[英]Subset a dataframe based on other vector
Here is my question, the first data frame is output inside a function which would be applied to bigger dataframe2, to subset it. 这是我的问题,第一个数据帧在函数内部输出,该函数将应用于更大的dataframe2并对其进行子集化。
# dataframe1
loc <- c(paste('Loc', 1:9, sep = ''))
qit <- c(13, 27, 16, 14, 15, 21, 12, 11, 8)
mydf <- data.frame(loc, qit)
loc qit
1 Loc1 13
2 Loc2 27
3 Loc3 16
4 Loc4 14
5 Loc5 15
6 Loc6 21
7 Loc7 12
8 Loc8 11
9 Loc9 8
#dataframe 2
loc <- c(paste('Loc', 1:9, sep = ''))
vloc <- c(rep(loc, each=2))
allele <- c(
13, 12, 27, 20, 16, 18,
14, 17, 15, 22, 21, 26,
12, 14, 11, 18, 8, 24
)
afreq <- c( 0.308, 0.4, 0.041, 0.5, 0.125, 0.5,
0.139, 0.2, 0.219, 0.2,0.176, 0.33,
0.358, 0.4, 0.274, 0.5, 0.173, 0.15)
loctab <- data.frame(vloc, allele, afreq)
vloc allele afreq
1 Loc1 13 0.308
2 Loc1 12 0.400
3 Loc2 27 0.041
4 Loc2 20 0.500
5 Loc3 16 0.125
6 Loc3 18 0.500
7 Loc4 14 0.139
8 Loc4 17 0.200
9 Loc5 15 0.219
10 Loc5 22 0.200
11 Loc6 21 0.176
12 Loc6 26 0.330
13 Loc7 12 0.358
14 Loc7 14 0.400
15 Loc8 11 0.274
16 Loc8 18 0.500
17 Loc9 8 0.173
18 Loc9 24 0.150
What I want to make new dataframe like mydf with additional afreq variable from dataframe2. 我想用dataframe2中的其他afreq变量制作像mydf这样的新数据框。 I tried to subset it:
我试图将其子集化:
loctab[loctab$allele %in% mydf$qit, ]
vloc allele afreq
1 Loc1 13 0.308
2 Loc1 12 0.400
3 Loc2 27 0.041
5 Loc3 16 0.125
7 Loc4 14 0.139
9 Loc5 15 0.219
11 Loc6 21 0.176
13 Loc7 12 0.358
14 Loc7 14 0.400
15 Loc8 11 0.274
17 Loc9 8 0.173
I did not get what I want. 我没有得到我想要的。 Here subset doesnot care about the vloc or loc variable.
在这里,子集不在乎vloc或loc变量。 In this whenever it gets a match for all values in qit, will subset it.
在这种情况下,只要它与qit中的所有值都匹配,就会对其进行子集化。 Is there anyway to subset by putting reference to loc or vloc.
无论如何,通过引用loc或vloc来子集化。
Maybe the merge()
function is what you're looking for: 也许您正在寻找
merge()
函数:
mydf2 <- merge(mydf,loctab,by.x = "qit", by.y = "allele")
You end up with 4 columns, but can then just get rid of the extra "vloc"
column. 您最终得到了4列,但随后就可以摆脱多余的
"vloc"
列。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.