有字符矩阵以及我如何在R中转换为数字？ 我使用几个代码，如：as.numeric（as.character（df））; lapply（df，as.numeric）; sapply（df，as.numeric）;但没有获得优势！
df[1:5,1:10]
id G_r78 G_09 G_r805 G_800
1 "02000H1" NA "1" "2" "1"
2 "02000H15" NA "0" "1" "2"
3 "02003H10" NA "1" "1" "1"
4 "02003KH8" NA "0" "1" "1"