Using local variables to 'clean up' diagram

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• using local variables in the help of calc

  Hello
  
  I am trying to use local variables in a calc by declaring two variables and then referencing these two variables to do some math. However, I get an error: error: invalid member name 1012004 [Cumulative_Biscuits]
  
  Anyone know why it gives this error? I'm he declare incorrectly? Here is my code.
  
  
  
  
  
  ESS_LOCALE English_UnitedStates.Latin1@Binary
  
  UPDATECALC OFF SET;
  SET AGGMISSG
  SET CACHE HIGH;
  SET CREATENONMISSINGBLK
  
  
  var Cumulative_Biscuits, Average_Biscuits;
  
  Difficulty ("New York", "Cola", "Budget", & CurrYr, & CurrMonth)
  
  / * Calculate the Cumulative cookies for 24 months * /.
  Cumulative_Biscuits =
  
  @Sumrange ('cookies'-> 'Real', @XRANGE (PriorYr02-> PriorMonth02, & PriorYr02-> Dec)) +.
  @Sumrange ('cookies'-> 'Real', @XRANGE (PriorYr01-> Jan & PriorYr01-> Dec)) +.
  @Sumrange ('cookies'-> 'Real', @XRANGE (CurrYr-> Jan & CurrYr-> PriorMonth));
  
  / * Now calc average 24 previous months * /.
  Average_Biscuits = Cumulative_Biscuits / 24;
  
  ENDFIX
  
  / * Now to spread the calculated average above for the next 20 months in the current scenario * /.
  
  
  Difficulty ('New York', 'Cola', 'Budget')
  / * End of month will always be Dec here * /.
  Fix (& CurrYr, & CurrMonth:Dec)
  
  "Cookies" = Average_Biscuits-> & CurrMonth;
  
  Endfix
  / * Month will always be Jan to Dec here * /.
  Fix (& NextYr, Jan: Dec)
  
  "Cookies" = Average_Biscuits-> & CurrYr-> & CurrMonth;
  
  Endfix
  / * Beginning of month will always be Jan here * /.
  Difficulty (& NextYr02, Jan: & NextMonth02)
  
  "Cookies" = Average_Biscuits-> & CurrYr-> & CurrMonth;
  
  Endfix
  
  Endfix

  Maybe this will help you too:- Re: calculation with temporary variables does not work

  See you soon

  John
  http://John-Goodwin.blogspot.com/

• How to read the values of the variables of façade in loops without using local variables or property value nodes?

  I know that local variables and nodes of property value are causing a lot of problems.

  But if I read the value of a variable front outside a loop.

  the value is only read once before the start of the loop.

  Changed the front variable values during the iterations of the loop, is invisible.

  How can I solve this problem?

  
  

• I want to fill and empty a tank automatically that can be achieved without the use of local variables?

  Labview gurus,

  I have a project to complete and I'm new to labview, I have the 2009 version of the student. and want to build an initial vi of a municipal plant to FILL AND EMPTY TANKS. I use the DSC module to help and I can get my tanks to complete a sequence, but it uses local variables. They cannot be shared on the network when I create my libraries.  Need urgent help...

  Casey74

  Here's a quick attempt at a state machine. See if it makes sense.

  (It can be simplified a bit more!)

• Another question on local Variables and their use.

  I have read many many posts on forums how we avoid the use of locals at all costs because they go against the stream of LV paradigm however I tried to find a way to replace them in my programs and do not have.

  Basic explanation:

  I use a state machine to browse specific validation test steps and test of electronic equipment of base. (Panels, timers, relays moduals fuses) Many of these facilities contain LED indicator. In the tests, I took photos of the products and then used the Boolean flags to replicate the LED on the PC so that the test operators can check to make sure the equpiment LED turns on as needed. My problem is that many products contain 20 + LED and have no order to how they are turned on. Because of this that I eventually do a boolean for each LED indicator, put all the indicators in a structure of disabled, then using local Variables at each step to display on the FP LED should now be on. It's often a lot of locals throughout the program.

  I tried to make a very basic sample of VI to try to show what is a normal procedure. How can I reduce the amount of local Variables without increasing the complexity of my VI?

  If the LED change of State within the meaning of the criterion - within the case statement - you need a parallel loop.

  I did a heap of your LED and does an architecture of producer/consumer of your case, 'Test 2' attached.

  Edit: In my table, on the bottom line, the text should read "your 6 LEDS are now a Cluster" rather than "your 6 are LED not a Cluster."

• copy a local variable without front double element

  whenever I have copy and paste a local variable in the block diagram, LV automatically duplicate the front panel which is really awkward... is there anyway to stop the duplication of the façade?  I have look all over the place, but maybe I missed something... .Gee where that parameter could be?

