Mysterious coercion dot

Found in this piece of diagram:
The constant 2 is of type I32, so why is there a coercion dot at the "Inverted" connector of the Compound Arithmetic function?
The interesting thing is that if I uncheck the "Invert", the coercion dot disappears, and if I check it off again:
Gone!
Full Disclosure: I inserted the I32 conversion function before I noticed the remnent coercion dot... And if I undo all these steps, I am unable to reproduce the coercion dot.
Mysteries of LV...

Hi,
I was able to reproduce it by playing a bit with LabView...
Step1 : I use a double and a U 32 as inputsa -> as expected, there is a coercion dot at the inverted input.
Step2 : I "insert" a conversion on the double line (when I deleted it first, I could not reproduce the behaviour... it only worked when I inserted it). The types should now be ok, without coercion dots.
Step3 : I save my VI... The coercion dot disappeared. (Same effect when I clicked on "run")
It seems that when we "insert" the conversion, LabView does not update the coercion dots... however, it is not forgotten, as they are updated as soon as we save or run the VI ...
Aurelie
Attachments:
Step1.PNG ‏3 KB
step2.PNG ‏3 KB
Step3.PNG ‏3 KB

Similar Messages

The same type and red coercion dot

Hi!
A small project is attached to show how red coercion dot appears if you remove"lib type definition.ctl" from library to a virtual folder. It is interesting that this affects only class property nodes. It does not affect class accessors ("setters") and indicators. The same happens if you move "type definition.ctl" from virtual folder to the library.
Picture shows changes in "vi in library.vi" block diagram.
The application works but a peaceful bad feeling remains ...
There are discussions on this NI forum about typdef controls. It seems that using type definitions can cause serious problems if used together with property nodes. What would be suggested in these cases?
Regards,
Ljubo.
Attachments:
type definition and library.zip ‏69 KB

I can't unfortunately look at your code right now, but there are a couple points to be made:
I'm not sure the problem you show is a bug. Moving the control file out of the library and into a virtual folder in the project changes the type definition because it has a different name.
LV does at times show spurious coersion dots, but I have never seen it cause a functional problem - let alone a serious one.
Mike...
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Coercion dots, Typedef. and Property Nodes

Hi,
following problem:
1. I place a simple Control (Button 1) and connect it to an Indicator (Indicator 1) -> OK
2. I place a Button as Typedef. (Button 2) and connect it to an Indicator (Indicator 2) -> Coercion dot on Indicator 2 (I don't see the point of a boolean coercion, but OK)
3. I create a property node for Indicator 1 (Value) and try to connect a constant (right-click>Create>Constant -> the constant is grayed out and the error message is 'type definition not found or contains error'
Details: The master copy for this type definition could not be found or the master copy has errors. You must find and fix the master copy, or right-click this type definition and select Disconnect.
4. I remove Button 2 and repeat step 3 -> the same thing happens
If I connect an existing boolean constant to the property node there is a coercion dot. As a matter of fact for using one Typedef. Control in a VI all other control property nodes suddenly have coercion dots even if I remove the Typedef. control. Does it mean either all controls and indicators better are typedef. or none at all?
Thanks in advance.
P.S.: the problem occurred originally in a VI with much more than two buttons...

benMyer wrote:
Something else: did you realize that the spell-checker for this forum does not know the word 'LabView'?
Because you are spelling it wrong. try LabVIEW instead.
LabVIEW Champion . Do more with less code and in less time .

"Edit Find" coercion dots, Recommended terminals, empty Description, etc

Are there ways to use LV's automated Find capability to look for any of the following items?
Coercion dots
Connector terminals for which connection is "Recomended"
Controls or VIs for which the Description or Tip is blank
Wires that go behind objects
Wires that graphically are shown touching a terminal but that are not logically connected to it
Objects that logically are inside structures like loops and case statements but that graphically are out of view (beyond the graphical edge of the structure)
Dataflow running right to left on a wire
Variables that are written to in zero places or in more than one place
Controls and nodes whose only output terminal is unwired
Unwired Error Out terminals
I'd like to be able to search through a VI and everything inside its heirarchy for the above things - going through and noticing all their occurances could be good for a project. Some of these are pretty clearly programming errors. Some of them are bad practice, or at least the preference to avoid can be a useful strategy or check. Some of these things are perfectly legitimate to use frequently, but glancing at all the occurances of them gives an opportunity to notice otherwise hard to spot errors. AFAIK LabVIEW doesn't allow searching for them, though it would be able to recognize them.
For any of these, is there a way to Find them?

