update of local variables

Similar Questions

• Update zone drop-down list programmatically does not update its local variable

  Hi all

  I followed a Web site tutorial OR and programmatically change the items in a drop-down list box. It worked successfully, but not for local variables. Local variables while keeping the elements that had it before.

  Any suggestions?

  Thank you!

  

  You must update programmatically property value to change which returns the local variable, the value that you will wire does not match with one of the array strings.

  Maybe you need to do something like this to update your value to change the 'Two' to 'five '.

  

• FOR loop does not update the local Variable

  I am newer to labview, and I can't wrap the head around why not a habit of local variable to update in the code if it updates on the dashboard. Anything im missing?

  Assume that you are talking about the local variable of the 'State of the cell. The terminal updates every 500ms in the small top loop, the local variable indicates simply that the indicator and thus updates also.

  The problem is "dataflow" and you need to familiarize yourself with the concept!

  Once the while loop starts, the local variable is reading and inside the loop begins. Most likely, the local variable is read before it is updated in the small loop, so most likely returns the value of a fade on the first iteration of the while loop. Now the small loop continues to go twice per second for about five seconds. Only after the loop FOR (and everything else inside the while loop) completed, the while loop will go to the next iteration, date on which the local variable is read once more, this time with the last value of the last for loop iteration of the previous iteration of the while loop.

  In summary, the local variable updates very well, it's just that the code does not read the new value around most of the time.

  Your VI is full also potential competition conditions caused by the over-use of the local variable. You need to respect the proper execution order by eliminating local variables.

  So what is the solution? Hard to say without knowing what the VI is supposed to do. Most likely, you will need to remove the inside OF the loop and use it outside while loop for everything.

• update with local variables

  Hello

  I'm sure that this should be easy for the LV user, but I still get angry with the case.

  In the circle 1 Gauge_error has the value true, but when it happens in the circle 2, it is set to false (which is the default).

  I don't understand why because between the circles is true, as it should.

  I know I did something wrong with this local variable. I tried with the property node: value but the problem is still there.

  Thanks for your help.

  

  It's a classic race condition and is precisely why you should not use inhabitants. You assume that the second room is read after the first local in. Absolutely not true.

  Really, really work to replace the premises with a wire.

• Local Variable is NOT being updated?

  Hi all

  Please see the attached picture for the problem that I am facing. Basically, I want to open multiple files in a folder and file names allows you to derive the other names of files in a different folder and plot the data in all the files.

  Here's what I do:

  1. use the file dialog box to select files

  2. create a local variable to 'selected files' - see below

  3. derive from new files "new files" using the "selected files" and make a local variable of the "new files".

  4 plot data of "selected files".

  5. Drawing data from the files of 'new '.

  The reason for the local variables is that I will access files original and derived from many places in my VI and I want to avoid the eternal wiring or by opening the file several times dialog box (less clicking - my figure of index hurts )

  Problem: Data from "selected files" get traced. However, given "new files" are NOT given in the 'new' files to run it, but run a previous data. Apparently, the local variable "new files" does not get UPDATES

  with the "new files" of the current run. I have to run my VI twice. Why is this? How can I solve this problem?

  

  
  

• How is it my local variable is not updated its value compared to what is happening in the while loop?

  Hello

  I am trying to extract data from a time that my statements updated in what concerns the number of loop iteration. I tried to use the two local variables and travel records, but without success.

  I also did the following example: http://www.ni.com/white-paper/7585/en and it works like a charm.

  I've attached the PNG file with declaration of the local variable circled in red. Join a VI in the next respnose.

  Thank you

  No, the two while loops are stacked and not parallel, which means the outer loop cannot go to the next iteration until all code in this document, including the inside so that the loop is finished.

