按照书上的例子
<br />
library(gcookbook)<br />
library(plyr)<br />
library(ggplot2)<br />
ce<- ddply(cabbage_exp,"Date",transform,percent_weight=Weight/sum(Weight)*100);ce<br />
[data]<br />
Cultivar Date Weight sd n se percent_weight<br />
1 c39 d16 3.18 0.9566144 10 0.30250803 58.45588<br />
2 c52 d16 2.26 0.4452215 10 0.14079141 41.54412<br />
3 c39 d20 2.80 0.2788867 10 0.08819171 47.37733<br />
4 c52 d20 3.11 0.7908505 10 0.25008887 52.62267<br />
5 c39 d21 2.74 0.9834181 10 0.31098410 65.08314<br />
6 c52 d21 1.47 0.2110819 10 0.06674995 34.91686<br />
[/data]<br />
ggplot(ce,aes(x=Date,y=percent_weight),fill=Cultivar)+geom_bar(stat="identity",width=0.5)<br />
明明fill参数已经有了，为什么做出的图还是黑魆魆的三根柱子呢？
</p>
