Извлечение значений из вложенных фреймов данных в R - PullRequest
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Извлечение значений из вложенных фреймов данных в R

0 голосов
/ 02 апреля 2020

У меня есть этот список в R, образованный тремя элементами: 

df <- structure(list(`[{"code":"B1182","description":"Tire pressure monitor module","faultInformations":[{"description":"---"},{"description":"TRUE","description_eng":"TRUE","description_fre":"TRUE","description_ger":"TRUE","description_spa":"TRUE","description_ita":"TRUE","description_tur":"TRUE"}],"freezeFrames":[],"enhancedDtcInfos":[],"status":"ACTIVE","system":"MULTIFUNCTION","systemMeta":{"systemName":null,"subSystemName":null},"description_eng":"Tire pressure monitor module","description_fre":"Module de surveillance de la pression des pneus","description_ger":"Reifendrucküberwachung","description_spa":"Módulo de control de la presión de los neumáticos","description_ita":"Modulo monitor di pressione pneumatico","description_tur":"Lastik basıncı izleme modülü"},{"code":"B124D","description":"Sensor, tyre pressure","faultInformations":[{"description":"---"},{"description":"TRUE","description_eng":"TRUE","description_fre":"TRUE","description_ger":"TRUE","description_spa":"TRUE","description_ita":"TRUE","description_tur":"TRUE"}],"freezeFrames":[],"enhancedDtcInfos":[],"status":"ACTIVE","system":"MULTIFUNCTION","systemMeta":{"systemName":null,"subSystemName":null},"description_eng":"Sensor, tyre pressure","description_fre":"Capteur, pression des pneus","description_ger":"Sensor Reifendruck","description_spa":"Sensor de presión del neumático","description_ita":"Sensore, pressione pneumatici","description_tur":"Sensör, lastik hava basıncı"}]` = c("B1182", 
"B124D"), `[{"code":"B1182","description":"Tire pressure monitor module","faultInformations":[{"description":"---"},{"description":"TRUE","description_eng":"TRUE","description_fre":"TRUE","description_ger":"TRUE","description_spa":"TRUE","description_ita":"TRUE","description_tur":"TRUE"}],"freezeFrames":[],"enhancedDtcInfos":[],"status":"ACTIVE","system":"MULTIFUNCTION","systemMeta":{"systemName":null,"subSystemName":null},"description_eng":"Tire pressure monitor module","description_fre":"Module de surveillance de la pression des pneus","description_ger":"Reifendrucküberwachung","description_spa":"Módulo de control de la presión de los neumáticos","description_ita":"Modulo monitor di pressione pneumatico","description_tur":"Lastik basıncı izleme modülü"},{"code":"B124D","description":"Sensor, tyre pressure","faultInformations":[{"description":"---"},{"description":"TRUE","description_eng":"TRUE","description_fre":"TRUE","description_ger":"TRUE","description_spa":"TRUE","description_ita":"TRUE","description_tur":"TRUE"}],"freezeFrames":[],"enhancedDtcInfos":[],"status":"ACTIVE","system":"MULTIFUNCTION","systemMeta":{"systemName":null,"subSystemName":null},"description_eng":"Sensor, tyre pressure","description_fre":"Capteur, pression des pneus","description_ger":"Sensor Reifendruck","description_spa":"Sensor de presión del neumático","description_ita":"Sensore, pressione pneumatici","description_tur":"Sensör, lastik hava basıncı"}]` = c("B1182", 
"B124D"), `[{"code":"B1182","description":"Tire pressure monitor module","faultInformations":[{"description":"---"},{"description":"TRUE","description_eng":"TRUE","description_fre":"TRUE","description_ger":"TRUE","description_spa":"TRUE","description_ita":"TRUE","description_tur":"TRUE"}],"freezeFrames":[],"enhancedDtcInfos":[],"status":"ACTIVE","system":"MULTIFUNCTION","systemMeta":{"systemName":null,"subSystemName":null},"description_eng":"Tire pressure monitor module","description_fre":"Module de surveillance de la pression des pneus","description_ger":"Reifendrucküberwachung","description_spa":"Módulo de control de la presión de los neumáticos","description_ita":"Modulo monitor di pressione pneumatico","description_tur":"Lastik basıncı izleme modülü"},{"code":"B124D","description":"Sensor, tyre pressure","faultInformations":[{"description":"---"},{"description":"TRUE","description_eng":"TRUE","description_fre":"TRUE","description_ger":"TRUE","description_spa":"TRUE","description_ita":"TRUE","description_tur":"TRUE"}],"freezeFrames":[],"enhancedDtcInfos":[],"status":"ACTIVE","system":"MULTIFUNCTION","systemMeta":{"systemName":null,"subSystemName":null},"description_eng":"Sensor, tyre pressure","description_fre":"Capteur, pression des pneus","description_ger":"Sensor Reifendruck","description_spa":"Sensor de presión del neumático","description_ita":"Sensore, pressione pneumatici","description_tur":"Sensör, lastik hava basıncı"}]` = c("B1182", 