I think that almost all of the items you listed are coverd by the VI Analyzer. It will find and list all of the offenses, let you browse to each case, and produce reports if you would like.
[Set PunMode = True]
It can be customized in the event you think the "out-of-the-box" configuration warrents it being renamed "VI-ANALyzer".
[Set PunMode = Flase]
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

FPGA: are typedef coercion dots bad for efficiency?

Howdy--
Using LV 2011 FPGA, I always get coercion dots when reading or writing to/from FIFO or Memory items typed with a typedef.ctl. Do these indicate some extra use of resources in the compiled code, or are they harmless?
Thanks a bunch all, and have a great day.
--Brad
Solved!
Go to Solution.

bcro wrote:
Awesome. For a minute there I was afraid I'd have to abandon typedefs..a scary prospect when you're as scatter-brained as I am.
Thanks a bunch Taper for the quick reply. Be Well.
Too answer this question yoursefl you could use
Tools >>> Profile "Show Buffer Allocations...
To bring up a toll that will show where the buffers are being created.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Coercion dots using classes in conditional structure

I am trying to create a plugin driver that is LVOOP based. We have certain drivers we do not want to release. Therefore I am attempting to use conditional disable diagram to select which class is available. One of my questions is why do I get coercion dot between these conditional disable cases? If these are part of a project packed library, does the disabled conditional code included as a dependancy?
In the below example the release case the base class is used and in the development case the derived class is used.

What brought me to looking at the coercion dots was once they are visible, building a packed library LabVIEW fails to initialize the builder. This issue is not remedied until the offending class is removed from the project and the project is closed releasing the class from memory. If I move the conditional disable out side the case statement there are no coercion dots. Also switching between conditionals disable cases does not change this coercion. When I go to build the packed library LabVIEW still locks up.
In summary I believe that the build locks up when ever switching between conditional disable cases.

Coercion dot and strict type definition

Hello,
I seem t be having some problems learning how to use strict type defined controls, would someone please help?
Will you please tell me why the coercion dot is on the subVI's?
Will you please tell me how to link the 'CtlsToWLp Cluster' from Main.vi and the 'Clust Refnum' from the WLp2.vi to the same .ctl?
Thanks,

This is a duplicate post, being answered on
http://forums.ni.com/ni/board/message?board.id=170&message.id=191715

Why this coercion dot on array indicator from strict typedef?

Why is there a coercion dot on the second control?
I created a trivial 3 element array of doubles, and created an indicator by right clicking on it in the block diagram. That's the "CreateIndicator" control.
Then I did the same thing to create a second indicator on the same output wire, and from the front panel selected it and customized it to a strict typedef, saved, and applied changes. That's the "CreateIndicatorThenCustomize" control. It has a coercion dot on it, though. Why?
Thanks to anybody who can shed some light on this for me!
Solved!
Go to Solution.
Attachments:
CoercionMystery.vi ‏9 KB
CustomizedStrictTypedef.ctl ‏6 KB

cebailey wrote:
Thanks, Ben!
Seems weird that this would be considered a coercion. Why do they do it this way?
Q1)
What is the falicy? Is it that you should avoid coercion dots because they force copies, and yet in this case there is no copying involved so the avoidance advice is incorrect?
Q2)
Also, different question, why is Customize Control grayed out in the front panel Edit menu, as long as another control customization panel remains open from the previous use?
Q3)
Finally, how did I miss this after all this time? Well, you probably don't know how I missed it. Actually, if you do know, it might be better to leave it unsaid anyway....
Q1 Correct!
Q2 Not being NI R&D I can only speculate that is was an expediant move to shut-down that functionality. It used to be possible to customize part of a control while customizing a control back in about LV 6. They shut it down making it more painful to do the edits within edits (you can save a control in one edit and then use "replace" to select it while editing the first)
Q3 I will leave taht question as an exercise for the reader.
take care,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Mysterious little dot

Earlier today, I was browsing the internet, and I noticed a little white dot on my screen. After trying to wipe it off, I realize that it is not a physical object. Since it doesn't go away when I change webpages, switch apps, etc, I figure it's just a dead pixel. Meh, I say to myself.
But tonight, at some point I press F11 to temporarily hide all windows on screen, and I notice that this little white dot slides off the screen as if it were a window. So I start quitting applications to see which one the dot was rooted in. But after quitting all apps (except Finder, of course) the little dot is still there.
After a little investigation using Grab and Photoshop, I find that it is not just one white pixel, but a 3x3 translucent box with one solid white pixel in the upper left corner.
I saved the screenshots for this forum, then I restarted my MacBook. Fortunately, the little dot went away. But I'm still submitting this post just to see if anyone here has any idea what made the little dot appear or where it came from. It's just plain curiousity at this point.
Thanks
peavster

I just got my macbook pro and have the same problem. The only thing is that I have around 5 little dots showing and I tried clicking on them but that didn't work to make them go away. I got my mac on June 13th 2008 and I will be going back to Apple tomorrow to see what can be done about this. After spending close to $4,000 on this machine, I feel that something needs to be done about it.

