如何使用R語言將character(0)
轉換爲NA
?如何使用R語言將字符(0)轉換爲NA列表?
實施例:
a = list("a", "character(0)", "b", "c")
到
a = list("a", "NA", "b", "c")
感謝。
如何使用R語言將character(0)
轉換爲NA
?如何使用R語言將字符(0)轉換爲NA列表?
實施例:
a = list("a", "character(0)", "b", "c")
到
a = list("a", "NA", "b", "c")
感謝。
替換character(0)
只(假設你的意思character(0)
代替"character(0)"
):
a = list("a", character(0), "b", "c")
lapply(a, function(x) if(identical(x, character(0))) NA_character_ else x)
#[[1]]
#[1] "a"
#[[2]]
#[1] NA
#[[3]]
#[1] "b"
#[[4]]
#[1] "c"
替換所有長度爲0的元素:
a[lengths(a) == 0] <- NA_character_
a
#[[1]]
#[1] "a"
#[[2]]
#[1] NA
#[[3]]
#[1] "b"
#[[4]]
#[1] "c"
完美! TKS! – Thaise
a[a=="character(0)"] <- "NA"
鑑於您的例子,這提供你問什麼,但實際上你想要什麼有關係嗎?
像:'lapply(一個,函數(x)如果( x =='character(0)')'NA'else x)'? – MichaelChirico
它真的是一個包含短語「字符(0)」的字符串嗎? – Dason
我懷疑你給了我們錯誤的輸入,你真正想要的更像是:'lapply(a,function(x)if(!length(x)&& is.character(x))NA_character_ else x)' – MichaelChirico