variables local vs DataFlow

Similar Questions

• Value of the variable local not even as indicator

  I use enforcement to highlight to debug a problem. I noticed that when the front panel indicates the Boolean value true, the execution has highlighted this is show as false.

  Why would such a thing happen?

  My request is based on the continuous acquisition model. The problem I'm trying to debug is that somehow my application don't ignore the sequence error when I want it. I thought that it isa condition critical competition, but with highlighted performance I expect to see it happen and I did not.

  I have attached the screen show and the vi. I'd appreciate any help.

  Thank you.

  All shows this small 'F' near the tunnel of the structure is the value of the local variable was the last time it was read. the 'F' will not change magically to something else until the next time the local variable is read, and which depends entirely on the rate of this loop loop. When you perform a execution highlighting, loop rate is very slow and since many other places write so that the indicator via local variables, has no way to tell, from the diagram, that given its value at a time. Only the façade shows the current state, that's what the façade is.

• Pass variables local to a called asynchronously VI

  I'm looking at the example of the sequence, "Live LabVIEW Express". In this example sequence, there are two screws that are configured to run asynchronously. In VI "Display signals", a reference to the local sequence "StopDemo" is somehow passed to the VI of control with the output button on the VI, then the sequence stops. I don't see how this reference is passed to the VI of the sequence. I know how to do it using the typical step Types to call screws, but I don't see how this is done with the type of step "Run VI" asynchronous.

  Help.

  Hi settlesj,

  The user interface for asynchronous operations is slightly different from the 'normal' procedure  If you click on the small button "VI to" as part of the stage, you will see the settings in the dialog box that appears.  For this specific example, you can see how StopDemo is written from the VI:

  

• Design mode makes variables local as a parameter to a UIComponent

  I created a new application mxml with the following code:

  < mx:Script >
  <! [CDATA]
  private var message: String = "My Message";
  []] >
  < / mx:Script >
  < mx:Text text = "{message}" / >

  When I click on the Design tab, it displays the text {message}.
  But I would like to see the text of my Message instead.

  Repeat what said David...

  Design view will make only content not dynamic, which includes localized strings. Design view will be only reander literal expressions (label = 'literal' vs dynamic expressions such as label = "{foo ()}"or label = "{this.variableName}" ").

  To display the dynamic content, you must run the application.

  Jason San Jose

  Software engineer, Flash Builder

• sons are better than local variables?

  Hello

  I built a vi that eventually became huge with lots of sequence and case. Local variables of course reduces a lot of threads, but at the same time consumes memory. So those who are better? son of current throughout the vi or local variables?

  Concerning

  Simo

  The sons are better.

  DataFlow vs Local Variables

  variables local vs DataFlow

  Another question on local Variables and their use

  Why some people say that local Variables are bad

• By the way the local variable to sous-suite

  I have a sequence that sets a local variable, Locals.LowPassFreqGhz = 1,800.

  Then it executes 5 subsequences.

  The Local is set to a new value and then the same 5 subsequences are re-run.

  Now I have new model numbers where the pair is different and will soon have models where there are groups of 4 frequencies instead of two. That is why I would like to put the 5 seqs in a following and pass the freq based on a select statement. In my limited understanding and knowledge of TestStand, I think that the sous-suite would have its own Local.variables. How should I move this local to a sous-suite, convert a File.global?

  Thank you

  JVH

  The subsequence could have its own inhabitants, but you must use the parameters to pass to residents for the most part in the subsequence. See Chapter 1 of the section and the reference of TestStand sequences on manual.

• Local property node on the VI Analyzer VS variable

  Hi I'm preparing my review of CLD. I had this problem...

  I learned that there are two methods to update the icon on front panel using the value of the variable local node and property

  It is not a good method to update an indicator using these, but if we want to update a control, then there is no choice...

  CLD NOR recommend using the property instead of the local variable node, but when I run my code on the VI Analyzer he created an event

  believing that it is better to use a local variable for good performance...

