Strange for the behavior of loops

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  I wanted to say break LOL

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• Security for the family login loop

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• For the verification of loop fetch

  Hi experts,

  As everyone knows, for loop taken 100 lines per each iteration (network roundtrips to 100 by default). Please, if it is correct me if I'm wrong, I know the following codes are the same.

  
  

  for rec in (select * from employess)

  loop

  do_some_work

  end loop;
  

  
  declare

  cursor c is select * from custtable where rownum < 10;

  type of my_t is table of c%rowtype;

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  loop

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  My question is, when I try to check the FOR LOOP to retrieve the query 100 lines per iteration, I use view v$ sql. However, it does not work. Because the PL/SQL block is ready. I need not to see that the sql that is used in the LOOP FOR query. So, what should I do to check that the extraction of LOOP FOR 100 rows per each iteration? Dynamic operating modes should I watch?

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  You can simply enable SQL_TRACE and check. I used a TEMP table that has 1000 rows.

  SQL > select count (*) temp;

  COUNT (*)
  ----------
  1000

  SQL > alter session set sql_trace = true;

  Modified session.

  SQL > alter session set tracefile_identifier = "kar28042014";

  Modified session.

  SQL > start
  2 for i in (select * from temp)
  loop 3
  4 null;
  5 end of loop;
  6 end;
  7.

  PL/SQL procedure successfully completed.

  SQL > alter session set sql_trace = false;

  Modified session.

  If you see the trace output, you can see 11 extraction operation is done. 10 * 100 = 1000 read lines. The extra 1 extraction is to check if there is nothing else to look for.

  Parsing user id: 191    (recursive depth: 2)
  Rows    Row Source Operation-------  ---------------------------------------------------      1  SORT AGGREGATE (cr=14 pr=0 pw=0 time=883 us)  1000  TABLE ACCESS FULL TEMP (cr=14 pr=0 pw=0 time=185 us)
  ********************************************************************************
  
  call    count      cpu    elapsed      disk      query    current        rows------- ------  -------- ---------- ---------- ---------- ----------  ----------Parse        1      0.01      0.00          0          1          0          0Execute      2      0.00      0.00          0          0          0          0Fetch      11      0.00      0.00          0        23          0       1000------- ------  -------- ---------- ---------- ---------- ----------  ----------total      14      0.01      0.01          0        24          0       1000
  

• For the behavior of the loop in OSB

  Hi, I have a step in the proxy request pipeline that has an error handler.
  
  Inside of this point, I have an action "for". My request is if an error occurs during the iteration of the loop for and if I use the action back in the error handler it will return to the same loop iteration for?
  
  Thank you
  
  Published by: 04111986 on November 30, 2012 19:35

  Nope, he abandoned the current scene altogether and continue to the next step...

• For the question of loop/formula node/Maj register_Beginner

  Hello

  I am a beginner of Labview and have a newbie question. I think that's most of you very easy, so please try to help me soon

  I (X, Y) datavalues... I calculated the average arithmetic using a formula node and a loop for and got (X', Y') out. Now, I want to take the output X' and Y' and calculate an average value in reference to X and Y. Thus, the same calculation in the loop for, but I want to take the output values and feed values again under the entry name. This should be played N times and routes.

  I tried using shift registers, but failed to connect properly as I can get what I want. I have attached here this part of my vi where I have the problem. I hope you can help me. Thanks in advance.

  Hi Sarah,.

  If you need to put the X "-paintings in a registry change, while the original X table remains constant:

  

• "1 MHz" for the name of the source on the time loop does not work on LabVIEW Real-time 9.0

  A Loopis Timed running as expected if a time source is manually chosen in the dialog box of configuration for "1 kHz" (first digit) and "1 MHz" (second digit). If the time Source name is set through the input of the channel "1 kHz", the loop is executed, too third figure). But if the input string is "1 MHz", the loop is not executed (last figure). The channel two are created by "create constant" on the entry of the loop to exclude typos. Is it possible to set the Source of a loop time timed through the input string to the real-time clock hard Mhz?

  

  

  

  

  OK, I was a bit confused by the difference between the behavior of error...

  Now, the question is quite clear. Aid for the timed loop provides the following regarding the Source of the calendar entry:

  Specifies the name of the synchronization source to use to control the structure. The source of synchronization must be created using the create synchronization Source VI on the block diagram or selected in the dialog box Configure the timed loop .

