transpose a simple loop

Similar Questions

• Leak memory in a simple loop to save data in the table?

  Hello world

  I'm trying to set up a simple code to read a certain amount of data in a table at a fixed sampling rate and put these data in a local variable.  I'll put this on one OR cRIO-9073 using the scanning engine and the data comes from one NOR 9208 with a speed of approximately 250 Hz scanning, even if it is not really important at the moment.

  I made this little test VI which I suspect contains a memory leak, but I'm not able to identify it.  The reason for my suspicion is that when I run the vi on a VMWare virtual machine (LabVIEW 2010 on Windows XP) it claims soon that it is short-term memory.  Of course, the problem is perhaps elsewhere, but I hope that someone more experienced with LabVIEW programming will be able to find all the bugs very easily because it is really a piece very simpel to code. :-)

  I have included a copy of the VI with a screenshot to illustrate.

  Regards, Martin

  PS my code looks a bit awkward, so if anyone has a better solution, I'd be very happy to learn about it!

  Hello Martin,

  I would try a different approach to your problem. Currently you reshape your table each iteration of the loop. This means that the allocator memory of LV must find a new piece of contiguous memory each iteration of the loop. You're probably fragment your memory and so short of contiguous blocks of memory, leading to the release of messages from memory.

  For these types of tasks, I recommend having an array of fixed size that you initialize outside the loop and then use the Replace table subset in the loop for updating the values. This avoids the problem of allocating memory you use in.

  Alternatively, since I assume that you use the local variable to pass data to another loop, you can use a FIFO RT to manage data. A RT FIFO resembles a queue of LV, but it is designed so that you can keep determinism in your application. Set up an acquisition loop that exports data from the 9208 every 4ms in a RT FIFO. Then set up your processing loop to run at a slower pace - say every 200ms. The processing loop reads all the elements of the FIFO until it is empty every 200ms or a number of samples. The RT FIFO is fixed size, if you need to make it large enough to contain at least 200/4 = 50 samples. For more security, you should do several times bigger, maybe 200 samples. You can try different sizes of the FIFO and also to the different periods of your processing loop to your application's specifications.

  Using this method you do not have to create a counter to track items, since the reading of FIFO function can tell you how many items is in the FIFO and also when it is empty.

  I recommend you the example of Communication of FIFO of RT which comes with LabVIEW to get an idea of how to use these functions.

  Gerardo

• Simple loop does not

  I'm trying this simple FOR loop statement, but it keeps giving me the following error. Any help is greatly appreciated! Thank you very much.

  Error report:

  ORA-06550: line 5, column 18:

  PLS-00382: expression is of the wrong type

  06550 00000 - "line %s, column % s:\n%s".

  * Cause: Usually a PL/SQL compilation error.

  * Action:

  / * QUERY * /.

  -Creating a temporary table

  CREATE TABLE zzTab)

  NUMBER of num

  );

  -Insertion of values from 1 to 10 in the table

  BEGIN

  I'm IN

  (

  SELECT to_number (ROWNUM) I

  OF the double

  CONNECT BY ROWNUM < = 10

  )

  LOOP

  INSERT INTO zztab)

  NUM

  )

  7. SELECT * I num

  Double;

  END LOOP;

  END;

  Hello

  It will be easier to understand if you use different names for the record that contains the line (I kept it as I have below) and column (I changed it since I was at r_num below).
  Use it instead:

  BEGIN

  I'm IN

  (

  SELECT to_number (ROWNUM) AS r_num

  OF the double

  CONNECT BY ROWNUM<>

  )

  LOOP

  INSERT INTO zztab)

  NUM

  )

  7. SELECT * i.r_num AS num

  Double;

  END LOOP;

  END;

  When you reference a column in the record, you give you both the registration name and the column name, for example i.r_num

  Furthermore, you need not PL/SQL for this.  SQL is simpler and more effective:

  INSERT INTO zztab (num)

  7. SELECT * ROWNUM

  OF the double

  CONNECT BY ROWNUM<=>

  ;

