我有一個數據集分類分配,我想提取一個新的列中的屬。突變重複第一行值
library(tidyverse)
library(magrittr)
library(stringr)
df <- structure(list(C043 = c(18361L, 59646L, 27575L, 163L, 863L, 3319L,
0L, 6L), C057 = c(20020L, 97610L, 13427L, 1L, 161L, 237L, 2L,
105L), taxonomy = structure(c(3L, 2L, 1L, 6L, 4L, 4L, 5L, 2L), .Label = c("k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Enterobacter;NA",
"k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Enterobacter;s__cloacae",
"k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Escherichia;s__coli",
"k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Klebsiella;s__",
"k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Pseudomonadales;f__Pseudomonadaceae;g__Pseudomonas;s__",
"k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Pseudomonadales;f__Pseudomonadaceae;g__Pseudomonas;s__stutzeri"
), class = "factor")), .Names = c("C043", "C057", "taxonomy"), row.names = c(1L,
2L, 3L, 4L, 5L, 6L, 8L, 10L), class = "data.frame")
所以這是我的函數(它的工作原理)
extract_genus <- function(str){
genus <- str_split(str, pattern = ";")[[1]][6]
genus %<>% str_sub(start = 4) #%>% as.character
return(genus)
}
但是,當我應用它mutate
(有或沒有as.character
),它重複在新列第一行的值。
df %>% mutate(genus = extract_genus(taxonomy))
C043 C057 taxonomy genus
1 18361 20020 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Escherichia;s__coli Escherichia
2 59646 97610 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Enterobacter;s__cloacae Escherichia
3 27575 13427 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Enterobacter;NA Escherichia
4 163 1 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Pseudomonadales;f__Pseudomonadaceae;g__Pseudomonas;s__stutzeri Escherichia
5 863 161 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Klebsiella;s__ Escherichia
當我使用sapply
(但我不想,我想與dplyr
管道解決方案),它的工作原理。
df_group_gen$genus <- sapply(df_group_gen$taxonomy, extract_genus)
C043 C057 taxonomy genus
1 18361 20020 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Escherichia;s__coli Escherichia
2 59646 97610 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Enterobacter;s__cloacae Enterobacter
3 27575 13427 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Enterobacter;NA Enterobacter
4 163 1 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Pseudomonadales;f__Pseudomonadaceae;g__Pseudomonas;s__stutzeri Pseudomonas
5 863 161 k__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacteriales;f__Enterobacteriaceae;g__Klebsiella;s__ Klebsiella
爲什麼mutate
不能像我們預期的那樣計算?我找到這個question,但沒有提供答案,只有一個有特別代碼。
謝謝:)
矢量化函數將與mutate'extract_genus2 < - Vectorize(extract_genus)'一起使用。 –
或使用'purrr':'df%>%mutate(genus = map(taxonomy,extract_genus))'。 – Axeman