Enter and exit a case structure

I'm currently building a control. I have a condition for three booleans to become true to enter a case structure as true. One of the conditions is a temporary increase in temperature. I want to stay in the case structure after the temperature becomes false but both of the other booleans stay true. Is there a way to do this or should I be using some other technique?
Thanks,
Colt

I think this guy is running into the same misconception I and many of my classmates ran into about LabVIEW back in the day. When your code enters the True Case, it will complete the True Case and immediately exit the True Case to complete whatever other tasks that may be outside of the Case Structure (assuming it didn't already do them). Then, the while loop (you must have a while loop) will move on to the next iteration, meaning it will do it all over again.
Now, if you know already know and understand how code works in general (about iterations) then do forgive me. I've edited a lot of student code and have seen this very mistake. A misunderstanding of the fact that code reiterates and will do it all over again if not told to do something else. Typically the mistake is made with Event Structures. I know it doesn't make much sense to not understand that...but trust me, it makes sense to those who don't understand. ha

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Thanks for the reply Brian,
I don't get a JITInlining callback for Monitor.Exit (however I do for some Monitor.Enter calls). For FunctionTailcall3WithInfo, I also don't get a callback for Monitor.Exit (but I do for some Monitor.Enter calls).
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How do I delay 1 of many outputs exiting a case structure?

I have a system here which is sort of a finite state machine, using digital I/O, I am monitoring a series of digital inputs which in turn form a binary number which is the input to a case structure. Depending on the binary string (number) that is read by the case structure, a particular series of boolean constants (T or F) exit through the case structure which are then used as my digital outputs (in my case they are controlling a series of relays). Basically, I have a condition where I would like one of the relays to be time delayed when switching in one direction, but not in the other. The problem is that when I do delay this bit, it also delays all of the bits coming from the case structure.
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Well, I can't think of a really easy way. You could generate a delayed pulse on a counter output, instead of using a digital line. Otherwise you will need to keep track of the delay time in your loop somehow. The timing is only going to be as accurate (deterministic) as your loop rate, and will be operating system dependant. You may have some jitter. Attached is an example of a software delayed boolean indicator. Download both VIs.
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Attachments:
delayed_relay.vi ‏30 KB
boolean_trigger.vi ‏14 KB

Using addEventListener for Enter and Exit frame

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kglad wrote:
// in frame 1:
function f():void{
trace("function f is executing when the playhead is in frame:", this.currentFrame);
// in frame 2:
f();
This works well For Excute Function on entering Frame Once !! thanks ...
but Only 1 More Question :
as You told me in your No.2 Replay :
I try to add some movieclip with instance name Or FLv playback with instance name and then Try to use this codes :
mymc.addEventListener(Event.ADDED_TO_STAGE, addedF);
function addedF(e:Event):void{
trace("I Start");
mymc.addEventListener(Event.REMOVED_FROM_STAGE, removedF);
function removedF(e:Event):void{
trace("I exit");
why The removedF function Works well and the addedF function not work ?!?   in fact nothing Happend on Enter This Frame but on exit i see my I exit Trace !!

Loading a video/image on entering and exiting a marker

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Can Video widgets start and stop when entering and exiting the browser viewport?

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My iPhone is constantly entering and exiting the load-up screen

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Iphone 6 on iOS 8 is freezing and lagging occasionally esp when entering and exiting the Facebook app?

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Cluster value lost when leaving case structure

Hello all,
I am having an issue with a particular VI I am working on. (FYI this is in Labview 8.0)
The VI is set up to run a current source, voltmeter, and thermometer and then record and graph data in various ways that are selectable by the user.
Everything seems to be working fine except one particular graphing method. When I try to graph Current vs. Voltage, the current value is gettiing lost. Within a case structure the current and voltage are combined into a cluster and then exit the case structre to be later appended to a cluster array.
However, the value of the cluster is being lost when the graph is set for Current vs. Voltage. Any other method and it is working properly.
I can't seem to figure out why this is happening as it does not make much sense that the other methods of graphing work but this one doesn't when it is coded the exact same other than having different variables.
I have attached the VI with added indicators showing that the cluster value is being lost once it exits the case structure. Any help would be much appreciated.
Thank you very much and I apologize for my extremely messy VI.
- Nathan Cernetic
Solved!
Go to Solution.
Attachments:
IV-RT.vi ‏185 KB

