Average data

Similar Questions

• Average data from multiple text files

  I am new to labVIEW so any help is appreciated:

  I have a 100 txt files with two columns (separate tab) for a value of X and Y.

  I need the average of the values of Y to generate a single file and generate X against Y graph.

  So, how to read the data of these text files? (without having to select each one individually) and the average data and create a chart XY him?

  Thanks in advance

  There is a function to list folder in the palette of the file i/o that will return an array of file names.  Feed this table in a loop to open and read each file in turn.  Put in a new file, build a table with her, process the data or do whatever you want.

• How to get an hour on average data DAQ 6009

  I am a researcher. I ' am doing a job that requires constant tension of the DAQ 6009 map reading. Now all that his giving is very (for my work) fluctuating. So I need a medium-sized data from it during an interval of 100 ms or something. I can do through VI daq assistant or outside I do or is there a way solv EThis problem please reply.

  Hi perumpadapu.

  Yo did set sampling rate and size of block to get blocks of 100ms of data? Really?

  So why have the value "1 k"? This way you will get data every second...

  So I told you to use the average function to calc averages. You even tried it?

  

• How permanently average data of dynamic tension

  Hi all

  I LV 8.6 base.

  I gain a continuous voltage analog of the signal by a transducer of RPM using a DAQ Assistant.

  the display changes around a little and she could use some smooth. My thought is using data in groups of samples.

  The data type is dynamic from the wizard. I would try and averages 10 to 20 samples, update the display appears therefore more stable.

  I did find and watch the many examples, but I remain puzzled.

  Any thoughts?

  Mully

  "So when the Daq assistant is set to"N samples"it takes this amount of samples and returns to the average code that refreshes the screen whenever the loop runs.

  You're absolutely right.

  As for your other question, try to remove it from your sequence:

  

  This prevents your whole VI before the last image of the sequence has a chance to run. Your stop button will stop the whole loop and let the next image in the sequence to run.

• Average data acquisition alternating window 25sec

  Hello

  I am relatively new to programming and LABVIEW and was hoping to get help.

  I am analyzing the retinal potential obtained in answer to Flash (ON and OFF) model 120 LEDS (simultaneously)

  The rate at which the LED on and OFF depends on a pulse of squares of 1 Hz and 5V amp (from the device).

  I use USB-6009 to convert analog signals.

  Data are collected for 50-100 scans (LEDs go ON and OFF), is - 25-50 s of data collection. Followed by a break (no data genuine collected) from 25 to 100 seconds, after which a new cycle/game data are collected for the next dry 25-50 and so on.   Sampling rate = 1000 Hz (1ms/point).

  My goal is to perform an average of data collected with the timestamp.  Display the waveform of flood and averaged over the waveform graph and write the data on average in an Excel with a time stamp.

  Attached is a diagram of what I expect, I need a direction to start and move forward.

  Help, please

  Thank you.

  Hi Lana89,

  Since this is a simple data acquisition task, you can go through the sample data acqusiition and move forward.

  Kind regards

  SrikrishnaNF

• Average data with columns of type of data INTERVAL DAY (99) second (99)

  Hi all
  I'm trying to get an average of the run_duration column in the view of oracle JOB_RUN_DETAILS SCHEDULER(11 g R2). The data type for the run_duration column is INTERVAL DAY (3) to SECOND (0).
  How we can perform mathematical functions (sum, avg, diff) on the columns with data types (INTERVAL DAY) (3) OF SECOND (0) or TIMESTAMP WITH TIMEZONE?
  
  Thanks in advance
  VB

  user5526066 wrote:
  How we can perform mathematical functions (sum, avg, diff) on the columns with data types (INTERVAL DAY) (3) OF SECOND (0) or TIMESTAMP WITH TIMEZONE?

