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r - change list elements in R

问题描述

I have a list test_list:

a = c("name1:type", "name2:132", "445", "556")
b = c("name1:type", "name2:132", "125", "-6")
test_list = list(a, b)

The original test_list is:

[[1]]
[1] "name1:type" "name2:132"  "445"        "556"       

[[2]]
[1] "name1:type" "name2:132"  "125"        "-6"

I want to change the name1 and name2 in the test_list to "X1", "X2".

My expected output is:

[[1]]
[1] "X1:type" "X2:132"  "445"        "556"       

[[2]]
[1] "X1:type" "X2:132"  "125"        "-6"

Thanks.

标签： rlist

解决方案

One option could be:

lapply(test_list, function(x) sub("name", "X", x))

[[1]]
[1] "X1:type" "X2:132"  "445"     "556"    

[[2]]
[1] "X1:type" "X2:132"  "125"     "-6"

Or written as (to avoid anonymous functions):

lapply(test_list, sub, pattern = "name", replacement = "X")

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