Implement a graph data Structure

First time posting here, I was introduced to LabVIEW while participating in the FIRST.

I was reading on The graph data Structuresand wanted to see if I could use them in LabVIEW, because it looked like a good way to convey information. Unfortunately, it seems that the right lane until I tried will not work. I tried to create a typedef that consisted of a group of two elements, an array of linked nodes and an array of edge weights. Unfortunately, I found that you can not have recursive types, under the related nodes in the typedef table should be the same as the typedef. I know not why it's after a bit of searching, but I was wondering if there was a way around this problem. From my research, it seems like using a class root and a child class is a way possible, but advance to do.

I currently think of all representing nodes associated to a knot like an array of clues that you can use to get the chart referenced nodes. This means that the chart cannot be sorted or otherwise modified so that index numbers does not work, you can add objects to the end. Is this just thought, or there at - it another way to go about this?

Not an easy problem, as the recurrence is not native to LV programming (much less any other language I've used except assembler).

But the solution to your problem of index number is to use the 'key '. Each node must have a unique key (number), so that you can address it (search key) even if the table is sorted in some way.

Again, it is not native to LV this means you will have to program the logic of other languages use this yourself (Pseudo-pointeurs, handles, keys, hashes).

A practical side: I would not implement the graph by BT himself but access a graph from another source (database?) via an interface (ActiveX, .NET). To learn a little more on how to do this, try to play around with the tree control (this is a limited graph).

Felix

Tags: NI Software

Similar Questions

  • How to import photos from iPhoto to the Photos without losing the date structure

    Hey there,

    Today, I realized that not all my photos to the Macintosh iPhotos Photos last year. At this point, I'm missing about 700 photos.

    Is it possible to merge the iPhoto to the existing photo library library while keeping the structure of date? I tried just to drag some photos but they then imported as if they were taken today.

    If possible, I want to keep the date structure so that all the photos that were taken at the same time will remain together.

    Export images from iPhoto to the Finder, and then import them to Photos.

    File-> edit

    This trick of the user

    https://discussions.Apple.com/docs/doc-4921

    a details of the options in the export dialog.

    Ignore the file date.

    There are two types of metadata involved considering the jpeg or other image file.

    One is the data file. That's what shows the Finder. That tells you nothing about the content of the file, just the file itself.

    The problem with the metadata file is that it is easy to change the file is moved from one place to another or exported, by electronic mail, downloaded, etc.

    Photographs have also obtained the Exif and IPTC metadata. The date and time that your camera broken that the photo is saved in the Exif metadata. Without worrying if that said the date of the file, this is the actual time recorded by the camera.

    Applications of photo like iPhoto, Aperture, Lightroom, Picasa, Photoshop etc. get their date and time of the Exif metadata.

    When you export from iPhoto to the new Finder file is created containing your Photo (and its Exif). The file date is reported - exactly - the date of export.

    However, does not change the Date of the Photo.

    The problem is that the Finder doesn't work with Exif.

    Thus, your photo has the correct date and the file does, but these are different things. To perform a sort on the date of the Photo, you will need to use a photo app.

  • LabVIEW: Memory data structure or corrupted.

    Hi all

    I know, this is a very simple question, but I couldn't solve it. When I entered a text in hexadecimal control box. I would like this text to be converted to hexadecimal number. I use unflatten string function.

    If I get 8 characters, it does cause some errors. For ex: 1234 5678.

    But if I go, for example, 1234, it causes the following error:

    LabVIEW: Memory data structure or corrupted.

    How can I solve this problem? Thank you and best regards,


  • Corrupted memory or data structure

    I have a .NET application in which to try to determine the VI in a llb file. This is the code:

    LabVIEW.Application lv = new LabVIEW.ApplicationClass ();

    LabVIEW.Library lib is lv. OpenLibrary (@"C:\Program NIUninstaller Instruments\LabVIEW 8.5\examples\general\strings.llb");

    I get the error message: LabVIEW: corrupt memory or data structure.

    The LabVIEW.Application reference is correct because the loading and normal execution screw works very well.

    What could be the problem?

    "There so no way to open a file of Bachelor of law in using the COM interface?"

    See my post of 2009-06-24 03:29.

    Or create a dll to LV who calls "Directory list" and returns a list of the screws. Bind as tou your application dll.

