[R] Scatterplot, Color by Grade Category

[David Arnold]

Hi,

I have:

hours=c(5,6,6,7,7,8,8,9,7,8,8,8,9,9,10,10,9,10,10,11,11,11,12);
level=c(1.0,1.2,0.8,0.8,1.0,1.0,0.6,0.8,1.4,1.2,1.4,1.6,
        1.2,1.4,1.0,1.4,1.6,1.6,1.8,1.4,1.6,1.8,1.6);
grade=c(rep("First",8),rep("Second",8),rep("Third",7))
length(hours)
length(level)
length(grade)
data=data.frame(hours=hours,level=level,grade=grade)
data
plot(data$hours,data$level)

Without using ggplot, just using core basic R, how can I:

1. Color each point according to the grade factor.

2. Select a different point type according to the grade factor.

Thanks.

D.





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