Hi, As mostly everything for my class work is handled through org-mode, I am trying to use it also for tracking attendance. And it almost works (given my quite-probably-wrong way to solve it) — Can you help me pinpoint what am I doing wrong?
In case it's not obvious, I'm a complete Lisp newbie. My attendance tables look similar to: #+CAPTION: Attendances for April |---------+-------------------+---+---+---+---+----+-------| | Account | Name | 1 | 3 | 5 | 8 | 10 | Total | |---------+-------------------+---+---+---+---+----+-------| | 1234 | Cárdenas, Lázaro | X | | X | X | | 3 | | 5678 | Madero, Francisco | X | X | X | X | | 4 | | 1544 | Villa, Pancho | | | | | | 1 | | 0113 | Zapata, Emiliano | | X | X | | | 2 | |---------+-------------------+---+---+---+---+----+-------| | Day avg | 2.25 | 2 | 2 | 3 | 2 | 1 | 2.50 | |---------+-------------------+---+---+---+---+----+-------| #+tblfm: @2$8..@5$8='(length '($3..$7))::@6$2=vmean($3..$7);%.2f::@6$3..@6$7='(length '(@2..@5))::@6$8=vmean(@2..@5);%.2f The formula tries to fill all of the numeric values (last row and column), but has two important bugs. First, the (attempted) logic: - Last column includes the sum of nonempty cells. I did this by counting the vector's length — But, as you can see, Pancho Villa lives up to his rebel's name and has consistently failed to come to class. Still, his entry shows he attended once. Digging a bit, I found (via M-:) that while (vconcat "X" nil "X" "X") yields a three element vector [88 88 88], and (vconcat nil nil nil) correctly yields an empty vector []. Getting the length of [] correctly gives 0. So, I must be doing something wrong. Can you spot it? - This same problem happens of course, getting the daily averages — We haven't yet reached April 10, but it shows one attendance. So, is there a way to unb0rk my lists? Org-mode seems to be quite well equiped for this task, and I'd hate to use other tools if I can stick to this :)
