使用 grepl R 子集列表

Question

I'm trying to subset a list which contains dataframes:

Folkersen_IL6.txt
Folkersen_IL16.txt
Folkersen_IL1.txt
Height.txt
Met_Ile.out.txt 
etc

I've tried this with the following code:

protein <- list.txt[grepl('Folkersen', list.txt)]

This line only returns me a list of 1 (containing Folkersen_IL16.txt). How can I get a subset containing all 3 desired dataframes?

Answer 1

Try grepping the names of the list:

protein <- list.txt[grepl('Folkersen', names(list.txt))]

If the names of your list are not currently the data frame names, then just alter your script to populate your list using the data frame names as you add each element.

Answer 2

Another option is startsWith

protein <- list.txt[startsWith(names(list.txt), 'Folkersen')]