我有这个数据框架
df = data.frame(x = c('01','02','03','04','05'))
df
目标是得到如下输出:
x
1 1
2 2
3 3
4 4
5 5
使用
df$x <- as.integer(df$x)
javascript python java c# php android html jquery c++ css ios sql mysql arrays asp.net json python-3.x ruby-on-rails .net sql-server django objective-c excel regex ruby linux ajax iphone xml vba spring asp.net-mvc database wordpress string postgresql wpf windows xcode bash git oracle list vb.net multithreading eclipse algorithm macos powershell visual-studio image forms numpy scala function api selenium