将类型因素更改为数字而不会丢失＆＃34;。＆＃34;

Question

我只是在学习R，并试图在我的数据集中总结两个vaiables。我已将Hits和Runs更改为从type factor键入numeric而不会丢失任何信息，除了4＆＃34;。＆＃34;应该留下的价值＆＃34;。＆＃34;但改为＆＃34; NA＆＃34;。我附上了我的代码段和数据集样本

 gamestats<-read.fwf(paste0(dirdata,"Games_Plus.dat"), width= widths, col.names = colNames, na.strings = ".", stringsAsFactors = FALSE)
gamestats$Hits <- as.numeric(as.character(gamestats$Hits))
gamestats$Runs <- as.numeric(as.character(gamestats$Runs))

6-19 Peaches      8  3 Complete
6-20 Peaches     10  5 Complete
6-23 Plains       3  4 Complete
6-24 Plains       7  2 Complete
6-25 Plains       12  8 Complete
6-30 Gilroy        .  . No Data
7-1  Gilroy        .  . No Data
7-4  Sacramento   15  9 Complete
7-4  Sacramento   10 10 Complete
7-5  Sacramento    2  3 Complete