  For some reason any Oracle allow to add/subtract intervals but does not aggregate the. If you don't care about fractions of a second:

  select  owner,
          job_name,
          numtodsinterval(avg((sysdate + run_duration) - sysdate),'day') average_run_duration
    from dba_scheduler_job_run_details
    group by owner,
             job_name
  /
  
  OWNER                          JOB_NAME                                                          AVERAGE_RUN_DURATION
  ------------------------------ ----------------------------------------------------------------- -------------------------------
  EXFSYS                         RLM$SCHDNEGACTION                                                 +000000000 00:00:00.015873015
  ORACLE_OCM                     MGMT_STATS_CONFIG_JOB_1                                           +000000000 00:00:00.000000000
  SYS                            PURGE_LOG                                                         +000000000 00:00:00.290322580
  ORACLE_OCM                     MGMT_CONFIG_JOB                                                   +000000000 00:00:00.479999999
  ORACLE_OCM                     MGMT_CONFIG_JOB_1                                                 +000000000 00:00:01.439999999
  SYS                            AUTO_SPACE_ADVISOR_JOB                                            +000000000 00:00:19.680000000
  EXFSYS                         RLM$EVTCLEANUP                                                    +000000000 00:00:00.000000000
  ORACLE_OCM                     MGMT_STATS_CONFIG_JOB                                             +000000000 00:00:01.000000000
  SYS                            GATHER_STATS_JOB                                                  +000000000 00:01:52.400000000
  
  9 rows selected.
  
  SQL> 
  

  SY.

• Average dates in a column.

  Hello Oracle gurus,
  
  I'm having a problem. I have a table with 2 columns. One is the food arrival time and one is the name of the stream. I want to know the arrival time average power to all feedingstuffs.
  
  To explain better, assume that there are 2 1 power supply 2 power wires, pass the 3 that I receive every day and I have a table with corresponding time_stamp during which the flow came. I want to know the average length of the day which each stream is reached during a month.
  
  Is there a possible way to do it?
  
  Thank you
  ABS

  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
  SELECT TO_CHAR(TO_DATE('2/6/2009 3:53:00 AM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1FG1'                 FROM DUAL UNION ALL
  SELECT TO_CHAR(TO_DATE('2/7/2009 3:58:00 AM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1FG1'              FROM DUAL UNION ALL
  SELECT TO_CHAR(TO_DATE('2/2/2009 7:39:00 PM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1TR1'              FROM DUAL UNION ALL
  SELECT TO_CHAR(TO_DATE('2/3/2009 7:39:00 PM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1TR1'              FROM DUAL UNION ALL
  SELECT TO_CHAR(TO_DATE('2/4/2009 7:41:00 PM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1TR1'              FROM DUAL UNION ALL
  SELECT TO_CHAR(TO_DATE('2/5/2009 7:43:00 PM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1TR1'              FROM DUAL UNION ALL
  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
  SELECT TO_CHAR(TO_DATE('2/9/2009 7:42:00 PM' ,'MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1TR1'              FROM DUAL UNION ALL
  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
  SELECT TO_CHAR(TO_DATE('2/3/2009 10:58:00 PM','MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                        , '1DE1'              FROM DUAL UNION ALL
  SELECT TO_CHAR(TO_DATE('2/4/2009 10:45:00 PM','MM/DD/YYYY HH:MI:SS AM'),'SSSSS')                                    , '1DE1'              FROM DUAL UNION ALL
  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
  )
  select TO_CHAR(TO_DATE(AVG (DISTINCT FEED_ARRIVAL),'SSSSS'),'HH24:MI:SS'), FEED_CODE
  from t
  GROUP BY FEED_CODE
  order by FEED_CODE
  ;
  
  TO_CHAR( FEED
  -------- ----
  22:41:20 1DE1
  03:47:24 1FG1
  19:41:15 1TR1
  
  3 rows selected.
  

• VI data on average compared to the data from the Excel file on average .lvm

  I am trying to build a .VI to measure voltages on a channel of a transducer of pressure for a period of 3 minutes.  I would like the .VI to write all the samples of blood to a file .lvm with another .lvm file that comes from the average voltage over the period of 3 minutes.  I built a .VI making everything above so I think that... The problem I'm running into is when I opened the file .lvm of all samples of blood in MS Excel and take the average of them using the built-in Excel function (= AVERAGE(B23:B5022) for example) averaged and compare it to the .lvm file, which has just 3 minute average .VI voltage, they do not correspond to the top.

