我在r中一个数据帧和我子集成两个:从另一个数据框中选择具有相同特征的元素?
p<-c(3.14,3.56,7.45,8.33,5.44,3.12,3.78,7.62,9.12,4.34,6.78,8.65,6.99)
n<-c("mQTL","mQTL","null","null","null","null","null","null","null","null","null","null","null")
s<-c(2,2,1,2,1,1,2,2,2,1,2,1,2)
g<-c("female","male","female","male","female","female","male","female","female","male","female","female","female")
df<-data.frame(n,g,s,p)
df
mQTL<-subset(df,df$n=='mQTL')
mQTL
n g s p
1 mQTL female 2 3.14
2 mQTL male 2 3.56
null<-subset(df,df$n=="null")
空
n g s p
3 null female 1 7.45
4 null male 2 8.33
5 null female 1 5.44
6 null female 1 3.12
7 null male 2 3.78
8 null female 2 7.62
9 null female 2 9.12
10 null male 1 4.34
11 null female 2 6.78
12 null female 1 8.65
13 null female 2 6.99
我想随机搜索从空两个元件,其中每个的它们匹配基于性别(df $ g)和数量(df $ s)的两个mQTL
例如,我想有这样的事情第一个随机画
n g s p
null female 2 7.62
null male 2 3.78
第二随机画
n g s p
null female 2 9.12
null male 2 3.78
我想随机得出这样的5倍,例如,得到5不同的组合
我试图
null[which((mQTL$g==null$g)& (mQTL$s==null$s)),]
,但它给了我一个datafram所有的人都没有两届组合电子
n g s p
4 null male 2 8.33
9 null female 2 9.12
11 null female 2 6.78
13 null female 2 6.99
我不明白。为什么8.33会用于男性排 – Crt
我编了一些数据,你不需要解释实际值。我的实际数据帧比这个大得多。实际上,我有4000个mQTL从null(10000行)中抽样。我希望他们每个人都有基于'性别'和'数字'(s专栏)的相同功能。但我想从null中随机选择4000,他们只需要具有相同的功能(标准)! – dizue
您可能想阅读http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example/28481250#28481250重现您的示例有点痛苦,因为您拥有它这里。 – Frank