mathlab required engineering question

% HW_PWM_DCmotor.m file for drawing results from file: HW_PWM..... load current ia;load speed wm; ia=ia';wm=wm'; t=ia(:,1);ia1=ia(:,2);ia2=ia(:,3);wm1=wm(:,2);wm2=wm(:,3); CLF figure(1), subplot(2,1,1), plot(t,ia1,'k',t,ia2,':'),xlabel('time [s]'), ylabel('current ia [A]'),grid subplot(2,1,2),plot(t,wm1,'k',t,wm2,':'),xlabel('time [s]'), ylabel('speed wm [rad/s]'),grid,