我有一个包含a,b和c列的数据框.我想在b和c之间添加一个新列d.我知道我可以通过使用cbind在最后添加d但是如何将它插入两列之间？
我有如下数据:
nnn <- structure(list(JulDay = c(260.0208435, 260.0416565, 260.0625,
260.0833435, 260.1041565, 260.125), i46j8k1 = c(17.99964905,
18.5903511, 22.93223381, 25.75687981, 25.78559113, 25.8169651
), i47j8k1 = c(18.36571884, 21.15985107, 24.80698013, 25.75730324,
25.78366089, 25.65381622), i48j8k1 = c(18.45543289, 22.02331543,
24.99463654, 25.5712738, 25.64232635, 25.66119385), i46j8k2 = c(17.99798965,
18.60897827, 22.95389748, 25.75719261, 25.78653336, 25.81692505
), i47j8k2 = c(18.36762619, 21.17233467, 24.82248497, 25.75767899,
25.7840023, 25.64115906), i48j8k2 = c(18.45938683, 22.04619026,
24.9859066, 25.56440544, 25.63998032, 25.66089439), i46j8k3 = c(17.99430084,
17.92090797, 19.67384911, 21.70389938, 23.67287827, 24.04380417
), i47j8k3 = c(18.36631203, 19.82550049, 21.42166328, 23.76496887,
24.87460899, 25.41026688), i48j8k3 = …