Why do I get this coercion dot?

I have a strict typedef switch-when-released bool button value change event, and the newval property goes straight into a select.
Why the coersion dot? I also get it when I wire straight from the control terminal to the select. Pause Button.ctl is in 8.5
=============
XP SP2, LV 8.2
CLAD
Attachments:
Pause Button.ctl ‏5 KB

Norbert I so hope you are wrong, The boolean True value is defined as '>0', so storing any info in the actual data will make all values true.
The typdef info is stored in the data-information about the pointer.
Ton
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Mysterious Red Dot

I did a thank-you card in InDesign; exported to print-ready PDF. Client asked me "what's the red dot for in the pix on person's face"... There was no red dot on the imported PSD file and it doesn't show in the InDesign document either but it definitely shows up in the PDF document; when I view cymk seps of the exported PDF in Acrobat, the 4 colors show no color BUT the red dot shows up like as if on an undefined color layer of its own with no color value defined for it!
When I print to my desktop B&W printer, it does show up too.
Any clues?

What that is is an oval markup, a type of comment (annotation). You might have accidentally created it in Acrobat. It can be safely removed in Acrobat. It would be interesting to see if it somehow automatically added to the PDF if you were to export again from InDesign.

Coercion dot (comportement)

une petite manip toute simple.
le code de départ : 2 constantes I32 sur une fonction " + ".
la manip :
1) je place une conversion DBL sur une des entrées.
Pas de problème, les points de coercition sont corrects.
2) après la conversion en DBL ... je "re-convertis" en I32.
si on ne touche à rien d'autres ... le point de coercition sur l'entrée de la fonction "+" subsiste.
Un d'entre vous pourrait-il tester et éventuellement confirmer ?
merci à tous.

Salut Ouadji,
Chose promise chose due
Tout d’abord petite explication sur ce qu’est le Heap Peek : C'est une fonctionnalité interne de LabVIEW qui permet d'avoir accès à des informations très détaillées sur la façon dont les VIs sont stockées en mémoire. L'utilisation la plus courante est d'identifier et de corriger erreur de type Insane Object.
Pour activer cette fonctionnalité il faut ajouter LVDebugKeys=True (la casse est importante sous MacOS et Linux) dans le LabVIEW.ini. Un redémarrage de LabVIEW est nécessaire pour que le token soit pris en compte. Sur n’importe quel VI il suffit de faire CTRL+SHIFT+D+H pour ouvrir le Heap Peek.
La fenêtre est découpée en 4 parties :
Dans la partie en haut gauche il y a la liste des Heaps en mémoire désignés par un handle, un type et un nom. BDHP: Block Diagram Heap Peek, FPHP: Front Panel Heap Peek et BKUP.
Quand on sélectionne un Heap on obtient la liste des objets dans ce Heap dans la partie en haut à droite. Chaque objet est désigné par un ObjID, une taille et sa classe.
Les objets en rouges sont les objets sélectionnés.
Le bouton F trouve l'objet sélectionné.
Pour ce qui est de rechercher les infos dans le Heap Peek pour la propagation de type je laisse les Aes oui la R&D de NI de s’en charger.
Benjamin R.
R&D Software Development Manager
http://www.fluigent.com/

Safari appends .dot to all .doc files after Word 2008

I am having a weird problem with Safari which may be caused by incompatibilities with Office 2008.
Since upgrading to Office 2008 (and also trashing my entire system then installing Office 2008 for scratch), Safari is having this nasty habit of appending .dot to all .doc downloads.
For example, on the following site, http://www.microsoft.com/downloads/details.aspx?FamilyID=311f4be8-9983-4ab0-9685 -f1bfec1e7d62&displaylang=en if I download "Deploying Vista Step by Step Guide.doc", Safari will save it as "Deploying Vista Step by Step Guide.doc.dot" which is rather unhelpful.
The knowledge base article (http://docs.info.apple.com/article.html?artnum=304155) suggests that the problem is due to web server configuration - but this does not seem to be the case, because it did not happen before I installed Office 2008.
Using the "misfox" preference pane (http://mac.clauss-net.de/misfox/) I think the problem appears to be that the MIME type application/msword is associated with the file extension .dot rather than .doc
Is anyone else encountering the same issue?
(I am running Mac OS X 10.5.1 on a first gen MacBook Pro upgraded to 2GB of RAM)
Thanks to anyone who can help or confirm/deny this weird problem!

