R从宽到长的格式，具有三个变量

Question

我有一个数据框，想将它从宽格式更改为长格式，但我有三个变量，而 ref = RR_ref、het = RR_het 和 hom = RR_hom .

df:
Number  ref het RR_het  hom RR_hom  RR_ref
mary    GG  AG  0.29    AA  0.0841  1
wayne   AA  AG  1.7     GG  2.89    1

structure(list(Number = c("mary", "wayne"), ref = c("GG", "AA"
), het = c("AG", "AG"), RR_het = c(0.29, 1.7), hom = c("AA", 
"GG"), RR_hom = c(0.0841, 2.89), RR_ref = c(1L, 1L)), .Names = c("Number", 
"ref", "het", "RR_het", "hom", "RR_hom", "RR_ref"), class = "data.frame", row.names = c(NA, -2L))

desired output:
Name    Vars    Value
mary    GG      1
wayne   AA      1
mary    AG      0.29
wayne   AG      1.7
mary    AA      0.0841
wayne   GG      2.89

谁能帮帮我？谢谢

Answer 1

我们可以在更改列的顺序后使用 data.table 中的 melt

library(data.table)
library(gtools)
melt(setDT(df[c(names(df)[1], mixedsort(names(df)[-1]))]),
    measure = patterns("^[a-z]+$", "_"), 
    value.name = c("Vars", "Value"))[, variable := NULL][]
#   Number Vars  Value
#1:   mary   AG 0.2900
#2:  wayne   AG 1.7000
#3:   mary   AA 0.0841
#4:  wayne   GG 2.8900
#5:   mary   GG 1.0000
#6:  wayne   AA 1.0000

R从宽到长的格式，具有三个变量

R wide to long format with three variables

r

dataframe

match

reshape2

melt