ggplot中的订单栏 [英] Order bars in ggplot

问题描述

我正在ggplot中绘制一个barplot:

I am plotting a barplot in ggplot:

ggplot(fastqc.dat,aes(y=fastqc.dat$ReadCount,x=fastqc.dat$Sample)) + geom_bar(stat="identity",position="identity",fill="darkblue") + xlab("Samples") + ylab("Read Counts") + opts(axis.text.x=theme_text(angle=-90))

我的文件'fastqc.dat'看起来像这样:

My file 'fastqc.dat' looks like this:

             Sample        ReadCount
 201304950-01_ATTCAGAA_R1  27584682
 201304951-01_GAATTCGT_R1  25792086
 201304952-01_CTGAAGCT_R1  36000000
 201304953-01_GAGATTCC_R1  35634177
 201304954-01_ATTACTCG_R1  88906701

它产生以下图:

但是我想根据读取计数即Y轴重新排列条形.我尝试了很多事情，但不会发生.我什至尝试根据ReadCount列对fastqc.dat进行排序.有什么建议吗?

But I want to reorder the bars based on the read counts i.e. the Y axis. I tried a lot of things but it just won't happen. I even tried sorting fastqc.dat based on ReadCount column. Any suggestions?

推荐答案

...因此，将有用的建议汇总在一起，一种解决方案是:

... so bringing the helpful suggestions together, one solution would be:

fastqc.dat$Sample <- factor(fastqc.dat$Sample,
                            levels=fastqc.dat$Sample[order(fastqc.dat$ReadCount)])

然后使用您的代码...

and than use your code...

HTH

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