I'm working on the CTABLES procedure. I'm trying to understand how PCOMPUTE
should work when multiple postcomputes intersect each other. For example,
consider the following syntax:
DATA LIST LIST NOTABLE/x y z.
WEIGHT by z.
FORMATS ALL (F1.0).
VARIABLE LEVEL x y (NOMINAL).
BEGIN DATA.
1 4 5
1 5 2
1 6 9
2 4 2
2 5 3
2 6 4
3 4 1
3 5 6
3 6 1
END DATA.
CTABLES /PCOMPUTE &a = EXPR([1] + [2])
/PCOMPUTE &b = EXPR([2] + [3])
/PCOMPUTE &c = EXPR([4] * [5])
/PCOMPUTE &d = EXPR([5] * [6])
/TABLE x BY y
/CATEGORIES VARIABLES=x [1, &a, 2, &b, 3]
/CATEGORIES VARIABLES=y [4, &c, 5, &d, 6].
Currently, in my implementation, the output is the following:
Custom Tables
╭───────────┬─────────────────────────────────────╮
│ │ y │
│ ├─────┬─────────┬─────┬─────────┬─────┤
│ │ 4 │[4] * [5]│ 5 │[5] * [6]│ 6 │
│ ├─────┼─────────┼─────┼─────────┼─────┤
│ │Count│ Count │Count│ Count │Count│
├───────────┼─────┼─────────┼─────┼─────────┼─────┤
│x 1 │ 5│ 10│ 2│ 18│ 9│
│ [1] + [2]│ 7│ .│ 5│ .│ 13│
│ 2 │ 2│ 6│ 3│ 12│ 4│
│ [2] + [3]│ 3│ .│ 9│ .│ 5│
│ 3 │ 1│ 6│ 6│ 6│ 1│
╰───────────┴─────┴─────────┴─────┴─────────┴─────╯
Notice the cells with "." in them where the PCOMPUTEs intersect. I don't
know what should go in those boxes. Consider the upper-left one, where [1]
+ [2] intersects with [4] * [5]. If we follow the rule for [1] + [2], then
we'd have 10 + 6 = 16 there. If we follow the rule for [4] * [5], we'd
have 7 * 5 = 35 there. Is leaving it missing the right thing to do? Am I
misunderstanding something?
