matrix reference typo?

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• Transpose lines / columns entered for Matrix

  Hi all

  Read a few pages on the forums of the community about me little challenge, but come to the conclusion that using the OFFSET would be the way to go, but I'm struggling with the syntax. Maybe, I'm thinking of it (Note: similar to copy paste n + transpose into excel). The idea is to, first, build the frame of the matrix by using the information in table 1 and 2 below, then laster, fill the inter connection of cells with the data of table 2.

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• Boolean reference table

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  Steve

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• performance of matrix

  Hello

  so far, I used the scoring matrix [i] [k] in the 2D table calculations. Now, I came across another notation, which replaces table 2D in a 1 d table and consequently filling the individual items via matrix [I * j + k].

  I wonder if the second approach is more effective? Obviously, dynamic memory allocation is simpler (and probably faster, too) in the case of vector, but what to access the items? Allocation of memory is actually only once, while in large networks, there may be millions of individual item operations...

  Thanks for sharing your expertise!

  Wolfgang

  I think it depends on how you use the matrix.  Locality of reference can be more important than the calculation of pointer.

  The 2D table is stored in the order of row field, then references along the line (through the columns if you want) and in adjacent rows, are fast, with fewer absences from the cache.  Similarly, the 1 d is in linear order, references in the vicinity will be faster, since the neighbouring location is more likely in the cache.

  If access is distributed randomly in general the complete, I suspect that it does not have much if any difference which form matrix that you use, your application will spend more time to transfer data from main memory to the cache it will do the calculations of pointer.

  I set up a 2D and accessed "against the grain" (along columns) and it has been considerably slower than access in the order of row field.  But then I was sequencing through all the matrix elements in all cases (no random access) so that it was important to do things.  And selection of the compiler was important, that the Visual Studio C++ compiler was the best to use.  The Intel C++ compiler would have been better if I had been able to use the vector instructions but linker CVI will not support the 16-byte alignment.

  If you perform operations of full matrix with sequencing through all the elements of the matrix, you have other options for performance.  If your operation can be partitioned in the matrix, you can use multiple threads to simultaneously deal with the different sections of the matrix.

  I assume that when you say the matrix do you mean a table of C of a numeric type, rather than a data structure special CVI supports - come to think of it, CVI does support matrices - but these can be simple C tables under the hood anyway.

• Matrix multiply more slowly on the RT PC?

  I was playing with large matrices and testing speed on my laptop (the code is intended to run on RT).

  The following code tests just directly using the calculation of table matrix multiply function vs.  Unsurprisingly the multiplication of matrix function executed more quickly.  So when I she ran on RT two methods took so long? And matrix multiply takes LONGER on RT than PC?  Is there a windows optimized code under the hood that is not available on RT?

  I was hoping it would be faster because my laptop is several years old and it comes to PXI controller or super duper 8135. I have deployed it as a startup to ensure from the IDE application did not affect synchronization when running on the RT.

  

  I do not trust your point of reference.  You have two processes happening in parallel.  Ruins any type of comparative analysis you can be in the hope of doing.  They occur in series with a timer in the meantime.

• references element-by-element array indexing

  Hello

  I have a simple question. How can I go on a references element-by-element array indexing? For example, when you use a reference to cluster, there is a property node called "controls [of] ' what we spend in a loop for. For a normal array, "enable Indexing" is usually automatically active when you enter a loop for. Why did for an array of references, this is not the case? Thanks for the help.

  Up there, you are working with a reference to a photo table.  Down, you work with a table of references to individual image controls.

  Looks like you do more complicated it must be.

  You can use picture to Pixmap function to get the image data.  And just automatically indexing the images come from the matrix of the images.

  

• Problem of brick wall: clusters, the size of the reference table

  Good morning forums,

  I hit a brick wall with my application and I hope someone can help!

  I have an array of clusters of size for an indeterminate period (the cluster is generic and data contained irrelevant.).

  Entries to the VI are: a reference to the matrix and a Variant that contains the data.

  My problem is that I need to determine the size of these two entries in table and I can't find a way to do it!

  If the table contained a standard data type I can use the class name property to determine the data type and the size of the array returned by the property "select size" to determine the size of the dimension.  With this information, I can throw the variant into the correct data type and use it to determine the size of the array.  If the data is a cluster to the name class simply returns 'cluster' then I'm so not able to determine the size and can't get the Variant.

  I'm not worried about the casting of data (once I've determined the size this bit is childless), I just need determine the size (and preferably number of dimensions) of the array. Is this possible?

  Cheers for any help

  J

  Use 'Variant to data change' variant of an array of variant and take the importance of that.

  

  Ed.

  Opps missed the variable number of condition of dimensions, in this case, you want to "Format Picture" of OpenG as mentioned blawson.

• Given the reference to an order, how can I get size of table programmatically

  If a reference to a command is passed to a sub - vi, how to get the current length of the array in the sub - vi?  I tried two properties: "NumRows", such as documented, with the visible number of rows in the table control.  'IndexVals' contains the index of the array element in the upper left corner of the table control.  There seems to be no method to obtain the length of the current array.  I tried to change the class of the reference to a matrix to regroup before using the property of '[] 'checks... but this has generated a runtime error.  What Miss me?  Thank you.

