next plot
end
