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Hi, Is there a command to get the indices of intersecting elements of two vectors as intersect() will give the elements and not its indices. Thanks in advance. Praveen Surendran School of Medicine and Medical Sciences University College Dublin Belfield, Dublin 4 Ireland. [[alternative HTML version deleted]]

...rt here)or weekend (I use 'Wkend' for short here). I want to seperate the index of the working days and weekends for each season. I used R commend "which" before for one criteria, for example, if I use... WdIndex<-which(Calender$Day=='Wd') that will gives a set of indeices of working days in the year. I wonder in R could I use a combination of something such as 'AND' , 'OR' (e.g. in MySQL) to set 'multi-criteria' when selecting data. So for example... WinterWdIndex<-which(Calender$Day=='Wd' AND Calender$Season=="Winter&quo...