[英]Get the column name and assign as value in unlisted column in the dataframe using r
我有看起來像這樣的數據框:
negative positive
1: enjoyed
2: hate famous,helpful
3: forget,poor
4: hate enjoyed, kind
我想將其轉換成這樣的東西:
text sentiment
1 hate negative
2 forget negative
3 poor negative
4 enjoyed positive
5 famous positive
6 helpful positive
7 kind positive
感謝您的幫助。
怎么樣:
df0 <- data.frame(
negative = c("", "hate", "forget,poor", "hate"),
positive = c("enjoyed", "famous,helpful", "", "enjoyed, kind"),
stringsAsFactors = FALSE
)
values <- sapply(df0, function(x) unique(trimws(unlist(strsplit(x, ",")))))
df1 <- data.frame(
text = unlist(values),
sentiment = rep(c("negative", "positive"), lengths(values)),
row.names = NULL
)
df1
請注意,我使用stringsAsFactors = FALSE
,如果變量是因素,則必須首先將其轉換為字符串。
您可以嘗試這樣的事情:
# create testdat
test_data <- data.frame(negative = c("", "hate", "forget, poor", "hate"), positive = c("enjoyed", "famous, helpful", "", "enjoyed, kind"), stringsAsFactors = F)
#extract positive and negative colum and split along ", "
neg <- unique(unlist(strsplit(test_data$negative, ", ")))
pos <- unique(unlist(strsplit(test_data$positive, ", ")))
# combine neg and positive into a dataframe and add the sentiment column
combined <- data.frame(text = c(pos, neg), sentiment = c(rep("positive", length(pos)), rep("negative", length(neg))))
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