Entry of NaN to a subvi

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• iFFT is slow, if an entry is NaN

  Dear users,

  I write a response to a question that bothered me for some time. I work on, why a certain part of my program works slowly. Well, the answer was that the slow part executed an inverse FFT (Fast Fourier Transform) on an entry, which was a picture of NaN. IFFT receives an array of NaN, should orders of magnitude more time to process the data. On my table of 7601 cells, the report of the execution time averaged 0.1ms (to significant aid) of 120ms (using data NaN). I corrected the code with a structure of business as follows:

  

  I write this fact and the question, because I was surprised a lot to this behavior. I know, many functions can quickly and easily process data of NaN. But iFFT.

  See you soon,.

  
  

• Updated entries on day of a Subvi with while loop

  Hi there guys! It's my first serious experience with LabVIEW, so the question may seem trivial to you, but it's not obvious to me how to solve this problem. So I do an installation that integrates a number of flow regulators, a temperature regulator, DAQ, some taps and a mass spectrometer basic tasks. All these must be automated using LabVIEW. I started by doing a VI for each separate task is going very well. Now I need to combine the latter in an experience of master VI, and of course I run into trouble.

  The problem is that I want of course to control this experiences with some selected buttons/dials/what is on the face before of the main VI. However, each of these VI runs a while loop in which fact acquisition of continuous/data communication / whatever. Of course, I want to change settings online. If I just naively tie them at the entrance to the Subvi these will be read only when the Subvi is started, not during each iteration of the while loop.

  I added a very basic example of the problem, so we are all on the same page. The main VI has a button, the State which should update something in the Subvi. However once the Subvi is started it takes control of the execution and the hand-VI seems to be ignored (appears to hang) even if the program has a lot of spare time to read the buttons and put on day of admission. What is the official solution for this kind of problem? My experience in programming that I prefer to keep the intact Subvi, so I can use it as a reusable standard library. Of course a similar question can requested the sub - VI output which will be updated only once the execution is completed (which is never during normal operation).

  PS. I'm using LABView 8.6 on XP

  The best way to set up a BT program must initialize first your settings, and then launch a while loop where you communicate/aquire data or whatever, then after the while loop is finished close and clean up your references.

  Inside the while loop, you can place your code in many of the screws and it is possible to run those in parallel, but I defenetly does not recommend the use of loops in slot face, especially without having to open the front panel or a stop test.

  If your code is completely executed up to your Sub - VI, the main.vi will wait for the sub - Vi ends before continuing the code.

• Parallel Subvi errors

  I'm trying for a program to impliment appropriate error handling data entry.  I have a Subvi, which reads from multiple variables, each of which has its own error and error.  Is it acceptable to wire them in parallel as I showed in the attached picture or should I put them all in the series?  I thought that it looked much cleaner to get all nice and neat, stacked tags but I'm more interested in learning the correct way.

  Thanks in advance.

  Sharing variables that all communicate through the same process, in order to access multiple variables at the same time can cause problems of performance due to a scheduling conflict.  It is best to serialize shared variable calls for better performance.  See the shared use Variabes effectively help topic for more details.

  In general, it is not useful parallelize small code snippets as you, unless there is a specific need for a simultaneous performance.

• Open the Panel before Subvi in the executable

  Hello

  In my labview project the MainVI contains about 20 subVIs. My goal is that by clicking on a button on the Panel before the main VI I would open a special Subvi (assuming it to be sub - VI, 10). To do this in the labview development environment, I used a reference of openVI with its path of entry is the name of the VI vi I want to throw (Subvi 10), and then set a real constant on the front panel to bring up the control panel front of the Subvi. This works well in the labview development environment, but when I create an executable file I'm not able to open my Subvi. I looked around, on the knowledge base and found this article.

  http://digital.ni.com/public.nsf/allkb/24F54CF34391074D862570E6005857DE. But this talk article to launch the front each time the Subvi is called. This does not work in my case, because sometimes the user may not want to launch the Subvi. I also have a lot of controls and indicators on the Subvi, so there is no way I can get that on the main VI as she would not clutter on the main VI.

  In the property settings for the building of the executable under the category of settings of the Source file, I see the option Panel before removing the dependencies, but it does not set the option for the Subvi individually. Only together, I can remove the front panel for all content items.  If no help on how to solve this problem is greatly appreciated.