  This makes me wonder if I use VI with an average of function correctly or if maybe VI averages data different voltage than what is written in the .lvm file.

  Does anyone know why the two averages are different and how I can match.

  I have attached a picture of my functional schema with the file .VI for clarity.

  The Type of dynamic data of LabVIEW you use is a special data type that can take many forms.  It therefore requires the use "Of DDT" and "DDT" for the conbert to and from other data types.  These special conversion functions can be configured by double-clicking them and specifying the format you are converting from.  You can find the functions on the pallet handling Express-Signal.

  I've attached a screenshot of the modification of the code using the "DDT" and the average is very good.

  Please mark this as accepted such solution and/or give Kudos if it works for you.  We appreciate the sides for our answers.

  Thank you

  Dan

• DASYLab how to write data to a file every 15 minutes

  Hi all

  I use dasylab and datashuttle/3000 to record data. What I want to do is to write data to a file every 15 minutes. I use the milti-file, which can write data to the file diffenret, but how do I control the timing, as the journal data every 15 minutes automatically.

  The other problem is that I use FFT analysis of the frequency spectrum. How can I determine the value of frequency where the peaks that happens.

  Thank you

  Write less data in the file that you have collected requires the reduction of certain data.

  There are three techniques to consider.

  With an average or an average of block - both reduce the data by using a function of averaging, defined in the module. To accomplish the reduction of data, choose block or RHM mode in the dialog box properties, and then enter the number of samples/data values that you want to reach on average.

  Average - when you reduce the data, you also should reblock data using the block length of the change in the output parameter. For example if you enjoy at 100 samples/second with a block size of 64, the average module configured on average, more than 10 samples will take 10 times longer to fill a block. The initial block represent 0.64 seconds, the output block represent 6.4 seconds at a sampling rate of 10 samples/second. If you change the size of output in one block, the program remains sensitive.

  Average block - average values in a block against each subsequent block, where the average is based position. The first samples are averaged, all second samples are average... etc. The output is a block of data, where each position has been averaged over the previous blocks. This is how you will be an average data FFT or histogram, for example, because the x-axis has been transformed in Hz or bins.

  Second technique - separate module. This allows to reduce the data and the effective sampling rate jumping blocks or samples. For example, to reduce the data in 1000 samples / second to 100 samples per second, configure the module to keep a sample, jumping 9, keep one, jumping 9, etc. If you configure to skip blocks, you will not reduce the sampling frequency, but will reduce the overall amount of data in a single block 9, for example. It is appropriate for the FFT data or histogram, for example, to have the context of the correct data.

  Finally, you can use a relay and a synchronization module module to control. For example, to reduce a sample data every 15 seconds, configure a generator module of TTL pulses for a cycle of 15 seconds of time. Connect it to a Combi trigger module and configure it to trigger on rising and stop the outbreak directly, with a trigger value after 1. The trigger output connects to the X of the relay command input.

  In addition to these techniques, you can change the third technique to allow a variable duration using a combination of other modules.

  Many of these techniques are covered in the help-tutorial-Quickstart, as the data reduction is one of the most frequently asked questions.

  In regards to the FFT... use the module of statistical values in order to obtain the Maximum and the Max Position. The Position of Max will be the value of the frequency associated with the Maximum value. The output of the statistics module is a single sample per block. Look at the different FFT sample installed in the worksheet calculation/examples folder.

• How to save the data of different rates in a single VI?

  Hello

  I tried to acquire 2-channel measurement of voltage at 10 kHz and analyze data, finally to save the data to both 1 kHz and 1 Hz. What I did is this loop of producer/consumer use to do the work of recording at different rates. I have queued all the data in the main loop, and then removed the data and write it to the file in other loops. I added "wait = 1 ms' a consumer loop for recording data at 1 kHz (loop of fast logging) and added" wait = 1000ms' in another loop to get the slow 1 Hz (logging loop) data record.

