摘要
<正>Dear editor,Iterative learning control(ILC)has a wellestablished research history,as shown in[1,2].By generating a correct control signal from the previous control execution,it can achieve perfect tracking performance on a finite time interval.In the process of ILC design,the D-type[1]and P-type learning schemes[2]are often used to obtain good tracking performance and are applied,respectively,to irregular systems(without direct transmission from inputs to outputs)[1]and regular systems(with direct transmission from inputs to outputs)[2].
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