删除“."之后的部分字符串 [英] Remove part of string after "."

问题描述

我正在使用 NCBI 参考序列登录号，例如变量 a:

I am working with NCBI Reference Sequence accession numbers like variable 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的 .1、.2 等.我通常使用以下代码执行此操作:

To get information from the biomart package I need to remove the .1, .2 etc. after the accession numbers. I normally do this with this code:

b <- sub("..*", "", a)

# [1] "" "" "" "" "" ""

但是正如你所看到的，这不是这个变量的正确方法.有人能帮我解决这个问题吗?

But as you can see, this isn't the correct way for this variable. Can anyone help me with this?

推荐答案

你只需要转义句点:

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" 

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