R_3rd绘制基本的折线图

R_3rd绘制基本的折线图   > dose <-c(20,30,40,50,60) > drugA <-c(16,20,27,40,60) >  drugB <- c(15,18,25,31,40) >  opar <- par (no.readonly = TRUE) >  par(lwd = 2 , cex =1.5 ,font.lab = 2) > plot (dose,drugA,typ

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