  My problem is that the data record works fine in the case of 1 Hz, but it does not work for the case of 1 kHz. Although the time-out period defined as 1ms, the interval between two samples in the loop of fast data recording is about 100ms.  Subsequently, 1ms, 10ms, 100ms, 150ms tried in this loop to see what intervals are in these cases. I found that the intervals are same as assigned in the timeout greater than 100 ms, but if the time-out is set to 1ms or 10ms, the intervals are again around 100ms.

  My question is - why I can't reach data record 1 kHz using loop of consumers/producers, while the same way works for the case of 1 Hz?

  Thank you very much

  Hao

  You are sampling at 10 kHz and you want to back up your data "as if you sampled at 1 kHz and 1 Hz", if I understand correctly.  I also understand that you use the design of producer/consumer model to help with this (a good idea).

  I'm assuming that the producer 'product' a segment of data at a time, to say the value of a second of data or a 2 x 10000 I16 (assuming a 16-bit integer A/D) table you put into a queue and wait for the consumer.

  If you have data at 10 kHz, how do you get representations to 1 kHz or 1 Hz?  There are (at least) two possibilities - average data over the interval of proper time, or (re) sample data.  The good thing is that you can handle the situation 1 kHz and 1 Hz, essentially at the same time and in the same processing loop.  I'll discuss the case 1 kHz - with the assumptions I made, the case of 1 Hz becomes almost trivial.  I'll discuss treatment also just one channel, as it is similarly almost trivial to go from 1 to N-channel.

  If you have 1 second of data sampled at 10 kHz, and will "reduce" 1 second of data sampled at 1 kHz.  Note that you have 10 samples for each data point that you want in the end.  The "Averaging" method said "Replace all 10 points in the average of these 10 points", while "resampling" method said "replace 10 points with, say, the first point, ignoring the others.  An easy way to do this is to use the Reshape feature to transform an array of 10 x 1000 elements of your array of 10000 items 1-D 2D.  Now, you can use a loop FOR an average of 10 items or simply extract the first.  [This is where almost everyone, including me, a mistake - when you put a 10 x 1000 2D array in a loop, you get 10 iterations of 1000 items and we want 1000 iterations of 10 items.]  Oops, what to do?  [Simple - converts 2D array before sending in the loop FOR.]

  So when you have processed your 10,000 points and got both 1000 samples "1 kHz" and 1 "1 Hz" sample, you write each of them in their respective folder and wait for the next item in the queue of the consumer.  Consumer focus on the queue loop, it will automatically 'block', waiting for the producer of the 'feed' some data.  Note that the producer generates data once per second, producing 10000 points for the consumer in the process, but the time to deal with these points and perform the required disk i/o should take only a few milliseconds (certainly not more than 100, even if writing to a floppy!), so you don't have much time to do other interesting things (such as display data).

  Bob Schor

• write data in table 2D

  Hello, I am writing my data flowing in table 2D. I have attached a sample vi. What is the problem is that:

  As the block diagram shows, there is a 2D array whose first column has given fixed. Here's the 1,0.977,0.955..etc. These are my constant values X. The problem is on the writing of values Y in the second column.

  First of all, I run the program, it runs and I stop, so we calculate an average value because of the "magnitude and level Measurements.vi. So I want to write this value average to 2. line in 2.column. Then I push the pause button twice and the program continues again and stops. So I want the program to write average data of this stage in line 3. 2 column and so on. I want also to the value of 1 line. 2. constant zero column. However, after each loop is executed, the average value is always crushed by 1. row of 2. column. The other rows of 2. column are always zero. So, I want to like this;

  1             0

  value of the first run of average 0,977

  the value of the second run average 0,955

  average value of the third execution of 0,917

  0.88.. .and so on.

  0.842                          .

  0.767                          .

  0.692                          .

  0.617                          .

  0.504                          .

  0.391                          .

  0.278                          .

  0.165                          .

  0                                .

  After obtaining table 2D it liked, I will trace the XY graph and then curve fitting. My original vi cannot be fully open so I have attached a sample vi. Could you please help me as soon as possible?