"B124D")), .Names = c("[{\"code\":\"B1182\",\"description\":\"Tire pressure monitor module\",\"faultInformations\":[{\"description\":\"---\"},{\"description\":\"TRUE\",\"description_eng\":\"TRUE\",\"description_fre\":\"TRUE\",\"description_ger\":\"TRUE\",\"description_spa\":\"TRUE\",\"description_ita\":\"TRUE\",\"description_tur\":\"TRUE\"}],\"freezeFrames\":[],\"enhancedDtcInfos\":[],\"status\":\"ACTIVE\",\"system\":\"MULTIFUNCTION\",\"systemMeta\":{\"systemName\":null,\"subSystemName\":null},\"description_eng\":\"Tire pressure monitor module\",\"description_fre\":\"Module de surveillance de la pression des pneus\",\"description_ger\":\"Reifendrucküberwachung\",\"description_spa\":\"Módulo de control de la presión de los neumáticos\",\"description_ita\":\"Modulo monitor di pressione pneumatico\",\"description_tur\":\"Lastik basıncı izleme modülü\"},{\"code\":\"B124D\",\"description\":\"Sensor, tyre pressure\",\"faultInformations\":[{\"description\":\"---\"},{\"description\":\"TRUE\",\"description_eng\":\"TRUE\",\"description_fre\":\"TRUE\",\"description_ger\":\"TRUE\",\"description_spa\":\"TRUE\",\"description_ita\":\"TRUE\",\"description_tur\":\"TRUE\"}],\"freezeFrames\":[],\"enhancedDtcInfos\":[],\"status\":\"ACTIVE\",\"system\":\"MULTIFUNCTION\",\"systemMeta\":{\"systemName\":null,\"subSystemName\":null},\"description_eng\":\"Sensor, tyre pressure\",\"description_fre\":\"Capteur, pression des pneus\",\"description_ger\":\"Sensor Reifendruck\",\"description_spa\":\"Sensor de presión del neumático\",\"description_ita\":\"Sensore, pressione pneumatici\",\"description_tur\":\"Sensör, lastik hava basıncı\"}]", 
"[{\"code\":\"B1182\",\"description\":\"Tire pressure monitor module\",\"faultInformations\":[{\"description\":\"---\"},{\"description\":\"TRUE\",\"description_eng\":\"TRUE\",\"description_fre\":\"TRUE\",\"description_ger\":\"TRUE\",\"description_spa\":\"TRUE\",\"description_ita\":\"TRUE\",\"description_tur\":\"TRUE\"}],\"freezeFrames\":[],\"enhancedDtcInfos\":[],\"status\":\"ACTIVE\",\"system\":\"MULTIFUNCTION\",\"systemMeta\":{\"systemName\":null,\"subSystemName\":null},\"description_eng\":\"Tire pressure monitor module\",\"description_fre\":\"Module de surveillance de la pression des pneus\",\"description_ger\":\"Reifendrucküberwachung\",\"description_spa\":\"Módulo de control de la presión de los neumáticos\",\"description_ita\":\"Modulo monitor di pressione pneumatico\",\"description_tur\":\"Lastik basıncı izleme modülü\"},{\"code\":\"B124D\",\"description\":\"Sensor, tyre pressure\",\"faultInformations\":[{\"description\":\"---\"},{\"description\":\"TRUE\",\"description_eng\":\"TRUE\",\"description_fre\":\"TRUE\",\"description_ger\":\"TRUE\",\"description_spa\":\"TRUE\",\"description_ita\":\"TRUE\",\"description_tur\":\"TRUE\"}],\"freezeFrames\":[],\"enhancedDtcInfos\":[],\"status\":\"ACTIVE\",\"system\":\"MULTIFUNCTION\",\"systemMeta\":{\"systemName\":null,\"subSystemName\":null},\"description_eng\":\"Sensor, tyre pressure\",\"description_fre\":\"Capteur, pression des pneus\",\"description_ger\":\"Sensor Reifendruck\",\"description_spa\":\"Sensor de presión del neumático\",\"description_ita\":\"Sensore, pressione pneumatici\",\"description_tur\":\"Sensör, lastik hava basıncı\"}]", 
"[{\"code\":\"B1182\",\"description\":\"Tire pressure monitor module\",\"faultInformations\":[{\"description\":\"---\"},{\"description\":\"TRUE\",\"description_eng\":\"TRUE\",\"description_fre\":\"TRUE\",\"description_ger\":\"TRUE\",\"description_spa\":\"TRUE\",\"description_ita\":\"TRUE\",\"description_tur\":\"TRUE\"}],\"freezeFrames\":[],\"enhancedDtcInfos\":[],\"status\":\"ACTIVE\",\"system\":\"MULTIFUNCTION\",\"systemMeta\":{\"systemName\":null,\"subSystemName\":null},\"description_eng\":\"Tire pressure monitor module\",\"description_fre\":\"Module de surveillance de la pression des pneus\",\"description_ger\":\"Reifendrucküberwachung\",\"description_spa\":\"Módulo de control de la presión de los neumáticos\",\"description_ita\":\"Modulo monitor di pressione pneumatico\",\"description_tur\":\"Lastik basıncı izleme modülü\"},{\"code\":\"B124D\",\"description\":\"Sensor, tyre pressure\",\"faultInformations\":[{\"description\":\"---\"},{\"description\":\"TRUE\",\"description_eng\":\"TRUE\",\"description_fre\":\"TRUE\",\"description_ger\":\"TRUE\",\"description_spa\":\"TRUE\",\"description_ita\":\"TRUE\",\"description_tur\":\"TRUE\"}],\"freezeFrames\":[],\"enhancedDtcInfos\":[],\"status\":\"ACTIVE\",\"system\":\"MULTIFUNCTION\",\"systemMeta\":{\"systemName\":null,\"subSystemName\":null},\"description_eng\":\"Sensor, tyre pressure\",\"description_fre\":\"Capteur, pression des pneus\",\"description_ger\":\"Sensor Reifendruck\",\"description_spa\":\"Sensor de presión del neumático\",\"description_ita\":\"Sensore, pressione pneumatici\",\"description_tur\":\"Sensör, lastik hava basıncı\"}]"
))