  So, I think that you have somewhere in your code a time Source.VI create if you pass "1 kHz" as the name. But you did not do this for your clock "MHz 1"...

  hope this helps,

  Norbert

• While loop, wait for the function and the stop button!

  Hello

  I have a while loop and a stop button. Inside my While loop - I have a 'Wait (x ms)' function. If I press the stop button, it does not block the program immediately, he expects ms x then stops the program. How can I get rid of this?

  Thanks in advance for the help!

  
  

• Create a table in a loop 'for' (reset the number of loops)

  Hello

  I try to incorporate a signal of acceleration from an analog input CRIO to get speed and then further integrate to get the moving of a vibration system.

  I understand that to achieve integration, a table must be fed in. My problem is that I could not buffer the signal in a buffer block, as I couldn't find buffer blocks. so I decided to create my data table by using a loop "for". The nests of the loop 'for' inside a timed loop. The problem that I'm stuck on is how to reset the loop 'for' in order to fill the buffer with each iteration of the outer loop timed.

  I enclose the code if that helps. Note that I use labview in 2013.

  If anyone who has encountered a similar problem before can help me, I would be gratefull.

  Concerning

  Ali

  You can use a shift register initialized as inputs to your curls, to build your table of one. However, you realize, don't you, that the execution of your program as written loops as soon as the computer can spit out responses, then the output array may contain several points that took place before the entry has updated? Assuming that your thing cRIO (I've not worked with these) has integrated into its routine acquisition of calendar data, I suggest you put that inside the loop to get a data point by reading.

  And do you really want your graph to distance for update only every thousand points (points of acceleration million) speed?

  Cameron

• Save 1 array in a loop for the other run cycles.

  I have a function built into a N = 65 for the loop that pulls down real-time data in table.    On the first loop, a table for "calibration" is created that needs to be saved as a reference for measures in the next 64 executions.

  Anyone know what I need to do to save this first set of data, so I can continue to use it?   On the next run, the function extracts completely new data and replaces naturally.

  For the moment, I don't have a source VI to post (that works), sorry about that.   Will try get ot something tomorrow... but it will probably not work.

  To be a little more exactly...

  

• Programming of a conditional FOR the timing of the STOP button on the loops

  I have a conditional FOR loop with a STOP button, however, the nature of LabVIEW data flow, the stop button is now being questioned at some point before the end of the loop. A control not having no entry, I can't connect to the last operation of a single iteration of the loop to trigger the vote on the STOP command, and I prefer not to use a flat sequence just for the power button if I can avoid it. I've considered using a structure of the event, but I don't want to force the loop to wait that the stop button to be pressed, I want just the loop to EXIT, * IF * the stop button is pressed... but I want the stop button to be questioned at the end of the loop, so if the user presses the button stop at any time in the loop , at the end of the iteration, the loop will end... that makes sense? At present, given that the stop button is called once at some arbitrary during the iteration of the loop time, if the user presses the stop button after he is questioned, the loop must run an extra iteration, and I don't want that to happen.

  ... in any case, I guess I'm looking for a more elegant way to implement that having to use a flat sequence just for the stop button.

  Sorry, but you'll have to use a sequence structure.  This is why they are there.  Sometimes they have their purposes.  Here is how I would handle it.

  

• 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

• Restarting a task for the acquisition of data inside a For loop

  Hello

  I need iterate through my acquisition of data. Currently, I'm doing this through the creation, implementation and tasks for the acquisition of data inside a loop For which is iterated according to the needs of compensation. Unfortunately, the creation of these DAQ tasks slow down my code.

  I would like to be able to create the tasks outside the loop, pass them in and revive the tasks at the beginning of each iteration. Is there an easy way to do this?

  Otherwise, is there a way to make the standard DAQmx digital startup trigger trigger several times (so that it starts each pulse data acquisition in a long pulse rather than just the first pulse train)?

  Thank you!

  -Evan

  I whent before and created this example for you (and many others.)

  

• clear the table of loop for

  Hello world

  I have a question about the erasure of history to the table. It sounds simple, but I'm really confused...

  As the example attached below, I've built a table within a while loop and a loop. After totally run the program once, when I run it a second time, it seems that the table has a memory of the last time, that is the size of table does not start from 0, and appears the old number from last time, even through its initialization of the for loop.

  How can I make it go empty each time when I restart the table?

  Need your help. Thank you very much. : )

  You must also have a shift in the loop FOR. This will keep the data for the duration of the program, but it clear at the beginning of the next run.