Is "starting" a counter the same as "arming" it?
Hi everyone,
I am trying to understand why I get unexpected behavior with my VI and counter output.
I am outputting 3 single,triggered pulses: 2 on a 6602 (1 each on counters 0 and 1), and 1 on GPCTR0 on a 6071E.
The second pulse on the 6602 (on counter 1) is supposed to immediately pulse after the first pulse (on counter 0) is finished pulsing.
GPCTR0 is a pulse used to start my data acquisition, and occurs before the first pulse from the 6602.
All three counters share a common hardware trigger, a repeating 120Hz pulse, synced to some of my other hardware. This train of triggers arrive only after I switch a DIO line (on yet another card, a 6503), and this DIO line is turned on the a sequence frame after the frame in which I set up and "start" my counters (with control.vi set to "start").
Now here's the problem I encounter:
*most* of the time (~4/5 times) I get the output I want from the 6602, 1 pulse right after the other. But every once in a while, I get the pulses ~8 ms apart--that is, counters 0 and 1 are triggering off different trigger pulses in the 120Hz I send to the gates. So one of my counters is somehow missing seeing the start trigger that another counter sees.
How can this be? If all counters are already started, shouldn't the same start-trigger trigger all of the counting operations at once?!
Also problematic, every once in a while, counter 0 is missing the first hardware trigger, but triggers on the second trigger of the 120 Hz trigger pulses. So it seems my problem is that the counters are sometimes just missing seeing the triggers.
Any ideas? I posted my VI. The relevant portions are in big frame3, inner frames 3 and 5. (frame 3 configures and starts all counters. frame 5 turns on my hardware triggers).
thanks in advance for any help!
Attachments:
Neurochip-legacy.vi 698 KB
to answer my own question....
i discovered something miswired in my hardware.
so there seems to be no labview problem...
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HELLO,
I have a table t
create table t
(quiz_ID number,
class_id number,
student_id number,
score number)
SQL> select * from t
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ID ID _ID
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1 1 3 11 2 22 207Here,
Quiz_id is the respective quiz_id's in which same set (i.e same student_id's) of students participated for their class. Thus, in quiz_id = 1 and 2, student_id 12, 21 and 124 particpated for their class respectively. The quiz_ids, for which the same set of studnets appeared in the quiz, should be seperated by commas.
Count(same_set) is the no. of times the same set of students form a class appeared in a quiz.
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SUM(SCORE) is ths sum of scores all the three students in quizes in which they appeared together
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2. How many times the same set of student_ids' from both classes combined took a quiz
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(SET) (score)
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2 1 2,3 12 21 124 11 2 28 269Here,
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Count(set) is the no. of times the same set of students appeared in a quiz
Class_id is the class_id of the repective set of students,seprated by comma
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INSERT INTO T VALUES (1,2,12,34);
INSERT INTO T VALUES (1,2,21,134);
INSERT INTO T VALUES (1,2,124,0);
INSERT INTO T VALUES (1,3,11,21);
INSERT INTO T VALUES (1,3,2,99);
INSERT INTO T VALUES (1,3,22,87);
INSERT INTO T VALUES (2,2,12,7);
INSERT INTO T VALUES (2,2,21,13);
INSERT INTO T VALUES (2,2,124,42);
INSERT INTO T VALUES (2,3,11,21);
INSERT INTO T VALUES (2,3,2,99);
INSERT INTO T VALUES (2,3,28,87);Thanks in advance,
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2 from
3 (select quiz_id,
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10 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY class_id) -1 AS prev
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14 from
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17 KEEP (DENSE_RANK LAST ORDER BY curr),',') AS range_student
18 FROM (SELECT student_id,
19 quiz_id,rk,score,
20 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) AS curr,
21 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) -1 AS prev
22 FROM (select quiz_id,class_id,student_id,score,
