Question

我有两个名称存储在其中的变量。我想看看变量ScanName中有多少名字在向量B中，而忽略了大写字母。另外，有什么区别？我想忽略搜索中大写字母之间的差异（例如，它应该考虑hsa-mir-1和hsa-miR-1相同）。我的数据是这样的：

 str(B)
 Factor w/ 1046 levels "hsa-let-7a-1",..: 1 2 3 4 5 6 7 8 9 10 ...

>B
   [1] hsa-let-7a-1     hsa-let-7a-2     hsa-let-7a-3     hsa-let-7b       hsa-let-7c       hsa-let-7d      
   [7] hsa-let-7e       hsa-let-7f-1     hsa-let-7f-2     hsa-let-7g       hsa-let-7i       hsa-mir-1-1     
  [13] hsa-miR-1238     hsa-mir-100      hsa-mir-101-1    hsa-mir-101-2    hsa-mir-103-1    hsa-mir-103-1-as
  [19] hsa-mir-103-2    hsa-mir-103-2-as hsa-mir-105-1    hsa-mir-105-2    hsa-mir-106a     hsa-mir-106b

和

> str(ScanName)
 chr [1:1146] "hsa-miR-103b" "hsa-miR-1178" "hsa-miR-1179" "hsa-miR-1180" "hsa-miR-1181
> ScanName
   [1] "hsa-miR-103b"     "hsa-miR-1178"     "hsa-miR-1179"     "hsa-miR-1180"     "hsa-miR-1181"     "hsa-miR-1182"    
   [7] "hsa-miR-1183"     "hsa-miR-1184"     "hsa-miR-1193"     "hsa-miR-1197"     "hsa-miR-1200"     "hsa-miR-1203"    
  [13] "hsa-miR-1204"     "hsa-miR-1205"     "hsa-miR-1206"     "hsa-miR-1208"     "hsa-miR-1224-3p"  "hsa-miR-1225-3p" 
  [19] "hsa-miR-1225-5p"  "hsa-miR-1227"     "hsa-miR-1228"     "hsa-miR-1229"     "hsa-miR-1231"     "hsa-miR-1233"    
  [25] "hsa-miR-1234"     "hsa-let-7a-2"     "hsa-miR-1238"     "hsa-miR-1243"     "hsa-miR-1244"     "hsa-miR-1245"    
  [31] "hsa-miR-1245b-3p" "hsa-miR-1246"     "hsa-miR-1247"     "hsa-miR-1248"     "hsa-miR-1249"     "hsa-miR-1250"    
  [37] "hsa-miR-1251"     "hsa-miR-1252"

Answer 1

你可以使用％in％和tolower

ScanName[tolower(ScanName) %in% tolower(B)]

Answer 2

您还可以grep将ignore.case参数设置为TRUE

> unlist(sapply(B, function(x){
      grep(x, ScanName, ignore.case = TRUE, value = TRUE)
      }, USE.NAMES = FALSE))
## [1] "hsa-let-7a-2" "hsa-miR-1238"

在

给出相同的结果

> ScanName[tolower(ScanName) %in% tolower(B)]
## [1] "hsa-let-7a-2" "hsa-miR-1238"

如何检查两个向量有多少不同？

2 个答案: