negative indices to take/drop Doug Evans 04 Jan 1999 20:16 UTC
>From: "Harvey J. Stein" <email@example.com> >Date: Mon, 4 Jan 1999 12:35:21 +0200 > >III. take & drop. > >Again, I agree with Sergei that it is strange to count from the end >when the index argument is negative. Depends on how akin you are to APL. :-) >Does anyone have any examples >where this would be much more convenient than having 2 sets of fcns - >one for counting from the beginning & one for counting from the end? >I don't see any continuity reasons for thinking that (take l -1) >should be a list containing the last element of l. One comment I have is that the document doesn't specify what happens with over-take or over-drop (> (abs n) (length l)).