  Have you tried to use static references VI instead of using 'VI open' with a file path?  With a static reference VI, the compiler has a better idea on what you are trying to accomplish during the execution.

  I did it in before executables without any problem.  Personally, I like having a Boolean input of the Subvi, called "Display window" (or something like that) and then have the Subvi manage how it wants to open (or close) front panel.

  

  It has more than this past... the code snippet a little caught of freedoms.

  It is within the Subvi (which my main VI is still running).  The Subvi has a static reference to himself.  I have a button on the front of my VI main panel when you press on sends a 'true' to Boolean entry "display window.  The Subvi responds by opening the front panel upward. The opposite happens when the button is pressed.

  This code was compiled in many executables and works without any problem.

  Edit: Image cropped.  This Boolean coming is "First Call".  The function retrieves LV 2009 done this 'error 2' terminal.  Laughing out loud.  I wouldn't name which.

• FFT returns NaN, no error

  I am trying to trace the FFT of a certain number of waveforms, but I find that for some outputs simply return an array of "NaN" instead of the scale, with no indicated error. Looking at the data I see no significant difference that could cause this. anyone can shed light on the problem?

  I watched the formula apparently used by the FFT vi in aid detailed and created my own version, and he experiences the same problem with the same sets of data. Fathom what happens, it seems to descend to labview randomly taking one of my input data values and its reading like "NaN" - a bad size and TFF any fate of NaN. Why is reading that entry as NaN but is a mystery, and yet he does it regularly because the same plots always failed.

  I have attached the relevant vi to look, any help would be appreciated.

  You were asked to see if the data included NaN and you do not. The last element of the third data series is NaN. I haven't checked the other tables because it is something you need to do.

• Increase the number max of entries on the prompt for user input

  Hello

  I would like to increase the number of entries beyond 10 available on the input function query the user. Right now I use 9 of the 10 entries available each operating a Subvi a box structure. I seem to be limited to 10 entries using the prompt the user for input function, so it is there another way to ask the user to choose from > 10 entries preferably 20.

  Thanks for any help

  Chris

  Chris69 wrote:

  However the converted VI (sub dialog.vi) always seems to be using the names of VI express 9 for entries

  I don't understand what you mean by that. The VI has only some (all cases 'red) wire indicators to the connector pane. You have no other wireline indicators.

  Rather than having individual terminals, you must use clusters. For example, an indicator cluster for your case of reds, a group for your green case and one cluster for the 'other' options.

  Aside: You have a comment on the "Select up to 2 cases" façade, but all your controls are independent checkboxes, so there is nothing to prevent someone from checking all the boxes. I assumed that you currently have set the size of the window so great for debugging purposes.

• Bridge Tag requirement

  For door entry or requirement, if a Subvi meet several requirements, what would the syntax be?  I understand that I can put

  jyang72211-

  The correct syntax would be:

  [Covers: ReqID1] [Covers: ReqID2]

  or

  [Covers: ReqID1]

  [Covers: ReqID2]

  I hope this helps.

• Not a number/path/refnum simple Boolean?

  Y at - it an easy way for not a number/path/refnum return a single Boolean value telling if the entry had NaN // any where in its structure.

  I have a cluster of clusters of references I want to validate but I can't find an easy way to convert something that I can get a single Boolean of the structure. If only there wasn't a single cluster I would convert it the cluster in a table then or the elements of the array to see if it had references not valid.

  

  I did the examples above with NaN because it is easier to show than references.

  If I'm not mistaken, the in-memory representation for a cluster of clusters of Boolean data should be the same as a 1 d of Boolean array, so I think you should be able to type cast to a 1 d of Boolean array, you can then OR.

• Subvi entry

  I created a Subvi, which contains only the indicators and a few buttons.

  I attached each of the indicators for the component connector, but when I insert the VI in a block diagram connections only show as outputs.  How connections to become entries so that I can send data to the indicators?

  The VI is attached.

  Hi Chris,

  THINK THE STREAM! (This is how LabVIEW!)

  Indicators give, so the Subvi connected with them connectors will display data too.

  On the other hand, controls entered data. So when you need entries in your Subvi you create controls!

• How to make a table of entry into a Subvi homomorphic

  I have a sub vi who performs an operation on a table.  I wish I could pass this subroutine vi I16,-32 and other type of numbers and have it give me the same type of numbers.  In its current form, if I pull the Subvi, like a painting on the façade, the representation of the entry is "trendy" and all other types that I try to send to the vi show points of constraint and then output the same representation as the entrance to the Subvi... rather than the kind of data I provided.