  
  

• Data streaming

  Hi, I'm trying to use labview to work with data in a very specific way.  I use a USB-6009 case import a continuous analogue signal in labview.  Then, I want to take this signal and jailbroken it down to perform calculations on.  Basically break it in a second segment 5, average of all the data, store the average, then repeat for 5-10 seconds, 10-15 and so on, to store all these averages (everything always seizes in the continuous signal).  I tried initially using the moving average smoothing function, but that was more than a moving average then taking the blocks.  I'm just starting to learn to labview, and I know that my data are acquired in a while loop and I am fairly certain that I'll have to write another loop within this segment and average data. I'm just wrong to put it all together.

  Any help is very appreciated.

  Kim,

  The simple and direct way is to register offset on the while loop with playback. Use analog playback with output rather than waveform output array.  Add the new data table to the old array of data and it lead the shift register.  This works but requires LV to frequently re - allocate memory for the table space.  The licensing process can cause programs slow down or even crash because the table becomes very large.

  A better way is to use the array to initialize to allocate space for diversity, you will use, and then use subset of table to replace inside the loop to put the data in the table.  The image below illustrates two methods. I used a model sinuses rather than the DAQmx Read VI because I do not have available DAQmx.

  

  Lynn

• How to save two sous-schema data two in one file?

  Hello

  I have a VI tensions from different measurement channels one after the other. How could save the average data two in one file in two columns? The vi is attached. Thank you!

  Watch the context-sensitive help and help for function file writing worksheet to know each connector for then detailed.  You have several things hanging and some things wrong.

  The entrance to the lower part is a Boolean value to append data.  You want it as a True constant since you want to write constantly new data in the file to each iteration of the loop.

  You can't 1 d and 2D connectors at the same time hung.  It is there to give you options.  If the 1 d link has it who uses data, otherwise it uses the connector 2-D data.

  What you want to do is to take the 3 pieces of data and integrate it to a 1 d table and that wire in the 1-D connector.  Connector 2-D leave blank.

• Saving data with automatic time intervals

  Hello world

  I am a new user with LabVIEW (I just started using it 3 weeks ago) and I'm having a problem with the registration data and recording.

  Basically, we want to do is monitor data for four different variables countinuosly but to record in intervals of time specified and automatic. Specifically, we would like to save countinuosly of data only for five minutes every hour. After 5 minutes, only the backup function must be stopped for 1 hour, then return to save 5 minutes without closing the major loop. In addition, we would like to collect all the data in this way in one exel file per day for three weeks or more, so rather than create a data file for each record, we stand at their gathering in one file per day.

  Finally, if possible, we would like to extract the average data for a day in a single file.  We are not interested in changing the rate of data acquisition, we only focus on the savings rate. We tried several timed function (as the elapsed time, delay time, wait) and loops timed, but it was impossible to synchronize different loops or implement synchronization for the issuance of savings without blocking the work of the main loop.

  The data are collected via the function "write to file action.

  any kind of help will be really appreciated!

  Here, we submit our front panel block diagram of our VI.

  Best regards

  Use a shift register to keep track of your departure time.  If the difference between the start time and the current time less than 5 minutes, save the data.  If the time difference is one hour, save the new time as the start time.

• Spreadsheet string table / why data medium becomes zero

  Hello

  I converted an array of 3 x 2 to 2 x 3 table with table 2D to transpose, then I used "table to a spreadsheet string" vi to convert my table from 2 x 3 to a string. The string format is %f. The table consists of numbers and the text as:

  frequency capacitance resistance
  100                  10                     100

  When I try to write data to the file text the number in the Middle becomes 0. I used probes for debugging. I discovered that the problem is in the output of the 'picture to a worksheet string' vi.  The input data (which are a 2D table) are ok, but out (which is a string), the average data are zero! I can not find the reason.

  Thanks in advance for your help

  The problem lies in the scale of your value.  Primary parameter is 14.5, which rounds to zero because it is rounded to 6 decimal places and pico is too small.  Use %g instead of %f for your format code.

  I do not understand why you generate values at the ends of the empty table.  A lot of this manipulation of cluster and table seems unnecessary.

  I removed the while loop and the agilent Subvi is so I could run this.  But basically your code can be disassembled for this.

  

  PS: because you have attached the code, we could zoom in and see that the problem was with the size of your data, that we couldn't see on the initial partial screenshot of the code.