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[英]Paste all strings stored in a vector into a single string, this for each string vectors in a list
[英]How do I select the longest string from each vector of strings in a list of vectors?
我有一個包含字符串的向量列表,我正在嘗試獲取一個向量列表,該列表僅包含每個向量中最長的單個字符串。
例子:
我有的:
[[1]]
[1] "The quick brown fox"
[2] "jumps over the"
[3] "lazy dog"
[[2]]
[1] "She's a grand old flag"
[2] "She's a high-flying flag"
[3] "And forever in peace may she wave"
我想要的是:
[[1]]
[1] "The quick brown fox"
[[2]]
[1] "And forever in peace may she wave"
我嘗試了一些 sapply 和 nchar 的組合,但似乎無法弄清楚。 我在想我可能需要編寫某種循環? 我對 R 很陌生,所以任何建議都會有很大幫助。 謝謝你。
你可以試試:
lapply(lst, function(x) x[which.max(nchar(x))])
[[1]]
[1] "The quick brown fox"
[[2]]
[1] "And forever in peace may she wave"
下面將處理兩個字符串長度相同且為最大長度的情況:
lapply(yourList, function(x) x[nchar(x)==max(nchar(x))])
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