• Help simple loop for no data found

  I am new to PL/SQL and will have problems trying to manage people entering in a good REC BANNER_ID. In the beginning of the game
  

    for rec in c1 loop
        select SPRIDEN_pidm into pidm 
          from SPRIDEN
         where SPRIDEN_ID = rec.BANNER_ID and SPRIDEN_CHANGE_IND is null; 

  I get no data found when an identification number is entered that does not exist in the spriden table. I want to be able to have the people who did not go in a good REC BANNER_ID in skipped records County which is towards the end. I tried a lot of things, but I do not seem to get anywhere. I'm sure it's pretty simple. I think I need to add some kind of "* IF."
  statement to the article mentioned above. Here is the whole part of the code
  

  --set serveroutput on format wraped;
  set serveroutput on;
  set verify off;
  spool /u03/banjobs/LOCAL/student/scholar_insert.txt
  Declare
     term_code  varchar2(6) := '&&TERM';
     cursor c1 is select * from ttubantemp.SXTSCHOLAR;
     Pidm  Number;
     so   varchar2(2);
     icnt  number := 0;
     cnt   number := 0;
     insert_cnt number := 0;
     update_cnt number := 0;
     exist_cnt  number := 0;
     skip_cnt   number := 0;
  BEGIN
     dbms_output.enable (buffer_size => null);
     for rec in c1 loop
        select SPRIDEN_pidm into pidm 
          from SPRIDEN
         where SPRIDEN_ID = rec.BANNER_ID and SPRIDEN_CHANGE_IND is null;
         Select Count(*) Into Cnt
           From SPRCMNT
           Where Sprcmnt_Pidm = Pidm
           And Sprcmnt_Cmtt_Code = 'SO';
   --        and SPRCMNT_TEXT not like term_code;
        If Cnt > 0 Then
           Select Sprcmnt_Cmtt_Code Into So
             From Sprcmnt
            Where Sprcmnt_Pidm = Pidm
            and  SPRCMNT_CMTT_CODE = 'SO';
        Else
           so := null;
        end if;
  --
        dbms_output.put_line('BANNER_ID = '||rec.BANNER_ID||
                             ' - PIDM = '||Pidm||
                             ' - Term = '||Term_Code||
                             ' - cnt = '||Cnt);
                        
          If Pidm Is Not Null
          then
           Select Count(*) Into Cnt 
             From Spriden
            Where Spriden_Pidm = Pidm
            And So Is Null;
           if cnt > 0 then
              dbms_output.put_line('   INSERTING');
             INSERT INTO sprcmnt(
                SPRCMNT_PIDM,
                SPRCMNT_CMTT_CODE,
                SPRCMNT_TEXT,
                SPRCMNT_TEXT_NAR,
                SPRCMNT_CONFIDENTIAL_IND,
                SPRCMNT_DATE,
                SPRCMNT_ORIG_CODE,
                SPRCMNT_ACTIVITY_DATE,
                SPRCMNT_CTYP_CODE,
                SPRCMNT_CONTACT_DATE,
                SPRCMNT_USER_ID,
                SPRCMNT_CONTACT_FROM_TIME,
                SPRCMNT_CONTACT_TO_TIME)
         VALUES (pidm,
                'SO',
                term_code,
                NULL,
                'N',
                Sysdate,
                'SCHL',
                SYSDATE,
                NULL,
                Null,
                'NEXTGEN',
                NULL,
                NULL);
              insert_cnt := insert_cnt + 1;
           else
            select count(*) into cnt 
             from sprcmnt
            Where Sprcmnt_Pidm = Pidm
             And So Is Not Null
             And Sprcmnt_Text Like '&&%TERM%';
              if cnt > 0 then
                 dbms_output.put_line('   UPDATING');
                 update sprcmnt
                    set SPRCMNT_TEXT = SPRCMNT_TEXT||' '||term_code
                  where SPRCMNT_PIDM = pidm
                    and  SPRCMNT_CMTT_CODE = 'SO';
                  update sprcmnt
                    set SPRCMNT_ACTIVITY_DATE = sysdate
                  where SPRCMNT_PIDM = pidm
                    and  SPRCMNT_CMTT_CODE = 'SO';
                   Update Sprcmnt
                    set SPRCMNT_USER_ID = 'NEXTGEN'
                  where SPRCMNT_PIDM = pidm
                    and SPRCMNT_CMTT_CODE = 'SO';
                  update_cnt := update_cnt + 1;
               else
                  dbms_output.put_line('   RECORD EXISTS');
                  exist_cnt := exist_cnt + 1;
               end if;
           end if;
           icnt := icnt + 1;
        else
            dbms_output.put_line('SKIPPED BANNER_ID = '||rec.BANNER_ID);
            skip_cnt := skip_cnt + 1;
        end if;
     end loop;
     commit;
     dbms_output.put_line('Total Records    = '||icnt);
     dbms_output.put_line('Records Inserted = '||insert_cnt);
     dbms_output.put_line('Records Updated  = '||update_cnt);
     dbms_output.put_line('Records Existed  = '||exist_cnt);
     dbms_output.put_line('Records Skipped  = '||skip_cnt);
  END;
  /
  spool off;
  /
  EXIT