• Change local variables with dll c#

  Sub AppMgr_UserMessage (UIMessage uiMsg)

  {

  Try

  {

  switch ((int) uiMsg.Event)

  {

  10200-case: //update the UI to reflect the current status

  progressBar.Value = (int) uiMsg.NumericData;

  label. Text = uiMsg.StringData;

  break;

  10201-case: //Close form, cleaning of the AppMgr reference

  AppMgr = null;         This. Close();

  break;

  //=========================================================

  10202-case: / / send the text to the caller App test bench

  label. Text = "10202."

  uiMsg.AsPropertyObject (). SetValString ("Locals.opText", 0, "Something");

  break;

  //===========================================================

  It is a code in your example of Panel floating .net

  In the last case above trying to change one of the local variables of the test bench. I think that it is probably not wise to cast as a how PropertyObject uiMsg which I have here.

  I think it is more likely that I'll have to pass the variable I want to change benchmark to the DLL.

  Don't know how to do this, any ideas?

  Hi Krugman2,

  To do this, you need the coresponding SequenceContext!

  Try uiMsg.Thread.GetSequenceContext(0,frameId). AsPropertyObject()

  Maybe this thread could be interresting:

  http://forums.NI.com/NI/board/message?board.ID=330&thread.ID=17870&view=by_date_ascending&page=1

  Greetings

  Jürgen

• How to set multiple values clustered with local variable?

  Hi all

  Okay, I made my way through Labview for everyone and have some basic concepts down. I can see with a cluster, if acting directly on it, you can ungroup, change values, rebundle, etc..

  I try something a little more complex... and just do not know how to start on this.

  I have a menu menu ring set. I created this with a typedef, with 4 values.  I used this typedef 7 times, more a few LED bool, in a cluster. I made this cluster a typedef.

  Therefore, in my main vi, I started designing, I put an example posted here... and inside, I have two instantiations of the typedef cluster commands selection of left and right.

  I dropped in this vi, a copy of the menu ring typedef (same typedef as in clusters, values) called reset all tubes.

  Now, I am trying to understand how, with an event to change the value to 'reset all the tubes'... that I can start with the left switch and change all tubes (here is the menu ring selector) to the same value as what has been selected with the ring of menu 'Reset all the tubes'.

  I created a local variable for the selector on the left. It is configured to read values. (I'll be doing the same thing with the right too, but just to start with the left).

  In the examples I've seen where access to a cluster, you could ungroup the cluster... browse and change the values... maybe pull out all the "hits" in a table and go through to update the values.  And when you group or ungroup the bunch... you can see the values, etc., when you stretch on the block diagram.

  With the local variable... I do not see to 'stretch' it as I expected... so I can access the values "tubes"... and all at the value of the 'reset all the tubes' ring menu value.

  Someone can put me on the path on the best way to do... or is it a component structure I'm missing here?  Am that I on the right track everything first here?

  It seems pretty basic to me, but miss me just something here on the way to start...

  Thank you in advance,

  Cayenne

  You can't do this with a for loop of how the Department is structured, but why make it so complicated?  Just group the new value in the cluster, as shown below:

  

  If you do not want to use a loop for example, consider the restructuring of your cluster.  Group ring and a Boolean value in a cluster, and then unmold 7 of those in the cluster of selector.  Then you can use 'cluster to the table' and 'picture of cluster' for all elements of the external cluster will be of the same type.

  Also, be careful when using rings in the form of type definitions.  You probably want to use an enumeration instead.  The elements of a ring do not update the when you update the type definition because they are considered to be cosmetics. the elements of a definition of enumeration type update, because the elements of an enumeration are considered as part of the data type.

• 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.

• Remove the array without the local Variable element

  I am wanting to know if you can remove an element of an array, the index of the removed part.

  and update the value in the array to not include the deleted part of a more direct way than the following:

  

  Or, in my program, the table is initialized with some clues that makes the task of removing an element of

  table, the part removed from indexing and updating the table includes only not the deleted part similar to the following:

  

  (a) is there a way to do this without having to use local Variables?

  (b) I would be so concerned to rid my program of all local Variables? (even those who don't create race conditions)

  Keep the table in a feedback node initialized in the world. Do not imply not objects of façade.

• How to access settings/local/variables, who went through referenece?

  Hello

  I am new to NOR teststand.

