我正在使用 NCBI 引用序列登录号，例如变量 a:
a <- c("NM_020506.1","NM_020519.1","NM_001030297.2","NM_010281.2","NM_011419.3", "NM_053155.2")
要从 Biomart 包中获取信息，我需要删除登录号后面的 .1、.2 等。我通常使用以下代码执行此操作:
b <- sub("..*", "", a)
# [1] "" "" "" "" "" ""
但正如您所看到的，这不是该变量的正确方法。谁能帮我解决这个问题吗？
最佳答案
你只需要避开句点:
a <- c("NM_020506.1","NM_020519.1","NM_001030297.2","NM_010281.2","NM_011419.3", "NM_053155.2")
gsub("\\..*","",a)
[1] "NM_020506" "NM_020519" "NM_001030297" "NM_010281" "NM_011419" "NM_053155"
关于删除 "."之后的部分字符串，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10617702/