You really need to boil this down to something we can run and reproduce the issue.
Have you tried to break a few relevant connections and rewire? Maybe something is corrupt.
Beside being a mess, your VI has quite a few glaring mistakes.
Let's have a look at the structures in the upper right:
90% of the code is the same in all three case structures, so all that needs to be inside the case structure is the small part where you built the 2D array. Everything else belongs outside the case.
The sequence structure has no useful function.
Why do you need to reverse the array with each iteration of the small FOR loop? Once before the loop would be enough. Right?
Why do you use built array inside the small FOR loop, but don't autoindex at the loop boundary? All you ever get is an array with exactly one element, no matter how much the loop runs. Seems useless! (see below image for an alternative).
You would not even need to reverse if you would use "built array" instead of "insert into array at position 0" in the central part.
Others: You constantly hammer all your property nodes. The only need to be called when things change. Again, you have way too many instances. For example in the case structure where you are having problems, the same property nodes exist in all cases. A single instance of the property node belong outside the case and only the string constants inside each case. Whenever code is the same in all cases of a case structure, that code belongs outside!
Message Edited by altenbach on 06-19-2009 03:39 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
RubeLoopII.png ‏10 KB

Ipod nano resets when I click on music, and exit podcasts.

As the subject say's, on my 4GB black, ipod nano when I click on the music tab it resets, bringing up the apple logo and goes back to the main menu. Same thing happens when I exit the podcasts menu, I can listen to a podcast but when I exit podcasts and go back to the main menu it resets bringing up the apple logo again and going back to the main menu. I can do every thing else view Photos go into the Extras tab, Settings and even Shuffle Songs which play fine. I can enter and exit these with no problems. When I plug it in to my computer it's fine even in itunes it's fine I can play anything and do anything. I did a restore of the software already and it fixed nothing, I’m all out of ideas.
Please help thanks.
CoH
4GB ipod nano Windows XP

I think I figured it out. Podcasts are the culprit, if you set up you your iPod nano to automatically update podcasts and it downloads them on to the iPod, it causes an error in the iPods software, causing it to restart when you click on music or leave the podcast menus. So I changed the settings to manually update podcasts. Putting my podcasts manually onto the iPod, they show up in the Podcasts playlist under my iPod nano menu (which shows automatically) in iTunes. This is when the error starts, when I undock my iPod nano and go to music sure-enough it restarts, I plugged it back into my computer and deleted the podcasts, undocked it and it was working fine. I converted the podcasts to AAC and then put them on the iPod. They did not show in the Podcasts playlist, they just show as normal songs, and when I undock it it works fine. Now I know that they don’t have to go into that playlist and that I can create my own smart-playlist. But it should not do something like this. I’ll make a new thread about this problem.
Thank you all for the help.
CoH

In the attached VI I dont understand why data from the inner case structures are not being transmitted to the array.

In the attached VI I don't understand why data from the inner case structures are not being transmitted to the array.
Thank you.
Solved!
Go to Solution.
Attachments:
TEMP.vi ‏25 KB

It took me some time to figure what you are trying to do but I think I have it now.
The SR is still required.
What is happening is your "Bundle By Name" is replacing all of the fields of the cluster, not just the value coming out of the case structure. So to maintain the cluster stuff you do in earlier iterations you can either...
1) Put the "Index array, Bundle by name, and Replace array" inside the case structure and ONLY bundle the value you are setting in that iteration. (as you will see Tim post shortly)
OR
2) Move the Index array before the Case, unbundle all of the fields and feed teh case structure and run them across the case so that ALL of your output tunnels come from the coresponding input tunnel EXCEPT for the filed you are trying to set.
Ben
Message Edited by Ben on 05-05-2010 01:31 PM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How do I get a case structure's panel?

