[英]Subset set a dataframe column based on first row value in R
I have a 1 row dataframe called ff. 我有一个称为ff的1行数据框。
A B C D E F
2 5 9 1 7 6
How do I create a single column dataframe (ColContribs) when the a column equals 7 当一列等于7时如何创建单列数据框(ColContribs)
E
7
Like that..? 像那样..? I was using 我在用
ColContribs <- ff[,ff[1,]==7]
but i'm getting this error 但我收到此错误
Error in Ops.data.frame(ff[1, ], ColContribs) :
‘==’ only defined for equally-sized data frames
Paul 保罗
I tried to create a similar case and it worked as below. 我试图创建一个类似的案例,它的工作原理如下。
library(tidyverse)
a <- 2
e <- 7
lol <- cbind(a,e) %>% data.frame()
ColContribs <- lol[,lol[1,]==7] %>% data.frame()
ff <- data.frame(A = 2, B = 5, C = 9, D = 1, E = 7, F = 6)
ColContribs <- ff[,ff[1,] == 7, drop = FALSE]
Because it's a single element data frame, you need to specify drop == FALSE 因为它是一个单元素数据帧,所以需要指定drop == FALSE
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