From 48de574e3c95866cab83d07344ae788dc427ebe7 Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Sat, 6 May 2006 20:34:40 +0000 Subject: [PATCH] Remove notes that are no longer interesting. --- TODO | 110 +---------------------------------------------------------- 1 file changed, 1 insertion(+), 109 deletions(-) diff --git a/TODO b/TODO index 2b234028..13c3fa9c 100644 --- a/TODO +++ b/TODO @@ -1,4 +1,4 @@ -Time-stamp: <2006-05-06 11:38:03 blp> +Time-stamp: <2006-05-06 13:34:32 blp> Procedure processing: @@ -76,114 +76,6 @@ whatever) for it. Then read the /FILE and use the index to match to each case. OTOH, if the /TABLE is too large, then do it the old way, complaining if either file is not sorted on key. ----------------------------------------------------------------------- -Statistical procedures: - -For each case we read from the input program: - -1. Execute permanent transformations. If these drop the case, stop. -2. N OF CASES. If we have already written N cases, stop. -3. Write case to replacement active file. -4. Execute temporary transformations. If these drop the case, stop. -5. Post-TEMPORARY N OF CASES. If we have already analyzed N cases, stop. -6. FILTER. If this drops the case, stop. -7. Pass case to procedure. - -Ugly cases: - -LAG records cases in step 3. - -AGGREGATE: When output goes to an external file, this is just an ordinary -procedure. When output goes to the active file, step 3 should be skipped, -because AGGREGATE creates its own case sink and writes to it in step 7. Also, -TEMPORARY has no effect and we just cancel it. Regardless of direction of -output, we should not implement AGGREGATE through a transformation because that -will fail to honor FILTER, N OF CASES. - -ADD FILES: Essentially an input program. It silently cancels unclosed LOOPs -and DO IFs. If the active file is used for input, then runs EXECUTE (if there -are any transformations) and then steals vfm_source and encapsulates it. If -the active file is not used for input, then it cancels all the transformations -and deletes the original active file. - -CASESTOVARS: ??? - -FLIP: - -MATCH FILES: Similar to AGGREGATE. This is a procedure. When the active file -is used for input, it reads the active file; otherwise, it just cancels all the -transformations and deletes the original active file. Step 3 should be -skipped, because MATCH FILES creates its own case sink and writes to it in step -7. TEMPORARY is not allowed. - -MODIFY VARS: - -REPEATING DATA: - -SORT CASES: - -UPDATE: same as ADD FILES. - -VARSTOCASES: ??? ----------------------------------------------------------------------- -N OF CASES - - * Before TEMPORARY, limits number of cases sent to the sink. - - * After TEMPORARY, limits number of cases sent to the procedure. - - * Without TEMPORARY, those are the same cases, so it limits both. - -SAMPLE - - * Sample is just a transformation. It has no special properties. - -FILTER - - * Always selects cases sent to the procedure. - - * No effect on cases sent to sink. - - * Before TEMPORARY, selection is permanent. After TEMPORARY, - selection stops after a procedure. - -SPLIT FILE - - * Ignored by AGGREGATE. Used when procedures write matrices. - - * Always applies to the procedure. - - * Before TEMPORARY, splitting is permanent. After TEMPORARY, - splitting stops after a procedure. - -TEMPORARY - - * TEMPORARY has no effect on AGGREGATE when output goes to the active file. - - * SORT CASES, ADD FILES, RENAME VARIABLES, CASESTOVARS, VARSTOCASES, - COMPUTE with a lag function cannot be used after TEMPORARY. - - * Cannot be used in DO IF...END IF or LOOP...END LOOP. - - * FLIP ignores TEMPORARY. All transformations become permanent. - - * MATCH FILES and UPDATE cannot be used after TEMPORARY if active - file is an input source. - - * RENAME VARIABLES is invalid after TEMPORARY. - - * WEIGHT, SPLIT FILE, N OF CASES, FILTER apply only to - the next procedure when used after TEMPORARY. - -WEIGHT - - * Always applies to the procedure. - - * Before TEMPORARY, weighting is permanent. After TEMPORARY, - weighting stops after a procedure. - - -------------------------------------------------------------------------------- Local Variables: mode: text fill-column: 79 -- 2.30.2