>> plot(x,y) >> plot(x,y,'g','markersize',25) >> plot(x,y,'g.','markersize',25)區別

data=nihe030501 x=data(:,1) y=data(:,2) x=x’ y=y’ plot(x,y) plot(x,y,‘g’,‘markersize’,25) plot(x,y,‘g.’,‘markersize’,25)

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