绘图matlab,画出来的不是曲线>> UN=220;PN=0.275;IaN=2.144;Nn=12100;Ra=6.952;Rf=8.24;k=0.01;CePhiN=(UN-(Ra+Rf)*IaN)/Nn;Ce=CePhiN/k/IaN;Ia=0:IaN;n=UN./(Ce*k.*Ia)-(Ra+Rf)/(Ce*k);start_p=1;Ia_p=Ia(start_p:length(Ia));n_p=n(start_p:length(n));CTPh

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