  Here are the results I get with 1 id good and a bad id
  
  Error report:
  ORA-01403: no data found
  ORA-06512: at line 15 level
  01403 00000 - "no data found".
  * Cause:
  * Action:
  BANNER_ID = T00001227 - PIDM = 1450 - term = 201280 - cnt = 0
  INSERTION OF
  
  Engage
  
  Here are the results with only a good idea
  
  anonymous block filled
  BANNER_ID = T00001227 - PIDM = 1450 - term = 201280 - cnt = 0
  INSERTION OF
  Total records = 1
  Inserted records = 1
  Put records = 0
  Folders existed = 0
  Ignored records = 0
  
  Engage
  
  Edited by: Withnoe 6 July 2012 14:27

  Put another block of start-end inside the loop (around your select statement) and includes an exception handler.
  Pseudocode here:

  for rec in c1 loop
    BEGIN
        select SPRIDEN_pidm into pidm
          from SPRIDEN
         where SPRIDEN_ID = rec.BANNER_ID and SPRIDEN_CHANGE_IND is null;
    EXCEPTION WHEN NO_DATA_FOUND THEN
      dbms_output.put_line('SKIPPED BANNER_ID = '||rec.BANNER_ID);
      skip_cnt := skip_cnt + 1;
    END;
  .
  .
  .
  end loop;
  

  In addition, if you count the records to see if he has at least 1 card that meets the condition, why count ALL records? You can count and put "rownum = 1" or "" rownum < 2"="" so="" it="" stops="" when="" it="" gets="" to="" one="" row.="" another="" way="" i="" like="" to="" do="" it="" is="" "select="" count(*)="" from="" dual="" where=""> ".

  But often there is no need to count at all. People will sometimes do a count to see if there is to be done and if so, then run. In many cases, it is best to try just to get the job done without counting any first.

• Simple loop on the main timeline

  Hello

  I am very very new to actionscripting, please bear with me.

  I have a very simple banner I want to play 3 times and stop.

  How can I do in Actionscrip 3.0?

  Thank you

  Babs

  Assuming you have an animation of timelinme, a way to do this is to keep the number of times the timeline plays and to stop him when he reached the end of the last run.  To do this, you can add the following code to a layer actions in the first picture...

  var: County: uint;

  {if (!) Count)}
  Count = 0;
  }

  and add this code in the last image at the end of this same layer...

  Count += 1;
  if(Count == 3) {}
  Stop();
  }

• How to make a loop simple counter in labview 7.1?

  I'm trying to teach me how to use labview 7.1, but having trouble finding how to use functions properly. I am trying to create a simple loop to count from 1 to 10 with a delay of 1 second between each number. I would be grateful the help!

  Classes resumed?

  The key words are 'loop' (try a loop FOR the palettte of structures), 'delay' (try a wait (ms) of the range of timing). Use a constant instead of diagram for the "1 second" (or 1000 ms). and use a digital display to show the current number (for example by using an indicator connected to a terminal of the loop iteration FOR). Given that [i] starts from 0, first use a primitive of + 1. Wire a constant at the end of the loop to determine the number of iterations. You should be able to determine the correct value, math or by trial and error.

  Now try to gather all, shouldn't be too difficult. Where have you problems? Have you looked at the examples? Did you do tutorials?