  ???????

  Yes, the text is correct. Property nodes are useful to access things like visibility and string [] in the control of the ring, but for the value, it is much slower than a local variable.

  One of the advantages is that there wired error so you can force the data stream, and given that the nodes property are executed in order, you can use a property expanded node to find out what order things occur, especially compared to a free local and free property node, in which case you would be forced to use a sequence structure where ofc is a bad solution.

  /Y

• Comparative analysis of local Variable Transmission times

  Is it possible to compare the time of transmission of local variables?

  I ran some stuff simple reference before, but never something that would understand how long we had to to get a piece of data in a local variable.

  I have attached a simple program that sends information via a local variable, and there is obviously some lag which is visible, well, I'm running at least visible on the system. I know that this lag depends on the system, the program runs on so I would really like to find a way to test it on the PC we use here.

  Any ideas?

  -Ian

  No, they are not the devil as long as you are aware of their capabilities and their limitations.

  Regarding "some applications cannot always use queues or notifiers accomplish certain requirements", give me an application where you cannot use a queue or the declarant, and I bet you can.

  The problem with your 'reference', is that it's a bad test.  You do a visual aspect to two parallel while loops that have no synchronization between them.  If you used a wait until the next msec in both loops, you would see then better synchronization.  Download the file read out of the loop that could cause a random delay.

  And the biggest concern with local variables is "conditions of competition".  Search the forums to learn more about them.  You cannot control this piece of code is running in what order.  If you have two parallel two loop iterations, if the value is written to the local variable before or after that the local variable is read and written to the other indicator determines if a value new or old is used.  If it's an old value, it will be a new iteration of the loop at the bottom before it is updated.

  Search the forums for the terminals of variables local vs vs property nodes, and you will see that the local variables updated the order of milliseconds.  The only reason you see 'in the Kingdom of less than 250 ms' is because it is the rate of the iteration of the loop at the bottom.

• Share the expression in step.result.numeric and locals.variable

  Hello together,

  I'm new in the world of TestStand and I have a simple question.

  How can I share the output of a step between the expression step.numeric.result (NumericLimitTest) and a variable 'local '? I need the output of a time step value for the comparison of the limit and once to give to the next step.

  Thank you

  Dusan

  
  

• Structure of the event to local variable

  Hello

  I use a control structure and the table event to detect changes in the value of table.

  At the beginning, I have made changes in the table (for execution) and structure of the detected event.

  The next step was adding a parallel while loop in which I write for the control array (using the local variable).

  During execution the layout of the table changed indeed, but the structure of the event is a not detect it.

  I have attached 2 digits: 1) loop of the structure of the event 2) the parallel loop.

  It is possible works in such a way?

  How can I make the structure of the event to detect changes in the software in the control array?

  Thank you

  Leonid

  Changes made via a local variable are not the user events, so the structure of the event will not detect by definition. You must write to the command by using the property node "Value (follow the signs).

  That said, your small watch of your code starts to raise red flags in my mind with the use of variable and global variable local. While it's not bad, their abuse can lead to the poor programming architecture and race conditions. Perhaps you should consider downloading your VI any kind can someone take a look and offer suggestions on improving it.

• How 'local' are local Variables?

  I avoid local variables at any price so don't have much experence with them. Local only 'local' to the subvi in what they are or if you have used the local variable from sale in several subvi in the same program would be that they all share the same varaible?

  I got the task of determining a LabView program that we had subcontracted out. The device, on which he works has three identical modules that are used for the profile and discharge profiles for different types of batteries. In any case, the program has a bug in it where all three on screen V / I charts show the same V / I have curves.

  My original thought CD was the subcontractor got the program works on a module, then reproduced the code to the other two. But did not take a new graphics or was referencing the V / I module of measure 1 in charts 2 and 3. First glance on the code it looked like it should work fine.