  There are two ways to copy objects in LabVIEW. Of course, we're the regular copy and paste. You can also hold down the Ctrl key and click on and drag any element in LabVIEW to create a copy. It is not only faster, but this copy mechanism can be used for local Variables and related nodes of property without too much a copy of the associated control. Check it out!

• 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".

• LabVIEW: Concerns with local Variables and the readability of the program

  Hello everyone. I was hired for the summer to work at my University to a new laboratory. All right, but I have some problems with my main VI. I am a new user of labview coming from a C++ background. I went through several iterations of adding features, fixing bugs and doing my readable program. Before the last "cleaning" my program was so big that I couldn't see it all at once on my screen. My goal was to solve this problem. My solution contained three parts: use a state machine show parts of my code at the same time, to remove the son as much as possible, and use structures element to position my code manually.

  I met since problems write other programs that brought me here, and I saw a series of messages condemning the new programmers for their use of local variables instead of cables. I do not know my use of structures element as fancy boxes I can exclude the automatic cleaning is also a terrible practice.

  After doing some more reasearch on the subject I see local variables to add the duplicate in memory entries and their suppression can significantly speed up execution time. I have a delay programmed in a part of my code, but the rest can run as fast as he can as far as I'm concerned.

  I have attached my main program. Looking at it I think I did a good job to make it readable. But I'm not a user expert labVIEW.

  How to balance (do not use local variables, these structures element, etc.) efficiency and readability. Before you make these changes, there was so many things and so many threads all over the place that I couldn't even tell what was going on, and even less my teacher. I really wish I could see my entire program without scrolling on this computer of the laboratory (resolution 1280 x 1024).

  Advice on how I can achieve the efficiency, simplicity and common readability would be greatly appreciated. I feel I've done the latter while sacrificing the first two. Ultimately the three should probably be equally important.

  Thank you.

  Nukem

  LabVIEW 2010

  

  As said altenbach, attach your event structures.  It should really be only need structure of an event, especially for a simple VI like that (I counted 3).  This is the second time I have recommended this today, but fetch JKI State Machine.  I use as the basis for most of my interfaces.

  Here's a way to manage the break with JKI.

  

  

  

• In collaboration with a no engine in the types of different scheme (local variables).

  The program below is used to control a motor with the NI 9401. However, it has been designed to work in two ways, when you push the buttom "adelante" or "ago" he turns in one direction or another, but if you press 'Start' it begin to move in a particular way (which I mentioned) and if you press again the same ('Start'), we need to stop (this way you can push the door "adelante" or "ago" If you want to). The problem I have is with the "local variables", because when the 'Start' button is the I three while loop and I Don t know how said it stops when the 'Start' button has been pushed and the same when the 'Start' button is pushed, and I press the 'Start' button to stop it. I have a mess with the function of local variables.

  I know it's a little complicated to understand by Word, I tried to explain more clearly.  I hope you can help me.

  Hello matt198717,

  Yes, I think that the problem was trying to use local variables in parallel loops. I use this property at the time of the node and it works!.

• 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.

• automatic creation of local variables

  Hello

  I have the impression that the idea I have is probably not possible, but I thought it wouldn't hurt to ask.  I connect CAN data using a cRIO and NI 9853 using the framework on the channel of convertion vi.  I have a selector of cases in which the message id dictates the case.  In each case, the raster data are converted and sent to tables for data and the name of the channel.  Then, in a separate loop, I make every tenth iteration in the name of channel and data with local variables and save it to a file of PDM.  I currently use local variables for each table in the selector of the case.  While this works well, I'm trying to simplify it and make it like if someone wanted to add several CAN signals for forest exploitation and so more cases in the selector of the case, they could do with as little work as possible.  In essence, I need to make fake evidence.  The idea that I'm trying to find a way to create a local variable and a specific reference indicator as soon as a case is created automatically.  Is it possible, or I ask much of labview?  Thank you.

  
  

• update of local variables

  I want to acess the value of a variable outside a befor even loop the loop is completed, so I am trying to create a local variable and use it to transfer data outside the loop to do simultaneous online processing.

  However, I am only able to update a flag outside of the loop with the variable name put to day... but if I pull a wire from there to do a treatment of value in the thread is not updated...

  I tried both versions and update the same... only one digital indicator is updated... numeric2 isn't always updated... Why?

  How can it be resolved?

  During the iteration of the inner loop of the outer loop will not update. See an example of a quick fix LV 8.6.1. Try not to use local variables unless absoulutely necessary.

• Why LabVIEW example projects using Global Variables?