  Once you have a project, post it here and we can propose possible improvements.

• My loop is simple but will not work!

  Hello. I'm having a lot of trouble.
  
  I have a simple loop which goes through and sets a disabled button if its value is the database. The code is below:
  
  DECLARE
  benchmark(loop_count,expression) NUMBER (2): = 1;
  seat_count NUMBER (2);
  item_id;
  Item1 VARCHAR2 (5): = 'SEAT_;
  nom_element VARCHAR2 (10);
  
  BEGIN
  LOOP
  SELECT COUNT (*) IN seat_count
  SEAT WHERE showid =: global .showid
  AND seatnumber = benchmark(loop_count,expression);
  IF seat_count = 1 THEN
  nom_element: = item1 | benchmark(loop_count,expression);
  item_id: = FIND_ITEM (item_name);
  set_item_property (item_id, Enabled, PROPERTY_FALSE);
  END IF;
  
  IF benchmark(loop_count,expression) = 99 THEN
  EXIT;
  END IF;
  benchmark(loop_count,expression): = benchmark(loop_count,expression) + 1;
  END LOOP;
  END;
  
  
  When I run the form, I get 3 guests in a line saying "FRM-41045: can not find the point: invalid ID '.
  If I change the value of
  tem_id: = FIND_ITEM (item_name); TO
  item_id: = FIND_ITEM ('SEAT_10');
  for example, he will work on "SEAT_10" and will disable her, but cannot do through the variable and the loop.
  
  Everyone see anytihng wrong with what I wrote?
  
  Tahnks a lot
  
  Published by: lockmac on May 12, 2009 21:37
  
  Published by: lockmac on May 12, 2009 21:38

  Few things:

  What is the result of the sql query by operating in sql developer?

  From your code, it seems that you must have the items SEAT_1, SEAT_2... SEAT_99 in your form.

  Do you have the number of elements in your form?

  If the values are not there it will give you "article not found".

  You must also maintain in your code, if the element is present or not using something like below after your find_item:

  item_id := FIND_ITEM(item_name);
  IF Id_Null(item_id) THEN
     Message('No such item: '||item_name);
     RAISE Form_Trigger_Failure;
  ELSE
     set_item_property(item_id,ENABLED,PROPERTY_FALSE);
  END IF;
  

  It will be useful.

  Check the answer as useful / OK, if this can help you

  Carole

• Loop timed in LabVIEW DLL does not close

  Hello!  I have what I think, it is a simple loop timed in LabVIEW that stops after 100 iterations by throwing an error and letting the loop 'stop on error.  It works fine when it is executed in the ordinary LabVIEW environment, however, when compiled as a Dynamic Linked Library (DLL) and called from LabWindows it requires me to put an end to execution, rather than going out nicely.  As well, it seems to leave the real appeal of virtual Instrument very well and go to the next line of code, but when my function main() in LabWindows is completed it must always be something not cleaned which is the cause not come out well.  Any ideas?   I tried to add only a call to QuitLabVIEW and that doesn't seem to do it.

  Thanks in advance - hoping you will notice an error really easy. )

  A photo of the timed loop is attached.

  An excerpt from the code of LabWindows:

  int main)
  {
  CallMyLabVIEWDLL();  This line launches successfully and closed the window for my virtual instrument LabVIEW
  MessagePopup ("' My Title:", "That occurs after the call to your LabVIEW DLL" ");    This popup appears - indicating the call to the DLL has finished

  But after the code has completed LabWindows always shows "running", rather than close.

  return 0;
  }

  Why do you use a loop timed in the windows environment?  They are best used for real-time environments (not windows) and tend to have more support than the time.

  Is there a particular reason, a while loop will not work?

• How to create a control of time for the while loop?

  Hi all

  I want to control my time running of the loop. In other words, I want to stop everything in the execution of the loop after a time (in ms) that is defined by the user. For example user defines Control Panel for 5 seconds before a while loop runs and stops after 5 seconds.

  I don't know is it possible with the while loop. I managed with the timed loop, but this must be wrong with my application. Y at - it of the other loops for timed control if it is not possible with while loop? There is also a simple loop with .vi random number (0-1) as an attachment.