  Digging deeper, I see the contractor makes this sup - vi to build the cluster for a waveform graph. In this sub - vi he used a table variable local, called "local".

  When he repeated this for the other two modules, he used the same variable local "local array. Since all three "programs" (one for each module) operate within a larger loop would not all be read and write to the same variable local "local array?

  I have attached the origonal sub - vi (V_WFM.vi) and one of my replacements (V_Wave_1.vi), I've made three copies of my vi and each module will get its own sub - vi.

  I'm not doing correctly?

  
  

• local variable and high Ribbon

  I copied a VI to control the DSA8200 Tek to manage the DSA8300. I guess that all controls remain the same.

  The new DSA8300.VI is attached. Why does show DSA8200 in the top Ribbon on the front panel?

  And when I search this VI "8200", I find a local variable called "DSA8200.vi". How to change that to "DSA8300.vi"?

  I am also attaching ScopeDialog.vi, because it is called by DSA8300.vi.

  Thank you.

  efarr wrote:

  If you can shed some light on why it happened, I could learn something.

  A local variable is the name of the control on his face and that's all the information you need. If show you right-click on any variable local and it the label, the label will be the file name of the container VI. Since you have already changed the name of VI, it has already changed to DSA8300.vi. Since it is redundant information, there is no need to ever show him the label of a local variable.

  I have never shown a label of a local variable before, it was new to me too.

• local variables of power question

  Hello

  Attached, please fine 2 similar vi. WhileStoop.vi, I can start or stop the program at any x + y values.  But, in eventStoop.vi, I can not use stop when the program is running (program will end when x + y = 10).  Why the variable local power not working in my eventStoop.vi?

  Thank you
  Chuman

  It's a bad idea to have an event structure that contains code that takes a long time to run as the while loop inside the case in your situation.

  Probably, he doesn't stop because you have locking front panel until the event of this case ends checked.  So when you press the Start/Stop button, the same case runs and performs a while loop start running.  But because the cover is locked, it can not detect the change in power again which is necessary to stop the inside while loops.

• When you define a local variable Nvarchar2 inside a package, it is always NULL

  Hello

  I have a transactional package and inside, I declared a variable local nvarchar2, who then, after you have set it, go to another package which has as parameter. The strange thing is that when we created the local variable within the package it keep defined with the value 'NULL '. I tried using the definition of a fixed value, N «...» ', CAST, TO_NCHAR with the same result, the NULL value.

  Outside the package, trying the same code in a SQL Windows it works fine. Someone at - it to cope with this problem?

  Thanks for the help.

  Kind regards

  Andres. -.

  And where is the output indicating that "pin_calc_empr_ruc-online v_ruc2" winds being null?

  This code works for me:

  create or replace procedure test_nvarchar is
  v_ruc2 NVARCHAR2 (15);
  Start
  v_ruc2: = "123456789";
  test_nvarchar1 (p_nvarchar-online v_ruc2);
  end;
  /

  create or replace procedure test_nvarchar1 (p_nvarchar nvarchar2) is
  Start
  dbms_output.put_line (p_nvarchar);
  end;
  /

  exec test_nvarchar;

  123456789

• How to read values from property XMLfile into BPEL process local variable?

  I would use a file of properties with certain parameters, for example
  
  < myparm1 >
  12345
  < / myparm1 >
  
  How can I read from a BPEL process such a property XML text file and assign it in by example variable local 'intparm1 '?
  
  Where (what directory) should I put this XML file property it is always available for playback?
  
  Peter

  Hello

  You can also use

  ORA: readFile () function as follows:
  ORA: readFile(xml file location (ex. "file:///D:\\SOA\\FileAdapters\\readFile\\test\\test.xml"),xsd file location (ex.» fichier: / / / D:\\SOA\\FileAdapters\\readFile\\test\\test.xsd») "))

  inside the activity assign assign to the variable you want.

  concerning
  arababah

  Published by: arababah on August 10, 2009 12:55 AM