After reading up on Uniform Type Identifiers, I think I have a solution - or at least some sort of workaround. This requires editing the Microsoft Word package.
1. Open the Microsoft Word package (Action -> Show Package Contents)
2. Go to Contents and open Info.plist in a plist editor (I used Panic Coda)
3. Remove lines 703-704 where it reads <key>public.mime-type</key><string>application/msword</string>
4. Remove any caches/whatever (I used Onyx) and reboot.
Further details on Step #3:
There are two instances where Microsoft Word defines application/msword. On my copy of Word, it defines it at line 684-685 and line 703. Line 685 refers to the document type .doc while line 703-704 refers to .dot.
Obviously, I want the MIME type application/msword to refer to .doc (and don't really care too much about .dot files).
Before (lines 688-706):
<dict>
<key>UTTypeConformsTo</key>
<string>public.data</string>
<key>UTTypeDescription</key>
<string>Microsoft Word 97 - 2004 template</string>
<key>UTTypeIconFile</key>
<string>W8TN.icns</string>
<key>UTTypeIdentifier</key>
<string>com.microsoft.word.dot</string>
<key>UTTypeTagSpecification</key>
<dict>
<key>com.apple.ostype</key>
<string>W8TN</string>
<key>public.filename-extension</key>
<string>dot</string>
<key>public.mime-type</key>
<string>application/msword</string>
</dict>
</dict>
After:
<dict>
<key>UTTypeConformsTo</key>
<string>public.data</string>
<key>UTTypeDescription</key>
<string>Microsoft Word 97 - 2004 template</string>
<key>UTTypeIconFile</key>
<string>W8TN.icns</string>
<key>UTTypeIdentifier</key>
<string>com.microsoft.word.dot</string>
<key>UTTypeTagSpecification</key>
<dict>
<key>com.apple.ostype</key>
<string>W8TN</string>
<key>public.filename-extension</key>
<string>dot</string>
</dict>
</dict>
Don't know if this will work anywhere else, but it solved my problem and Safari no longer mysteriously adds .dot to my .doc downloads.

Coercion problem when using Shared Variable

I have a curious coercion problem when using Shared Variables. I want to share the state of a State Machine, which is an enum saved as a control (typedef) called TYPE State (see attached). I create a shared variable called State and define it as a Custom Control, using the just-mentioned typedef. So far, so good. I've attached three simple VIs -- the first one, Init State, simply wires a constant to the input of the Shared Variable to initialize it -- the wired constant is, of course, defined by the typedef. However, the Get State and Set State, meant to wire an indicator (for reading the state) or control (for setting it), develop coercion dots when wired into the Shared Variable. Why? How do I get rid of the dot? [I suppose I could abandon my typedef and custom control, but the beauty of typedefs and custom controls is that it "enforces" rules, lets you use enums for clarity, keeps the code "honest", etc. -- I'd hate to give that up just to get rid of a dot!].
On a related note, the code seems to work. This is much too simplistic to do anything, but if you open Set State and Get State, set the state to anything, run it (it immediately stops, of course), then run Get State, you'll see the chosen state appear in the indicator. So it does appear to work. The "error" (coercion dot) may, I suppose, be a "bug" in Labview because it can't figure out the mapping of the (very simple!) Custom Control, but if so, I hope it gets fixed quickly!
Bob Schor
Attachments:
Coercion Problem1.zip ‏38 KB

Hello Bob,
I am also seeing this behavior, I will escalate this question to our LabVIEW developers and post again here no later than next Tuesday, November 27th as National Instruments will be closed for the remainder of this week.
If this issue does turn into a product suggestion, I would suspect the workaround would to live with the coersion dot for the time being.
Enjoy the holiday
Regards,
Erik J.
Applications Engineer
National Instruments

Red Dots on Block Diagram

Hi this is probably a naive question, but what do the red dots where wires meet subvi's mean? They don't show up as errors, but I'm not sure what is wrong with the wiring.
Thanks,
Arthur J.
Attachments:
Example.PNG ‏15 KB

Avoid coercion dots in your own VIs and live with those in NI's motion library.
Modifying NI's library ? Your time and effort will probably be ruined by the next release.
Inserting Type Cast functions ? The code won't be more efficient but on the contrary will need more space (and become more difficult to understand).
I don't know why NI uses different type definitions but they might have a good reason. Please call them and let us know their answer.

Mysterious coercion dot

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