Hi J'ers, I'm trying to write a verb that will match the items in Source with Target and return the index of items in Target such that they are in the same order as Source with nulls (or the J way of handling nulls) if no match is found.
This is what i have (and it's wrong): Source =. 'a';'bcd';'e';'g' Target =. 'e';'a';'bcd';'f' getIndex =: e. shouldReturn =. 1 2 0 null assert (Source getIndex Target)=shouldReturn In the forums I've found solution candidates,but haven't been able to apply them and am a bit lost with: I.@:E. and ;: The concept of expressing null or missing data in J I haven't found much info on. Where can i find more information on nulls. Much Thanks -Joe ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