  A single sequence file (file1.seq), I called another file of sequence (file2.seq), which I spent the value of parameter by reference (Locals.Driver)

  Parameter is Local that contains string variables.

  In File2, I want to replace the value of Locals.Driver.

  But I'm not able to access past variable reference (Locals.Driver) in File2.

  Please tell me how to use this variable in File2.

  Settings are accessible using "Parameters.variable".  If you pass by reference, you just put this setting and it will update the local section that allows you to call the sequence when the sequence is complete.

• Local variables are comparable to the value property of a control or indicator?

  I use the buttons / switches mechanical locking action, event structures and local variables to track the status of my switches.  I used local variables with indicators, too.  Now I see that this could be done via the node property of a switch or an indicator.  Should I use the nodes property instead of local variables?  Should I use "switch" mechanical action and control the State of the control buttons / switches?  I used a mechanical locking action because it automatically reset when it is read, but who pushed me in the use of local variables.

  I know the property values to adapt the data flow model, while local variables might be placed in a sequence structure to ensure the order of execution.

  I just don't want my program all except if it is a correct approach.

  Thank you

  DH

  Dark Hollow says:

  Well, I'm changing the properties of user interface in my state machine.  For example, when you push a button to START the TEST, I want to disable and gray this button and activate the button to STOP the TEST.

  No engineer too much. In this case, you can use a single button and label the FALSE case a 'start Test' and the REAL case as TEST 'STOP '. No additional code needed at all. At the same time, you only use the half-Panel space! (and 10% space diagram!)

  Dark Hollow says:

  Another example... I have a couple of dozens of LEDs on the front panel to show the TEST SUCCEEDED.  If I have the wiring all of them, my state machine diagram gets messy.

  Define disorder! In my mind, code is not held together by wire is much messier because it is impossible to determine the order of execution and so program logic. A thread is a small 1 d object. A property node is a significant 2D object. 20 wires are much less messy than 20 knots of property, especially given that each property nodes still hanging by a thread in one way or another!

  In order to reduce the number of threads, use the most appropriate data structures. Instead of a few dozen sighted use a single Bay of LED. A single wire! Keep the table in a shift register and update alone LED as necessary by using "replace subset of the table".

• stage of statement do not write to the local variable

  I have a 2 local variables that are custom data, type, a container with 2 numbers u64, I am trying to assign numbers of these variables by using the stage of the statement, but variables do not change, here's my statement:

  Locals.excelStartColRow.Column is 1ui64,
  Locals.excelEndColRow.Column is 3ui64

  I don't get any errors, but the values not updated so the VI I use these variables by fails, any ideas?

  == is a comparison.  You want to set a value, that is =

• Direct local variable data VS

  Hey!

  I do LV Core 3 and hope someone enlighten me more... (Excersie 7-2 Solution more about 01:50 in the video to be more precise)

  According to this module, an indicator that is updated very frequently must be connected with direct data and not a local variable. Research assistance he said local variables to make copies of the data.

  It's a bit like this:

  1. I have an indicator that is 'coupled' to the X position of the memory.

  2. If I write a light directly he wrote directly to the X position of the memory.

  3. If I could write instead through a local variable... It would first create a copy of the data to write to the position indicator Y memory and then copy it to the X position of the memory?

  Thank you

  Peter

  Yes it's true.

  Now, imagine if you have a very large painting (and the elements of array must be States.map in memory).

  the first memory manager must find a place in memory where it can hold the table and you now have a memory more occupied by the local variable location.

• Notofication, local variable which is the efficient education Department

  Hi, I want to pass a variable to loop A loop b, I wonder which is more effective, the Notification or local variabe?

  Well, both are equally effective. If it's just a one-way road loop A loop B, you can just use a local variable, but you can run any questions if you need all the data. If the loop of the local written writer then there is no way of knowing whether the other loop has already read, so it will crush him. Also, the receive loop has no way of knowing if the data has been updated. If the receive loop needs that value the latest then you can go out with a local. But you must read continuous him when a notifier allows you to just 'wake up' the receiver loop when the value is written.