23 dense_rank() over (order by quiz_id) rk
24 from t))
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27 START WITH curr = 1) a,
28 t b
29 where a.quiz_id=b.quiz_id))
30 group by score_rs,quiz_id, range_student
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33 (select count(*) same_set,range_student,range_class
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36 range_student,
37 LTRIM(MAX(SYS_CONNECT_BY_PATH(class_id,','))
38 KEEP (DENSE_RANK LAST ORDER BY curr),',') AS range_class
39 from
40 (select class_id,score_rs,quiz_id, range_student,rk,
41 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY class_id) AS curr,
42 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY class_id) -1 AS prev
43 from
44 (select distinct b.class_id, a.score_rs, a.quiz_id, a.range_student,
45 dense_rank() over (order by a.quiz_id) rk
46 from
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48 LTRIM(MAX(SYS_CONNECT_BY_PATH(student_id,','))
49 KEEP (DENSE_RANK LAST ORDER BY curr),',') AS range_student
50 FROM (SELECT student_id,
51 quiz_id,rk,score,
52 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) AS curr,
53 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) -1 AS prev
54 FROM (select quiz_id,class_id,student_id,score,
55 dense_rank() over (order by quiz_id) rk
56 from t))
57 GROUP BY quiz_id
58 CONNECT BY prev = PRIOR curr AND rk = PRIOR rk
59 START WITH curr = 1) a,
60 t b
61 where a.quiz_id=b.quiz_id))
62 group by score_rs,quiz_id, range_student
63 CONNECT BY prev = PRIOR curr AND rk = PRIOR rk
64 START WITH curr = 1)
65 group by range_student,range_class) b
66 where a.range_student=b.range_student
67 and a.range_class=b.range_class
68 /
QUIZ_ID RANGE_CLASS RANGE_STUDENT SCORE_RS SAME_SET
1 2,3 2,11,12,21,22,124 375 1
2 2,3 2,11,12,21,28,124 269 1
SQL> Now, I change a record to verify if same_set work :
1* update t set student_id=28 where student_id=22 and class_id = 3 and quiz_id = 1
SQL> /
1 row updated.
SQL> select * from t;
QUIZ_ID CLASS_ID STUDENT_ID SCORE
1 2 12 34
1 2 21 134
1 2 124 0
1 3 11 21
1 3 2 99
1 3 28 87
2 2 12 7
2 2 21 13
2 2 124 42
2 3 11 21
2 3 2 99
QUIZ_ID CLASS_ID STUDENT_ID SCORE
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2 from
3 (select quiz_id,
4 LTRIM(MAX(SYS_CONNECT_BY_PATH(class_id,','))
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15 (SELECT sum(score) score_rs,quiz_id,
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18 FROM (SELECT student_id,
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20 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) AS curr,
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22 FROM (select quiz_id,class_id,student_id,score,
23 dense_rank() over (order by quiz_id) rk
24 from t))
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26 CONNECT BY prev = PRIOR curr AND rk = PRIOR rk
27 START WITH curr = 1) a,
28 t b
29 where a.quiz_id=b.quiz_id))
30 group by score_rs,quiz_id, range_student
31 CONNECT BY prev = PRIOR curr AND rk = PRIOR rk
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36 range_student,
37 LTRIM(MAX(SYS_CONNECT_BY_PATH(class_id,','))
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39 from
40 (select class_id,score_rs,quiz_id, range_student,rk,
41 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY class_id) AS curr,
42 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY class_id) -1 AS prev
43 from
44 (select distinct b.class_id, a.score_rs, a.quiz_id, a.range_student,
45 dense_rank() over (order by a.quiz_id) rk
46 from
47 (SELECT sum(score) score_rs,quiz_id,
48 LTRIM(MAX(SYS_CONNECT_BY_PATH(student_id,','))
49 KEEP (DENSE_RANK LAST ORDER BY curr),',') AS range_student
50 FROM (SELECT student_id,
51 quiz_id,rk,score,
52 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) AS curr,
53 ROW_NUMBER() OVER (PARTITION BY rk ORDER BY student_id) -1 AS prev
54 FROM (select quiz_id,class_id,student_id,score,
55 dense_rank() over (order by quiz_id) rk
56 from t))
57 GROUP BY quiz_id
58 CONNECT BY prev = PRIOR curr AND rk = PRIOR rk
59 START WITH curr = 1) a,
60 t b
61 where a.quiz_id=b.quiz_id))
62 group by score_rs,quiz_id, range_student
63 CONNECT BY prev = PRIOR curr AND rk = PRIOR rk
64 START WITH curr = 1)
65 group by range_student,range_class) b
66 where a.range_student=b.range_student
67 and a.range_class=b.range_class
68 /
QUIZ_ID RANGE_CLASS RANGE_STUDENT SCORE_RS SAME_SET
2 2,3 2,11,12,21,28,124 269 2
1 2,3 2,11,12,21,28,124 375 2
SQL> It's OK.
