如何用r语言绘制多变量散点图答:ggplot(a)+geom_point(aes(x1,y,col=x1/x2),position=position_jitter(width=0.04))散点图 1+geom_point(aes(x1,y,col=x1/x2),stat='summary',fun='sum'/'mean')+散点 2+geom_line(aes(x1,y,group=1/x2,col=x1/x2),stat='summary',fun='sum'/'mean')+折线 3+geom_error...