  Best regards

  Jick

  Hi again,

  I managed to solve my problem right after I posted my first message. I did it with the passage of time and the register shift (for the elapsed time of reset).

  Thanks for your replies anyway!

  Best R

  Jick

• OR PXI-6561 loop back

  Hi all

  I have a question about the card OR PXI 6561 LVDS...

  I want to make a simple loop back test channels.

  I ' v connected to CH1 CH0 and used the static generation to try to see if the connection is OK.

  but when I'm affecting CH0 ' 1' and I do aquire I see that '1' in CH0, CH1...

  Any idea?

  Hey, Kobi,

  As long as you do the static generation, you should be able to see a high on CH1 if cables are connected.  Make sure the 0 - is connected to 1 - and 0 + is connected to 1 +, and connections are complete and secure.

  There is also a great video to develop test with LVDS to http://zone.ni.com/wv/app/doc/p/id/wv-283systems.

• Measurement of time in a While loop

  Greetings gentleman;

  I'm kinda new to Labview, and although I sought an answer without assignment, I wasn't able to find one.

  So here my question, I would like to know how I can measure the time a loop sequence, in other words, what time is my point of view VI to run the main loop together?

  A little explanation, the attached VI tries to be a Markov chain, it takes some values in the first case structure based on the previus loop, then, if the values are correct, it passes to the next step and so on. It's pretty simple, and yet, my problem lies in the measurement of time. Since it is a 'distribution', it would take infinite time to execute a simple loop if it does not fulfill the characteristics, but it is scheduled to meet them so an average time should work.

  So, if you look to the while loop, should the big one, I want to measure how long I take for a ride.

  Thanks for the help, I'd be happy to read some ideas on how to measure this.

  Kind regards

  IRAN.

  You will find examples in the example Finder OR by searching for 'speed test' or ' reference '.

  Essentially, you create a flat sequence structure inside of your loop. In the first image, you measure the current number of cycles. In the middle frame, you run your code. In the last image, you measure the number of cycles again and subtract the first number of this. This gives you the run time to execute the code.

  You can see a page of the community about it here.

  There is a high-resolution time tick count VI hang out somewhere which is great for benchmarking and improving efficiency, used instead the number of cycles (ms) primitive.

  Edit - remember where he was

  https://decibel.NI.com/content/blogs/EvanP/2010/10/04/tick-count-us--microsecond-timing-granularity-...

• VISA series Loopback speed and precision with double loops and a queue

  I'm working on a test of communication between 2 PCs. I test communication series RS-422 ports by using a simple loop. PC2 wrote continuous data at 38400 baud to PC1 (LabVIEW test code is here). PC1 reads the data and writes the data to the same port as soon as possible. PC2, reads the data and compares to what should be returned. I can get the highest speed is a speed of about 37300. Because it is continuous, finally that I get an error because the buffer overruns (read and write buffers are 65KO).

  It seems that VISA writing takes a lot longer than the VISA read. I do read/write asynchronous operations. I've read a fixed amount of data (1024 bytes) and then queued data to write in another loop. My timeout is set to 0.5 seconds, which is much time opf at 38400 baud (4800 bytes/second). I played a bit with these numbers, and they are the best I can get. If I increase the data read to 2 KB, the queue members increase. If I'm going too low, I start getting the data in the input buffer overrun.

  Anyone had experience with this type of test? The code is attached. Please take a look and see if I'm doing things correctly.

  Michael

  I do not know if this explains a gap between what you expect and what you found in 0.8 seconds, but you have added another level of complication in using the digiboard.  You don't have a real serial port, but a simulated serial port which is hung at the end of a USB bus.  The digiboard software creates a virtual experiences, and so its driver software and firmware on the side of the Board of Directors of the USB bus must manage some translations to go a number of compote, transfer on the bus and decode the Compote number so that it knows which 8 physical ports that it must send the message to.  You can see delays in translation at each end so something in the USB itself Protocol where it needs group information.

  If you have another, a different brand of the serial ports, you can use, you might want to try one of these to see if you get similar or different results.  But I don't think it's a good idea to try to test the limits of a serial communication device using hardware that adds the other layers of the communication protocol and therefore complicated results.