Nicolas.
Message was edited by:
N. Gasparotto
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COUNT the same column multiple time with 2 different condition
Hi everyone,
I have a small query but I don't find the answer. Can anyone help me with this one ? Look at this example:
WITH T AS (
SELECT 'a' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'a' as Name, 2 as v FROM DUAL
UNION ALL
SELECT 'a' as Name, 2 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 2 as v FROM DUAL
) SELECT DISTINCT name,
COUNT(DECODE(v, 1, 1, null)) OVER (PARTITION BY name ORDER BY v) as v1,
COUNT(DECODE(v, 2, 1, null)) OVER (PARTITION BY name ORDER BY v) as v2
FROM T
ORDER BY 1;This returns :
NAME V1 V2
a 1 0
a 1 2
b 2 0
b 2 1 But what I need is only one row with the count of 1 and 2 by name. How can I achieve that without using subqueries like (the following query returns the correct output)
WITH T AS (
SELECT 'a' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'a' as Name, 2 as v FROM DUAL
UNION ALL
SELECT 'a' as Name, 2 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 2 as v FROM DUAL
) SELECT DISTINCT t.name,
(SELECT COUNT(*) FROM T z WHERE z.name = t.name and z.v = 1),
(SELECT COUNT(*) FROM T z WHERE z.name = t.name and z.v = 2)
FROM T t
ORDER BY 1;The table I'm working on has millions of records and with subqueries it takes ages to executes. The one with analytical function takes less than 3 sec.
Thanks for your help!Hi,
user13117585 wrote:
Hi everyone,
I have a small query but I don't find the answer. Can anyone help me with this one ? Look at this example:
WITH T AS (
SELECT 'a' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'a' as Name, 2 as v FROM DUAL
UNION ALL
SELECT 'a' as Name, 2 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 1 as v FROM DUAL
UNION ALL
SELECT 'b' as Name, 2 as v FROM DUAL
) SELECT DISTINCT name,
COUNT(DECODE(v, 1, 1, null)) OVER (PARTITION BY name ORDER BY v) as v1,
COUNT(DECODE(v, 2, 1, null)) OVER (PARTITION BY name ORDER BY v) as v2
FROM T
ORDER BY 1;But what I need is only one row with the count of 1 and 2 by name. How can I achieve that without using subqueries Use the aggregate COUNT function instead of the analytic COUNT:
SELECT name,
COUNT(DECODE(v, 1, 1, null)) as v1,
COUNT(DECODE(v, 2, 1, null)) as v2
FROM T
GROUP BY name
ORDER BY name; -
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This does not happen all the time but often enough to be a pain. When I enter a new appointment in the calendar sometimes the phone changes the start time to what I entered as the end time. I thought maybe it was me but it happened twice today and I watched carefully to make sure I was entering it correctly. I was and it is the phone making the change. How do I fix this?
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Thanks for your help.
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