I am trying to place a boolean indicator within a case structure via LabVIEW scripting and am not having any luck.
I started with the following source code, which creates and populates a case structure from an array:
https://decibel.ni.com/content/docs/DOC-22703
So my code, rather than put an enum inside each case, creates some compound arithmetic and a mask for each case. This is all working fine. I now want to place boolean indicators on the front panel that correspond to each case, and this is where my problem is. I can create the indicators, but when I look at the block diagram view, all of the indicators are located outside of the case structure, rather than the indicators being inside of each respective case.
I think the reason is that a boolean indicator is created by passing a reference to the front panel. But the problem with this is that the VI panel reference does not indicate that the boolean should be placed inside the case structure, just on the panel, so when you view in block diagram mode, it's just thrown the indicators all outside the case structure and wired them up via tunnels. I am getting the panel reference by accessing the OwningVI field of my CaseSel object. I feel like there must be some field I should be able to access that indicates to put the block-diagram boolean inside of the respective case structure, but I can't find it.
I've attached a file with 3 pics in it. One shows a pic of the code I'm using to create the indicators. One shows the type of output I'm looking for. One shows the type of output I'm getting.
Solved!
Go to Solution.
Attachments:
lv_case_struct.jpg ‏221 KB

Before you connect the wire to the terminal, call the Move method on the indicator's terminal and use one of the case structure's Diagrams[] as the owner. This will move the terminal into the structure.
Try to take over the world!

Event structure vs case structure?

I am developing an application that is fairly user input based... lots of boolean control buttons to do different things.
In the past, I have avoided "value change" event structures, and instead went with a while loop, stacked sequence, and series of case structures. After having done it, I decided this was a terrible idea. This time, I intend to build an array from the booleans, convert it to a number, and feed it in to a single case structure. This will give me the option to add cases for different combinations of the booleans being pressed.
I guess the question is: What is the best method for doing something like this? Does one have advantages over the other?
Edit: I wasn't that clear. I would like a comparison between the "value change" event structure method, and just feeding everything in to an array -> case structure. I also am worried that with the bool array -> case structure that I will run in to problems where I end up with too many control variables, and the value of the resulting number gets ugly very quickly. The application has several buttons... next, last, save, load, several different configure setup buttons etc.
Thanks!
Solved!
Go to Solution.

Aalenox wrote:
I am developing an application that is fairly user input based... lots of boolean control buttons to do different things.
In the past, I have avoided "value change" event structures, and instead went with a while loop, stacked sequence, and series of case structures. After having done it, I decided this was a terrible idea. This time, I intend to build an array from the booleans, convert it to a number, and feed it in to a single case structure. This will give me the option to add cases for different combinations of the booleans being pressed.
I guess the question is: What is the best method for doing something like this? Does one have advantages over the other?
Edit: I wasn't that clear. I would like a comparison between the "value change" event structure method, and just feeding everything in to an array -> case structure. I also am worried that with the bool array -> case structure that I will run in to problems where I end up with too many control variables, and the value of the resulting number gets ugly very quickly. The application has several buttons... next, last, save, load, several different configure setup buttons etc.
Thanks!
Event structure. Among other things, it will allow your loop to "sleep." then wake up when an event happens. With a case structure it's going to be constantly polling. Event structure is pretty much always the right way to go in newer versions of LabVIEW that have it available. I assure you, your first solution was aboslutely wrong and you noticed that, your second is better and was common the way before event structures existed, now that event structures exist, you should go with those.
CLA, LabVIEW Versions 2010-2013

How to implement Case Structure for multiple inputs to Pic Ring?

So I have a reasonably simple program which I am almost completeed with. Basically the data of an array is read and then is indexed and a new array is created from the indexed data. And then I use Match Pattern to see if elements in the new array match certain words. And if they do then a number value is allocated to a Pic Ring at the end. And depending on the final number value the Pic Ring changes from one pic to another.
However, I have the problem that I will be using multiple Match Pattern functions to compare elements in the final array, but I can't attach multiple Match Patterns and their subsequent logic statements to a single Pic Ring, only one. I've been trying to work this out by implementing a Case Structure or Event Structure. But the Event Structure isn't working and with the Case Structure, it is very messy with multiple True/False Case Structures inside of each other. Anyway, hopefully this all makes some sense. I'm attaching the VI program to this post. Thanks.
Attachments:
ArrayTest2.vi ‏495 KB
ArrayTest2.vi ‏495 KB

Obviously, you can only display one picture. So then the question becomes which picture to show. Therefore, you will have to create some sort of preference of one pattern over another.
I would use a FOR loop so that you can loop through your available patters and their possible results. Use the Conditional Terminal on the FOR loop so that you can stop the loop on the first match. Then you just wire up the selected value for the ring outside of the loop.
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Enter and exit a case structure

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