  All thoughts.

  Thank you.

  The ability to create polymorphic screws is included with the professional version of LabVIEW.

• I can't have my Subvi simply use the default values for some of its entries?

  I use the code for a DS345 machine, using the sample code from here: http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=E3B19B3E9149659CE034080020E748...

  I use version 7.0 (because I'm in 7.1).

  Anyway. I managed to get the proper waveform I wanted, just stored waveform in the default values and frequency input, so I can some frequency I want input. When I run the example VI itself, it displays the waveform for the machine just that very well, however, when I use this example VI as a Subvi, it didn't come out of the machine data.

  Any ideas?

  Thank you

  Edit:

  When I say defaults for some of its entries, I mean the values that are usually connected by a user, controls that are not 'inputs' in VI.

  I understood the question, and I must say that I am embarrassed. If you look at the code, I'm feeding a resource VISA name, when the Subvi needs just a chain with the GPIB address number.

• Using the table as a MATLAB script for entry into a Subvi - labview crashes

  Hello

  I have problems in creating a Subvi, which includes a matlab file that has a table as input.

  I created a VI, who runs a simple matlab script, with a table as an input and a table as output. It worked well, until I assigned the terminals in order to to use as a Subvi.

  After that the terminals have been assigned, labview crashes instantly when you run the file.

  I also created a VI to test the Subvi, but I couldn't make it work at all, labview always crashed...

  Does anyone know a solution to my problem? They only thing I can think is to not use it as a Subvi, but then my master file will get huge as all the matlab code would be in there...

  attached are two files, so that you can better understand my problem. (test_... is the main file)

  any help will be greatly appreciated!

  -Jarno

  Edit: I'm using labview in 2013 with windows 7 and matlab 2014

  Hey, Jarno,.

  This is indeed a bug, unfortunately. Currently followed by using identification number of the 446431 cause. The question arise when moving from an array of doubles in the Script node. The only 'solution' at the present time is to use an array of singles instead. We are currently looking to identify a fix.

• Subvi in MUX 4 entry and PIN

  I have a problem with a LabVIEW 2009 issue:

  P4.3) create a Subvi than four multiplexed inputs to a single output. The Subvi should have four digital controls floating-point (labeled 1 thru In4), a digital indicator floating point (noted by outside), and a control unsigned integer 8 bit (denoted by Select). If the option = 1, then Out = In1; If the option = 2, then Out In2 =, if the option = 3, then Out = In3; If the option = 4, then Out = In4. (Tip: Select function programming VI > range of comparison may be useful.)

  -Where can I find the entire control 8-bit unsigned?

  -How to do the desired function?

  -How the select function in the indication would be able to help at all?

  I do not fear responses that force me to think. I am trying to learn this stuff.

  Any help would be greatly appreciated. Thanks, Matt

  Make a comparison on the U8. The result of the comparison is a Boolean value. Wire output for Boolean input select.

• Analysis.Math.Statistics fails when NaN values are included in the entry tables

  Hi all..

  With the help of Measurement Studio to Version 8.9 of .net. We need calculate statistics on a table that contains a double. NaN values. When I do this I get NaN as the result of any of the statistical methods (average, STDS etc.) ... Interestingly, the Math.ArrayOperations methods look like they work. Any ideas?

  Thank you

  gdssoftware

  Hi GDSSoftware,

  You see this behavior because the statistical functions with Measurement Studio ignore not input values NaN - that is why, they will return results NaN.  To work around this problem, you will need to filter these NaN values out of your input array before performing statistical analysis on this subject.

  If you're working with .NET 3.5 and later versions, you can do this by using the following:

  Double [] vals = new double [] {0d, 6 d, 10 d, 4 d, double. NaN};
  Double [] nanless_vals = vals. Where (d =>! double.) IsNaN (d)). ToArray();

  If you use an earlier version of the .NET framework, you will need to perform a loop on the table with the following (or something similar):

  Double [] vals = new double [] {0d, 6 d, 10 d, 4 d, double. NaN};
  List nanless_list As new List();
  for (int i = 0; i)< vals.length;="">
  If (! double.) IsNaN (vals [i]))
  nanless_list. Add (Vals [i]);
  Double [] nanless_vals is nanless_list. ToArray();

  I hope this helps!

  Kind regards

  Stephanie R.

  National Instruments