Average cycles of data

Hi, there,
My problem is as follows:
I have a PCI DAQ card. I need to read two set of sychornized values. One set is a periodic waveform data (wave 1, say triangular waveform) the other set (wave2) is actually the signal in response to the triangular waveform from my hardware.
Since the data is periodic, I want to average the data captured in different cycles so that the noise will be greatly reduced.
The user can specify how many cycles of the waveform are required in the user-interface.
My question is
In order to average the cycle I need to find a way to differentiate individual cycle 1st. So in this case of a triangular wave, may I know what is the best way to extract each individual waveform cycle (wave1)and the corresponding data points in wave2?
Rgds,
Jacob

Jacob,
Thank you for posting to the NI forums. There are several ways you could approach this problem. One pretty straightforward way would be to use software techniques to split up the waveform into periods. For example you could use the Extract Single Tone Information.vi to determine the period of each cycle. Then using this period information you could use the Get Waveform Subset.vi to extract single cycles from the waveform. Let me know if you have any questions about using this approach.
Regards,
Neil S.
Applications Engineer
National Instruments

Similar Messages

Calculate average for some dates

Hi,
I would like to calculate average for some dates. Is there any function module or any process, please provide me.
venkat.

Use this FM HR_HK_DIFF_BT_2_DATES
Example:
DATA: DATE1 type P0001-BEGDA,
DATE2 type P0001-BEGDA,
YEARS type P0347-SCRYY,
MONTHS type P0347-SCRMM,
DAYS type P0347-SCRDD.
DATE1 = '20070331'.
DATE2= '20070101'.
CALL FUNCTION 'HR_HK_DIFF_BT_2_DATES'
EXPORTING
DATE1 = date1
DATE2 = date2
OUTPUT_FORMAT = '03'
IMPORTING
YEARS = years
MONTHS = months
DAYS = days
EXCEPTIONS
INVALID_DATES_SPECIFIED = 1
OTHERS = 2
IF SY-SUBRC 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Regards,
Joan

SUM(Case how to use this structure to get average values over date range

I am using:
Oracle SQL Developer (3.0.04) Build MAin-04.34 Oracle Database 11g Enterprise Edition 11.2.0.1.0 - 64bit Production
How do I use the sum function with a case structure inside.
so I have data that looks like has an ID, date, and value. I am looking to get the 7 day average for the date range of 4/1/2013 thru 4/20/2013
with t as (
select 1 ID_Key,to_date('4/1/2013','mm-dd-yyyy') date_val, 10 Value_num from dual union all
select 1 ID_key,to_date('4/2/2013','mm-dd-yyyy'), 15 from dual union all
select 1 ID_key,to_date('4/3/2013','mm-dd-yyyy'), 20 from dual union all
select 1 ID_key,to_date('4/5/2013','mm-dd-yyyy'), 0 from dual union all
select 1 ID_key,to_date('4/8/2013','mm-dd-yyyy'), 12 from dual union all
select 1 ID_key,to_date('4/9/2013','mm-dd-yyyy'), 8 from dual union all
select 1 ID_key,to_date('4/10/2013','mm-dd-yyyy'), 6 from dual union all
select 1 ID_key,to_date('4/12/2013','mm-dd-yyyy'), 10 from dual union all
select 1 ID_key,to_date('4/13/2013','mm-dd-yyyy'), 0 from dual union all
select 1 ID_key,to_date('4/14/2013','mm-dd-yyyy'), 0 from dual union all
select 1 ID_key,to_date('4/15/2013','mm-dd-yyyy'), 10 from dual union all
select 1 ID_key,to_date('4/16/2013','mm-dd-yyyy'), 5 from dual union all
select 1 ID_key,to_date('4/17/2013','mm-dd-yyyy'), 2 from dual union all
select 1 ID_key,to_date('4/20/2013','mm-dd-yyyy'), 3 from dual union all
select 2 ID_key,to_date('4/3/2013','mm-dd-yyyy'), 12 from dual union all
select 2 ID_key,to_date('4/5/2013','mm-dd-yyyy'), 15 from dual union all
select 2 ID_key,to_date('4/6/2013','mm-dd-yyyy'), 5 from dual union all
select 2 ID_key,to_date('4/7/2013','mm-dd-yyyy'), 7 from dual union all
select 2 ID_key,to_date('4/9/2013','mm-dd-yyyy'), 10 from dual union all
select 2 ID_key,to_date('4/11/2013','mm-dd-yyyy'), 5 from dual union all
select 2 ID_key,to_date('4/12/2013','mm-dd-yyyy'), 0 from dual union all
select 2 ID_key,to_date('4/13/2013','mm-dd-yyyy'), 0 from dual union all
select 2 ID_key,to_date('4/15/2013','mm-dd-yyyy'), 6 from dual union all
select 2 ID_key,to_date('4/16/2013','mm-dd-yyyy'), 8 from dual union all
select 2 ID_key,to_date('4/17/2013','mm-dd-yyyy'), 0 from dual union all
select 2 ID_key,to_date('4/18/2013','mm-dd-yyyy'), 10 from dual union all
select 2 ID_key,to_date('4/19/2013','mm-dd-yyyy'), 5 from dual
)**Please let me know if the table does not load.
I would like to get the 7 day average as long as there is date for that row has enough previous dates, it not then it will return null.
the results should look like this
ID_Key      date_val     Value_num     7Day_Avg     7Day_Avg2
1     4/1/2013     10          null          null
1     4/2/2013     15          null          null
1     4/3/2013     20          null          null
1     4/5/2013     0          null          null
1     4/8/2013     12          6.71          11.75
1     4/9/2013     8          5.71          10.00
1     4/10/2013     6          3.71          6.50
1     4/12/2013     10          5.14          9.00
1     4/13/2013     0          5.14          7.20
1     4/14/2013     0          5.14          6.00
1     4/15/2013     10          4.86          5.67
1     4/16/2013     5          4.42          5.17
1     4/17/2013     2          3.85          4.50
1     4/20/2013     3          2.86          4.00
2     4/3/2013     12          null          null
2     4/5/2013     15          null          null
2     4/6/2013     5          null          null
2     4/7/2013     7          5.57          9.75
2     4/9/2013     10          7.00          9.80
2     4/11/2013     5          6.00          8.40
2     4/12/2013     0          3.86          5.40
2     4/13/2013     0          3.14          4.40
2     4/15/2013     6          3.00          4.20
2     4/16/2013     8          2.71          3.80
2     4/17/2013     0          2.71          3.17
2     4/18/2013     10          3.43          4.00
2     4/19/2013     5          4.14          4.83As you may notice, there are gaps in the dates, so the value are then treated as zeros for the 7Day_Avg and then ignored for teh 7Day_Avg2 (not counted as number of days averaged do to no valu_num row)
I was trying something like this to start, but getting error "missing keyword"
select
t.*/,
sum(
      case
        when date_val between :day2 - 6 and :day2
        then value_num between date_val - 6 and date_val
        else null
        end
        as 7Day_avg
form tShould I have the case structure outside the sum function?
Any thoughts??
Edited by: 1004407 on Jun 7, 2013 11:06 AM