  • cwimaq vs imaqdx image data structure

    I'm using VB.net (2005) in a simple firewire camera snap and save the application.  I used before CWIMAQ com objects in VB6 without problem (using the WriteImage function).  I made a vast machine vision work in VB6 with the CWIMAQ, so I know that those tools, my trouble is now I'm trying to port to VB.net.

    Currently I can not examples of dotnet component image snap-in to work with the CWIMAQ objects in dotnet.  I tried the examples included with the NI Vision acquisition tools and have had success with the c# examples for imaqdx, not CWIMAQ. The port inherited examples from VB6 to .net, however, there are some usability issues with the structure of COM I'm not smart enough to defeat in .net.

    Here's my problem, and maybe there is a simple solution.  I need to save the image and cannot for the life of find me the imaqdx method that was similar to the cwimaq.writeimage function.  I have the snap-snap-imaqdx working in vb.net, I tried to use the CWIMAQ.writeimage, but of course, I get an error of "implicit conversion" between the CWIMAQ and the data structures imaqdx image. I can get the imaqdx.image as image system.forms.drawing?

    Y at - it an easy way to save an image using the tools of imaqdx in VB.net-similar to the way in which we used CWIMAQ. WriteImage?  Can someone point me to an example or a net which shows?

    Thank you

    James

    Hi James,

    The write functions are methods of the image of the Vision. For example, to save the image in png, you would call

    imageViewer1.Image.WritePngFile

    Our examples of languages of text can be accessed from the Start Menu (programs > National Instruments > Vision > text basic example)

    Hope this helps,

    -Christophe

  • File system data Structure of the ReFS in the context of a legal analysis?

    Hello

    Explain the file system data Structure of ReFS in the context of the legal analysis?

    Concerning

    Hello

    Your question is beyond the scope of this community.

    But I see you have already posted this Question on TechNet.

    https://social.technet.Microsoft.com/forums/en-us/a706b829-3d60-478b-ADBE-a974cbe3e67f/detailed-data-structure-of-refs-file-system-in-context-of-forensic-analysis?Forum=w8itprogeneral

    See you soon.

  • What is the best way to move the data from the app and Server data structures?

    Hi guys,.

    I developed my application locally with Apex 4.2 and Oracle 11 g XE on Windows 7. Not far away, it is time to move the application to a server Oracle Apex. I guess that Exim is the way to go app. But what about the APA tables and data (tables/as 'customer' and 'account' created specially for the application)? I've been using a modeling tool, so I can run a DDL script to create the database server data structures. What is the best way to move the application data on the server? Is it possible to move the structures and data in a single process?

    Thank you
    Kim

    There is probably another way to get here, but in Developer SQL, on the navigation tree, expand objects until your table, right-click, and then click EXPORT... you will see all the options. It is a tedious process and it sucks IMO, but yes, it works. This is zero especially because 1) it's a table at a time, 2) If your data model is robust and has constraints and sequences and triggers, then you will need to disable all for the insert and we hope you can re-enable constraints, etc. without hitch (good luck, unless you have only a handful of tables)

    I prefer to use the oracle EXP command-line to export an entire schema, then the server target, I use IMP to import the schema. In this way, it is almost true. This makes the dirty life if you develop multiple applications in a single schema, and I felt pain - however - it is much easier to drop the tables and other objects is to create them! (thus, even if the process of EXP/IMP moved more than you wanted to "move".. blow everything you don't want on the target after the fact...)

    You can use method datapump oracle too.

    If not, what can be done, IF you have access to both servers of your instance of SQL developer (or if you can tnsping both already from the command line, you can use SQL * MORE), is to run a script that will identify the objects of your applications apex (usually by the prefix for the names of objects, such as % EBA_PROJ_ etc.) and do all the manual work for you. I've created a script that does just that so that I can pass data from dev to prod servers on a dblink. It is difficult because of the order that must be executed to disable constraints and then turn it back on and of course, more complicated if don't always precede you ALL your "objects demand '... (tables, views, triggers, sequences, functions, procs, indexes, etc.)

  • Form of the ADF for data structure with several child records

    Jdev version: 11.1.1.2.0

    I have a data structure with a one-to-many parent-child relationship. I give an example of the data structure.

    Employee table:
    ----------------------
    EmpId
    EmpName
    Salary

    Table Historiqueemploye:
    -------------------------------
    EmpId
    Previous_Employer
    From_Date
    To_Date


    In the ADF form for entering data for a new employee, I want to give a layout (say, a button "Add row") for the history of the employee's employment. How can we succeed in ADF?

