Rickyfox: Dang it how could I have missed this? Thx for the answer, I feel incredibly stupid now.
Juba: Never underestimate the power of R to make you feel stupid.
--- Rickyfox and Juba (in an exchange over how ifelse()
works) stackoverflow.com (March 2013)
我竟然没在 SO 上找到讨论的链接,求助在 SO 找资料的正确姿势?