Hi,
If you want the average of the last 7 days, including the current day, then then RANGE should be 6 PRECEDING, not 7.
Try this:
WITH     got_min_date_val AS
        SELECT id_key, date_val, value_num
        ,       MIN (date_val) OVER () AS min_date_val
        FROM    t
        WHERE date_val BETWEEN TO_DATE ('04-01-2013', 'mm-dd-yyyy')
                         AND   TO_DATE ('04-20-2013', 'mm-dd-yyyy')
SELECT    id_key, date_val, value_num
,         CASE
              WHEN date_val >= min_date_val + 6
              THEN SUM (value_num) OVER ( PARTITION BY id_key
                                           ORDER BY      date_val
                                           RANGE         6 PRECEDING
                    / 7
          END AS avg_7_day
,         CASE
              WHEN date_val >= min_date_val + 6
              THEN AVG (value_num) OVER ( PARTITION BY id_key
                                           ORDER BY      date_val
                                           RANGE         6 PRECEDING
          END   AS avg_7_day_2
FROM      got_min_date_val
ORDER BY id_key
,         date_val
Output:
   ID_KEY DATE_VAL   VALUE_NUM AVG_7_DAY AVG_7_DAY_2
         1 01-APR-13         10
         1 02-APR-13         15
         1 03-APR-13         20
         1 05-APR-13          0
         1 08-APR-13         12       6.71        11.75
         1 09-APR-13          8       5.71        10.00
         1 10-APR-13          6       3.71         6.50
         1 12-APR-13         10       5.14         9.00
         1 13-APR-13          0       5.14         7.20
         1 14-APR-13          0       5.14         6.00
         1 15-APR-13         10       4.86         5.67
         1 16-APR-13          5       4.43         5.17
         1 17-APR-13          2       3.86         4.50
         1 20-APR-13          3       2.86         4.00
         2 03-APR-13         12
         2 05-APR-13         15
         2 06-APR-13          5
         2 07-APR-13          7       5.57         9.75
         2 09-APR-13         10       7.00         9.80
         2 11-APR-13          5       6.00         8.40
         2 12-APR-13          0       3.86         5.40
         2 13-APR-13          0       3.14         4.40
         2 15-APR-13          6       3.00         4.20
         2 16-APR-13          8       2.71         3.80
         2 17-APR-13          0       2.71         3.17
         2 18-APR-13         10       3.43         4.00
         2 19-APR-13          5       4.14         4.83
Message was edited by: FrankKulash
Sorry; I meant to reply to OP, not to Greg

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Just bought a used 2011 "13 for a super deal and the battery cycles say 495. Does this sound a bit high? Health is 89%. I haven't done a recalibration after doing a fresh install and pram and SMC reset. What are yours saying after a year of use?

