= NA, miles = NA)
'mapdist(PostcodeA, PostcodeB, mode = "driving")' is not a function, character or symbol
dataset<- data.frame(lapply(dataset, as.charac
我正在处理C#项目,所以我有两个函数,如果function1已经完成,我需要函数2执行,否则函数2必须被阻止执行(不执行!)。public void SaveDuplicatCourse() if(con.State !=ConnectionState.Open) List<int> IDs = new List<int>();
foreach (DataGridViewRow r in dataGridVie