  I'm puzzled.  I've been pretty good programmers LabVIEW talks (including some who work for the OR) and came away with the impression that Global Variables should, as a general rule, be avoided, with functional Global Variables (alias VI Globals) generally preferred for "local memory".

  I have studied some of the example distributed with LabVIEW, 2012 and 2013, in particular the proposed acquisition in real time and am struck by the use of Global Variables, where I'd be inclined to use instead a FGV.  For examples, to stop all the loops on the RT target, the overall "All the RT loop Stop" is defined; 'Constants' of configuration (such as timeouts, Streme network names, the names of the journal folder) are kept as Globals; Streme network endpoints are stored in Globals.

  [Note - there is a weird spelling of the second word of the network Streme, above - when I tried to post with the correct spelling, I got an error message saying this word is 'not allowed in this community".]  I apologize for the offense, but I must confess that I do not understand what the problem with the help of the spelling of this word...]

  Why use Globals in these cases, rather than write a bunch of VIGs to hold these data?  Note that almost all these Globals are 'Read' essentially (written once when a resource is acquired, for example) or "Read Only" (treated as if they were a constant).  Indeed, read-only variables can be written as a Subvi with only an output terminal, acting as a (visible, due to the icon) constant.

  I can see advantages to this approach.  On the one hand, VIGs can have error bounds who run the data flow (I just spotted a bug "data flow" in code, I am developing that is based on this model, to read configuration data to an XML file in a world and in the same VI, Global wiring to a "use - me" terminal, but with no guarantee that I'll read the overall after I write it).

  It is, I suppose, a matter of 'speed' - perhaps Global Variables are 'faster' than VIGs (especially if the VIG 'sits' on an error line).  My thought, however, is that this difference is likely to be trivial, especially as these VIGs (or Globals) tend to become "occasional" calls (with the exception of the indicator 'all the loop Stop' which is called once per line).

  Are there other arguments or considerations that make a Variable global to a better choice than a VIG?  Is there a reason that LabVIEW developers put in these start-up of projects LabVIEW?

  BS

  I have to ask, how do you use functional Global Variables?  Like just a Get and Set?  If so, you can use a global variable.

  Yes, globals are faster and use much less overhead.  At the summits of CLA in recent years, we talked about using globals.  The most common use is for Write-Once-Read Many and writing-never-Read Many with configuration data.  It's a good idea to use globals with the constants that can change on you.  It turns out that the world will have the same performance as a constant in this case.  This is done so that you don't have 1 place to edit the 'constant '.

  The rule on "Globals are evil" actually goes back several years when NEITHER had the huge "people of the country are bad" vendata.  But NEITHER explains well how to do things properly.  So I found people, instead of using local variables, using the value property node.  It's even worse because the property causes thread swaps and kills your performance.  It wasn't until I shouted to people to use wires and shift registers I have seen improvements in the way in which people wrote their code.  So people are always riffling in the use of globals and decided to use FGVs with the EEG and fixed rather cases.  But this does not solve the problem of the conditions of race with critical data and you cause an additional burden.

  So from my experience, I use globals all the time for configuration data.  Yes, you must be careful about the race conditions.  But as long as you understand that it is a common and useful practice.

  I would not use a global variable for data that are constantly changing (use registers to offset or Action motor) and/or processes that have critical sections of code (use a motor of Action).

  NOTE: I use the definition of Mercer to FGV (a Get/Set only) and motor Action (many cases which specifically affect the data).

• How to find measures that use a given local variable?

  I have a variable in my sequence TestStand, called Locals.x, and I want to find all the sequence steps that refer to him. I thought I might be able to right click on the variable in the 'variables' pane and use something like "find the steps using this variable.

  So far, the only one that works is to rename the variable (such as Locals.x_), and then click the Analyze button to reveal errors that result. It is a clumsy method, however.

  Any other ideas?

  What is the problem with the help of the TestStand find/replace tool?  Just press CTRL + f and type Locals.x in there.  Then click find/replace.  You will get a list of all the places he used.

• Use of global variable from local variables for business rules

  Someone at - it guidelines on the use of overall compared to the local variables for the business rules? I really don't like the world no matter what, so if someone has a compelling reason to use overall.
  
  If I use a local variable in the world, is there a single character required for the local variable or no problem with the help of the same name local var in all of business rules.
  
  Thank you

  Hello

  I bet you have a background in programming. Don't let the 'global' nomenclature lure you into thinking that "bad design - not encapsulated, etc" with regard to business rules. According to John, this area, variable overall are a vehicle to reduce maintenance.

  For example if you have a variable in which all its used BR called CurrMonth and its always the current month, it create once, maintain his assignment in one place and use it anywhere. In this case 'global' is in fact less.

  Kind regards
  Robb Salzmann