How to extract a dataframe which is within a list in r, using a condition?

问题

I have a list which has dataframes of various dimensions. I want to extract those dataframes who rows greater than 30 I tried :

DR<-sapply(list, function(x) subset(list,nrow(list$'x')=30))

But it is showing error. Please help!

回答1:

Assuming your list is called list_df, we can use Filter

Filter(function(x) nrow(x) == 30, list_df)

Or sapply

list_df[sapply(list_df, nrow) == 30]

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We can also use purrr::keep

purrr::keep(list_df, ~nrow(.) == 30)

来源：https://stackoverflow.com/questions/58850863/how-to-extract-a-dataframe-which-is-within-a-list-in-r-using-a-condition