  
  

• Matrix relay

  Hello everyone

  I am completely new to Labview. My problem is that I'm trying to run a project conceived on relay matrix. When I try to run it, I get a lot of mistakes even after you download all the required files. He asks the files as in the 1st photo. But even after their download, I get errors and warnings as 3rd pic. I tried to download the whole project, but I'm unable to do so. I don't know where I made the mistake. Could help me with this problem please. Thanking you in advance

  Hi Alain,

  the project sotres to explore the paths of the screw and other files (dll, for example) that you use in the project. delete or rename the files on disk causes facing them questions. See this link:

  http://zone.NI.com/reference/en-XX/help/371361K-01/lvconcepts/resolving_project_conflicts/

  Kind regards

  Heinz

• Matrix of null space

  Hello

  I have a question about Equation.vi linear solve.

  Given a system of equations 8 to 9 unknowns, form: AX = Y, A is a matrix known 8 x 9 and X is a vector of 9 x 1 (unknown) and Y = 0. I would like to find space void of this equation system. We have 9 vectors columns each with 8 elements. Columns vectors are dependent lineary so there must be a linear combination of them. So I would like to find the X by solving for the 8 x 9 matrix null space.

  Is the linear equation solving is capable for this purpose?

  Hi D60!

  If you double-click the linear solve Equation.vi and take a look on the block diagram.

  You will see that, depending on the type of your matrix, functions at different riding are used. You can double-click on these features too, to see how it works.

  I think that the best way to get the matrix null space is the function null of the Mathsrcipt node: http://zone.ni.com/reference/en-XX/help/373123C-01/lvtextmath/msfunc_null/

  More information about the Mathscript node: http://www.ni.com/white-paper/7572/en

  Please let me know if my suggestion is useful.

  Best regards

• Merger of reference groups

  Hello

  I have a code with several SubVIs, each with several objects. I would like references to all objects in a single source of group in order to access the properties of the objects through property nodes in another screw. Since I have a group of reference (which is populated by real references as a Subvi run) for each Subvi, I want to merge all of these clusters into one reference. However, when I do that, I lose all the labels on the objects. Is it possible to merge multiple clusters of reference as well as objects of Dungeon labels?

  See attached picture for more information. I just used an example how of dynamic events can be used to trigger events in any of screws (dynamic events are essential for my code). Method A shows the ordinary way to get references from two different reference groups. As you can see, the labels are kept.

  Method B, I try to make things easier and instead of having multiple "ungroup by name", I simply convert the clusters of berries, use a matrix to build function to concatenate all the references in a single table, and convert the table to a cluster. However, by doing this labels are not retained.

  Thank you.

  Dan07

  

  
  

• Solve linear equations - Block tridiagonal matrix

  Hello

  I developed a vi that can be used to solve tridiagonal systems by block of equations by Thomas algorithm. These systems are usually in the finite differences method used to solve equations in partial derivatives.

  For iterations of 1000 times, its time is ~ 500ms. Now, I want to finish the work within 100ms. is possible to improve the performance?

  Thanks, Jong Hyun

  For details of the Thomas algorithm, please see wikipedia Web page, http://en.wikipedia.org/wiki/Thomas_algorithm. Note that it describes how to solve tridiagonal linear equations, but same logic can be applied to block tridiagonal equations.

  * If you use the vi sparse SLE of analysis multi-hearts and Sparse Matrix Toolkit, the elapsed time is 450 ms ~

  LabVIEW basic/full/pro all use Intel MKL library for linear algebra on MS Windows and Linux.  Intel MKL designed to be very fast for large matrices and breaking a problem given out to take advantage of the different levels of cache. Linear algebra calls go through several levels of functions, including size controls, if any, and may allocate memory for the workspace each call, before finally calculate the result.  This overload problem is evident when the matrix is so small (3 x 3).

  I coded matrix-matrix, versions multiply, matrix-vector multiply, and matrix opposite in the case of 3 x 3 explicitly in soil using the structure in place and full indexation (no loops, all scalar operations).  This eliminates the overhead of controls and allows better and placeness.  This brings your reference point down for ~ 70ms on my machine.  Unfortunately this requires significant code changes if you change the block size, but it provides good performance.

  "I think that, if I can save each submatrix conversely in the first round and use several times, then speed will be better."

  I agree.  You should be able to calculate the most sweeping toward the front of the algorithm and simply replace the submatrices changed and still solve before.  This may mean re - organize the variables to have the submatrices updated or modified down to the right of the input matrix.

  -Jim

• reference to cloned VI

  I'm trying to get the reference to cloned VI.

  I have a program that has multiple reentrant calls VI with clone prealocated for each instance. I would like to reset the default values of all the clones that's why I need reference to call the method that reset the values. I see that VI clone has different numbers, for example edge.vi:1 (clone), edge.vi:2 (clone), but can not find the way to get a reference to them.

  Original VI reference does not VI cloned

  Thank you

  Petar

  Dear kaschiyski,

  In my opinion the best way to do that is to store the references at their opening. For example, you can put the references in a matrix or a queue, and then use the method that you want to use.

  You can also use the cnvention name described in this threa: http://forums.ni.com/ni/board/message?board.id=170&message.id=263156&requireLogin=False

  If you have any question how do that please do not hesitate to ask!

  Kind regards

  Marton