出现的问题 在使用rqt工具时,报错如图所示: [ERROR] [1627898425.729156095]: Skipped loading plugin with error: XML Document '/opt/ros/melodic/share/rqt_virtual_joy/plugin.xml' has no Root Element. This likely means t
题意: 每个灯泡亮的时间为 [ 2 k t i + 1 , 2 k t i + t i ] [2kt_i+1,2kt_i+t_i] [2kti+1,2kti+ti],灭的时间为 [ 2 k t i + t i + 1 , 2 k t i + 2 ∗ t i ] [2kt_i+t_i+1,2kt_i+2*t_i] [2kti+ti+1,2kti+2∗ti],每个灯泡亮度为 a [ i
Clojure is partially a lazy language. Clojure is lazy in the way it handles its sequence types. Laziness是FP重要的特征, pure FP应该是lazy language, 比如Haskell. 当然完全的lazy带来问题是, 无法保证程序的执行顺序. 而Clojure是在实用性和pure