Когда я print(df) Я вижу: 

$...
[1] "B1182" "B124D"

$...
[1] "B1182" "B124D"

$...
[1] "B1182" "B124D"

Вы можете заметить, что это вложенный и список, полученный при извлечении поля с .

В любом случае, Я хотел бы преобразовать это результат в кадре данных, образованном тремя строками. Кроме того, я хотел бы удалить всю дополнительную информацию и сохранить исключительно предыдущие коды. Как я могу это сделать?

Благодарим вас за помощь.

РЕДАКТИРОВАТЬ

Мой оригинальный df содержит более 2000 элементов в списке. Не все из этих элементов имеют два значения, некоторые из них не имеют ни одного, а другие имеют более двух.

Представьте, что я печатаю шесть элементов (вместо трех, как раньше) с таким выводом: 

$...
[1] "B1182" "B124D"

$...
[1] "B1182" "B124D"

$...
[1] "B1182" "B124D"

$`[]`
NULL

$...
[1] "B1182" "B124D" "B365A"

$...
[1] "B1182" "B124D"

Вот код, полученный после выполнения dput() для первых двадцати элементов списка: 

df <- list(c("B1182", "B124D"), c("B1182", "B124D"), c("B1182", "B124D"
), c("B1182", "B124D"), c("B1182", "B124D"), c("B1182", "B124D"
), c("B1182", "B124D"), c("B1182", "B124D"), NULL, NULL, c("B1182", 
"B124D"), c("B1182", "B124D"), c("B1182", "B124D"), NULL, NULL, 
    NULL, NULL, c("P2000", "P2000", "U3003", "P2000"), c("P2000", 
    "P2000", "U3003", "P2000"), NULL)

Как мы можем действовать в этом более сложном случае?

1 Ответ

1 голос
/ 02 апреля 2020

Поскольку имена огромны, мы можем удалить имена, затем заменить элементы NULL на NA и связать данные в строке. 

names(df) <- NULL
df[sapply(df, is.null)] <- NA
dplyr::bind_rows(lapply(df, function(x) 
         as.data.frame(t(x), stringsAsFactors = FALSE)))

#      V1    V2    V3    V4
#1  B1182 B124D  <NA>  <NA>
#2  B1182 B124D  <NA>  <NA>
#3  B1182 B124D  <NA>  <NA>
#4  B1182 B124D  <NA>  <NA>
#5  B1182 B124D  <NA>  <NA>
#6  B1182 B124D  <NA>  <NA>
#...
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