    I'm new to ADF. Would be grateful if someone can help me with detailed steps or a link showing such a demonstration.

    Thanks in advance.

    Hello

    If you exposed a View for the Historiqueemploye table object, then simply drag this point of view as a form and then drag and drop the create operation (within the structure of the View object in the data control palette) as a button for the new line is created. If you do not always display the historical, add it to an af:popup and start button context menu create or hide the af: panelFormLayt that a form is added by default.

    Frank

  • a data structure to represent a table in ram?

    So I put in place a basket using a table in the database and it is fine.

    BUT, I think that the table approach is not only effective - for example by clicking Add to cart does two things:

    (1) Insert the row into the table shoppingCart

    (2) view all of your basket for this session

    I think, wouldn't it be nice if I could simply store the basket in a data structure? I do not know that ColdFusion supports such an accession with addRow, removeRow orders - I just can't think of it.

    Don't you think that it is an effective approach?

    I read the question as not updating the database for every request.  But rather to keep the shopping cart in memory information while the user has been adding, deleting, juggle it.  Thus only pledging to database storage standing at the end.

  • data structures

    Can anyone recommend a good page giving an overview of AS3 data structures?

    Take a look in help, on the basis of programming with ActionScript 3.0 "ActionScript language and syntax", there is a section on data types. Suite "ActionScript language and syntax, there are some relevant articles on dates, strings, arrays etc. page descriptions of data types covers primitive data types and references defined in base classes ActionScript complex data types.

  • How the graph data are resampled pixels?

    A test, I created two identical graphs with land areas 500 pixels wide and a noisy sinusoidal signal of 1000 samples.  A chart displays the waveform right, while the other got the results of the use of the function Arrray to decimate to halve the number of samples.  They are not the same.

    Up to a waveform graph does exactly when it displays a data value larger than its width in pixels?

    As you have noticed, the graph is a little more intelligent that you expected.  When the number of points exceeds the number of pixels, a form any resampling must take place.  A simple decimation as you tried would eventually pass some interesting points.  Instead, the outliers receive priority when selecting which points to display.  Strong in this way, peaks and dips appear even on a large scale.  Reproduce this behavior yourself can be tricky.  And once you reduce the data set, the points are gone and zoom is not as effective.

    Usually, I try to let the chart to do as much as possible.  A simple and effective way to reduce the size of the data you have to ship on the network is to use the SGL precision instead of double precision.

  • Mixed signal graph - data digital unable to see on the graph

    Hello

    I'm tracing analog and digital data on the graph of mixed signals. I'm not able to see numbers on the graph, but when I export data to excel it shows all digital plots also. According to me, Miss me some settings.

    Please check attached VI for reference and let me know if anyone knows the solution

    Kind regards

    Jaysha

    I changed the frequency of sampling to '1 '.

  • How to use network variables to transfer data structure C?

    I found a CNVStruct in CNVDataType.

    When calling "CNVCreateScalarDataValue" I always get a message error "the data type is incorrect.

    typedef struct TestType_t {}
    float2 int [2];
    unsigned char Data [16];
    } TestType.

    TestType TestData = {{1,2}, "23456"};

    CNVCreateScalarDataValue (data, CNVStruct, & TestData);

    Network Variable only does support the primitive data types?

    Can I transfer data on the C structure?

    Hey Vincent.

    You can send some types of structure, but must be in place.  Because your structure contains arrays, you have a building yet more to do.  It should look like this:

  • XY graph, data collection

    Hello

    I'm trying to collect a XY Chart data, to more effect in my program.

    But when the graph gets no information more clearly it seems its Charter.

    I use this vi as a Subvi if it's any help, which is why I use loop so forget that one.

    Or is there anyway to collect data from it and I just have to save it in a 2D array?

    Koen


  • How to change the accuracy of output waveform and spreadsheet graph data acquisition

    See attached vi, data acquisition connects to a waveform graph in a spreadsheet. I want to change the precision of the output of Wizard DAQ 6 decimal places with 2 decimals, but everywhere I looked on the DAQ assistant, I can't find a control accuracy. I missed something? What is the elegant way to do this?

    Thank you.

    Hello sunflower.

    This seems related to this question...

    Why do you want to change the output of the DAQ assistant?

    Should not change the precision of the creation of the worksheet? To do, simply give a few parameters for the functions "to the string conversion..."

    Outside the file save all the other screen precision parameters are just cosmetic measures!

Maybe you are looking for