• output to the loop iteration

  Hi people!

  I am trying to use a very simple "loop For" with "16" iterations and Shift Registers starting at '0' and adding '4' on each iteration.

  But I am not successful to display each value in the iteration. Only the final value of '64 "!

  Is it possible to generate the value of each iteration in each loop?

  If this is the case, then could you give an example?

  See you soon!

  
  

• How to trigger several consumer producer loop simultaneously

  Hello

  I'm working on a VI that should acquire simultaneously 2 images and 1 data (of a spectrophotometer). They are organized into 3 loops of different producers/consumers.

  What I want to do is to trigger the 3 producer loops synchronized all the minutes.

  I thought about doing the loops 3 producer in case of events that are triggered by a simple loop with a synchronization feature, but I don't know a convenient way to do it.

  If you can give an idea of how I remove it, or give me an example I'd be very happy.

  Thanks in advance for your help,

  Oscar

  The user of events https://zone.ni.com/reference/en-XX/help/371361M-01/lvhowto/creating_user_events/

• Code Golf: stop two while loops with guaranteed ratio iteration

  Proposal

  In the vein of the tradition of Perl, I would like to see if there is any interest to solve a few puzzles programming in LabVIEW. Can someone post a problem and define the rules to solve.

  Here's a question for beginning/intermediate to sharpen your "palette".

  Description

  With a user action, how you would stop two while loops such as the relationship between iterations is the still the same? Concrete to view this situation is to take action: both instruments use the same source of synchronization to take measures, but second divides the clock down so that it is a little slower than the first whole factor. For example, if the slower instrument is four times slower, then at the end of the VI, the slower instrument takes 100 measures the fastest instrument took 400.

  Rules

  • You can use vi.lib
  • You cannot include any other subVIs
  • Your solution should pass for loop1 interval as low as 25 ms

  Model (joint in LabVIEW 2009)
  

   

  If people are interested in this, then we will find a way to improve future problems. Please post your suggestions and criticisms, but only if you also post a presentation ;-)

  MacNorth wrote:

  [..]

  If we choose the first suggestions, the VI has yet to recover the data at different speeds. You can dedicate a loop for each instrument to disassociate a jitter and latency introduced by their connectivity or the inner workings. This adds a margin of safety when there is a conflict of thread and the pilot. You can also implement a simple counting as altenbach loop and renounce the multiloop complexity.
  [..]

  It is a very good point. But I wanted to make sure, you should / need to discuss the benefits, but also the disadvantages of the design. Implementation of an application is most often a process of 'special cases '. If a framework/design for a single application model does not necessarily correspond to another application.

  Designs are always strongly according to the requirements and constraints. What gives here designs will result in educational services, of course, but not necessarily as reference models for specific applications.

  Advantage of simple loop:

  • No synchronization between several loops required
  • Can easily implement any whole factor between services (quotent & function remains for a case structure

  Disadvantage of simple loop:

  • Take advantage of the multi core systems (at least not much)
  • Can easily run out of the time constraints (material not "not responding" enough, fast manipulation of data takes too long,...)
  • Code will accumulate within the structures of the case, where the readability could suff

  The advantage of multiple loops:

  • See essentially the disadvantages of single loop (several loops solve those)

  Disadvantage of multiple loops:

  • More complex, especially for the sync switch (not beginner friendly, requires a more/better design)
  • May contain easily questions source such as race conditions and locks

  A little side note:

  Even if the equipment works different acquisition rate, this does not necessarily that the software must use different rates for data extraction. You can use the same model of an hour, but get X times more values for the task faster than the slower running. The 'only' thing to care of are the sizes of buffers and bottlenecks in the data transfer.

  MacNorth wrote:

  [..] The best advice published OR shutter multiple while loops (https://www.google.com/search?q=labview+stop+multiple+while+loops) are laughable (and the 'solution' in my model). [..]

  No, it's not laughable. For many applications, this approach to shutter at the same time several loops running is OK. The constraint: only for simple parallel running loops.

  More complex loops (producer/consumer and similar) with the more complex data relationship ships require more valiant approaches such as queues, declaring events or user.

  My 5 cents only,

  Norbert