Yea seems like it from my research on average cycles. Nothing bad though it is showing 6:30 hours after a 100% charge and lasts about that long. I got it for $700 and it is in perfect cosmetic and mechanical condition. So even with battery replacement factored in its not that much. How long does yours last after a years worth of use with light duty use?

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I've had my computer 15" Powerbook for about 22 months. Cycle count =367. My AppleCare warranty ends in about 14 more months. What's the average cycle count before the battery dies?
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First, you should know that Applecare doesn't cover the battery, it is specifically excluded unless it's defective. That's because Apple considers the battery a consumable item. You can read it under limitations at http://images.apple.com/legal/applecare/docs/AppleCareProtect_Plan_NAen.pdf
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I am very new to the world of LabView and I am looking for some help. I am trying to write a code that I can use in the testing of heat pump water heaters. I have gotten my code to a point where I can read in my temperature and flow rates, and calculate the BTU/hr for my heat pumps, but I want to be able to average my BTU/hr so my data isn't as noise. I would really like to be able to have my code take in say 200 samples of data and create a live average that I can display on a graph. I have tried many different kinds of mean.vi's using different loops and arrays, but I haven't come up with anything that works right. Most likely I am an idiot and doing this all wrong anyways, but some help would be greatly. Please see my attached code.
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Test Stand for Forum.vi ‏197 KB

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Simple Test Code 1.vi ‏22 KB
Simple Code 1.JPG ‏22 KB

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Edited by: user817525 on Jul 21, 2009 11:15 PM

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http://www.paulharris.engineering

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Hello Oracle Gurus,
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I think my query works in this case..
with t
as
SELECT TO_CHAR(TO_DATE('2/3/2009 3:12:00 AM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')     FEED_ARRIVAL , '1FG1'     FEED_CODE   FROM DUAL UNION ALL
SELECT TO_CHAR(TO_DATE('2/4/2009 3:47:00 AM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1FG1'              FROM DUAL UNION ALL
SELECT TO_CHAR(TO_DATE('2/5/2009 4:07:00 AM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1FG1'                 FROM DUAL UNION ALL
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SELECT TO_CHAR(TO_DATE('2/6/2009 7:43:00 PM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1TR1'              FROM DUAL UNION ALL
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SELECT TO_CHAR(TO_DATE('2/2/2009 10:20:00 PM','MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1DE1'              FROM DUAL UNION ALL
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SELECT TO_CHAR(TO_DATE('2/5/2009 10:46:00 PM','MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1DE1'              FROM DUAL UNION ALL
SELECT TO_CHAR(TO_DATE('2/6/2009 10:37:00 PM','MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1DE1'              FROM DUAL UNION ALL
SELECT TO_CHAR(TO_DATE('2/9/2009 10:42:00 PM','MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1DE1'              FROM DUAL
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from t
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order by FEED_CODE
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Tuning average of a data set calculation in an increasing Data Set

I was asked a question by one of my colleagues in another team:
In a table with increasing number of rows and that too in an increasing order of Id Keys- 1,2, ....3000... 12000 .... 50000..............
We have a column age.
And we have a query:
select avg(age) from <tablename> ;
This query is increasingly taking a longer time
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I guessed that we might need some sort of partitioning or additional grouping but I am not fully sure
as to that would be the best solution.
What do you say?

I was asked a question by one of my colleagues in another team:
In a table with increasing number of rows and that too in an increasing order of Id Keys- 1,2, ....3000... 12000 .... 50000..............
We have a column age.
And we have a query:
select avg(age) from <tablename> ;
This query is increasingly taking a longer time
How to optimize it.
I guessed that we might need some sort of partitioning or additional grouping but I am not fully sure
as to that would be the best solution.
What do you say?
I say it sounds like an interview question to me!
A question like that is often ask to see how (or if) a person thinks before answering.
Will they just blindly try to privide an answer?
Are they willing to ask questions to clarify the question being ask?
Will they ask questions to try to understand the actual requirements?
1. No one stores AGE in a database. Someone's age changes everyday so 'age' is a total meaningles piece of data. A data element like 'age at death' is meaninful and does NOT change. It can be meaningful because it protects potentially sensitive information like birth date and death date.
2. Neither the questioner nor you have presented ANY INFO indicating that any query needs to be optimized. Of course a query on an increasing amount of data will take an 'increasingly' longer amount of time. That should be obvious. If someone asks you to count to 100 won't that take MORE TIME than counting to 95?
3. A simple query like 'SELECT AVG(age)' does NOT need to be optimized - certainly not based on any info you provided. That AVG function may be part of a larger, more compliex, query and maybe that 'other' query needs to be tuned.
Your 'colleague' is either 'testing' you or 'playing' with you.
If it ain't broke, don't fix it.
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