Boolean entry

Similar Questions

• Building a structure to deal with four Boolean (true or false) input.

  I currently have two Boolean inputs that I would use to select a structure of business cases. I would like to have the four cases, each depends on the two Boolean true/false question. If variable Boolean 1 = true, then case 1 must be used, if Boolean 2 = true, case 2 is to be used, etc.

  What structure use to convert these Boolean entries in digital case?

  Build table for two Boolean values, then a Boolean table number.

• void / vi based on the Boolean value

  Hello

  I have a main vi and I want to call a subvi based on a Boolean value, that is when the Boolean entry gets the true value, the sub - vi must run, otherwise it shouldn't.

  To do this, I added the Boolean control component connector of the sub - vi and I added a while loop in the sub - vi, which has 'continue if true' condition. I also made this point prescribed to the subvi.

  However, I noticed that even if the Boolean value false maintains execution of the sub - vi.

  Can you get it someone please let me know what the problem with this approach?

  Thank you

  Despres

  Put the Subvi code (or the Subvi set) inside the true case of a case structure and wire your boolean to that.  I prefer the second option.

  

  

• Problem updating my state machine, using the emg signal

  Hello

  I have problems with my code. My entry is an EMG signal that I gather from three different electrodes using usb 6008. In the program, I divide the signals and display them in a chart that is unique. What I want now is to read the signal, and if a signal passes a threshold I want an LED lights. This must remain lit until there is another signal that passes the threshold.

  To put it simply: "large enough signal--> lamp on--> stay informed--> enough large signal--> lamp--> stay off the coast and then start again."

  I tried a few different approaches, but I decided using a state machine. Now, the problem is that when the signal to enter the state machine the program crashes. I think it's because the table that I use to convert the signals does not update when I get my state machine, so the signal stops to come. But how to get around this problem? It is even possible to code what I want?

  I have attached the code. All the tips are welcome, I have been struggling with this for some time now.

  Thank you

  jenmich

  The problem is internal while the loop is run until the stop condition is true, but he never does a new Boolean entry. So that it remains for always in the same State. Remove the inner loop and put the shift register on the outer loop instead.

  You must also use a daqmx configures the element, and then set the properties of daq. The read.vi can be set to read a number of samples of each iteration.

  Also: you can expand the table to index for several items of output. If you want that element number 0, 1, and 2, you have yet to wire the index entries

• 1 error in writing on a text - installer with Application Builder file

  I wrote an installer using the Application Builder to install the runtime engine that allows any computer without LabVIEW to run an .exe program. Setup runs and installs engine race and then as a .exe VI. When it is done installing, the .exe VI opens automatically.

  An error appears when the .exe opens and says "1 error in writing to a text file". If the user clicks on the error that it can run the program without problem, it converts file formats in a file .lvm. Automatically, it generates a new file name and saves the file in the same directory, but with a different name.

  Why did it only happen when opening first upward? The program tries to run when it automatically opens? Is there a file path residual left in the program that trys to run first, before that the user put his own file path in the program?

  I am semi new to labVIEW (a few months) and that nothing shows that would create this error at the beginning of the program.

  Thank you

  Hi Scott,.

  Well, you could model a little VI and turn on debugging highlighted to test your idea!

  THINK THE STREAM!

  How a Boolean entry should WAIT for the action of the user? It should be read according to the stream!

  What this small pseudo-code:

  REPEAT
  
    Wait (50ms)
  
  Until the button

  Or how about an event in the user queue structure?

• flatten channel adds the length of the string

  Hi all

  I flatten a cluster chain help to flatten to string.vi. The cluster contains strings and arrays. The flattened string contains the length of the string that is appended to the string.

  So if I have a cluster with only 1 string and a value = "LabVIEW". the flattened string would be "0007LabVIEW". Flatten channel vi has a Boolean entry "add string or array of size? even if I set the Boolean value false, it always adds the length of the string. Is this a bug?

  I think that if you read the detailed help to flatten it to string function you will see this is not a bug.  That boolean applies only to top-level data, once put you something in a cluster or array, the Paris are open.

• Cluster of savings in the form of binary data

  I have a compound cluster of ~ 50 items of different types that I need to save it as binary data. Obvoiusly I could do with the method of "brute force" of 50 different entries in the file, but that seems silly.

  Is there an easier way to empty just the disk in the form of binary data?  By registering as a cluster seems to add extra characters.

  In a world of LV, I just recorded in as a variant, but it must be saved as binary raw in order to be read by another program as a C structure.

  There is the beautiful Boolean entry in the binary write for "add/array of strings of size."  Unfortunately, this boolean applies only to the type of upper-level data that is being written.  So whatever it is inside the cluster will always these lengths prefixed.  Therefore, you have to separate your data and write each piece individually.

• 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.

• write 1 d digital table in a binary file and start a new line or insert a separator for each loop writing file

  Hello:

  I'm fighting with digital table of 1 d writeing in a binary file and start a new line or insert a separator for each loop writing file. So for each loop, it runs, LABVIEW code will collect a table 1 d with 253 pieces of a spectrometer. When I write these tables in the binay file and the following stack just after the previous table (I used MATLAB read binary file). However whenever if there is missing data point, the entire table is shifted. So I would save that table 1-d to N - D array and N is how many times the loop executes.

  I'm not very familiar with how write binary IO files works? Can anyone help figure this? I tried to use the file position, but this feature is only for writing string to Bodet. But I really want to write 1 d digital table in N - D array. How can I do that.

  Thanks in advance

  lawsberry_pi wrote:

  So, how can I not do the addition of a length at the beginning of each entry? Is it possible to do?

  On top of the binary file write is a Boolean entry called ' Prepend/chain on size table (T) '.  It is default to TRUE.  Set it to false.

  Also, be aware that Matlab like Little Endian in LabVIEW by default Big Endian.  If you probably set your "endianness" on writing binary file as well.

• Line break in the replacement string

  Is there an easy way to replace all the cart in a string?

  Like I said, one call will do. The service has a Boolean entry called "replace all? (F)"......

  Norbert

• using the comparator and DAQ to light a LED

  I use a comparator in Labview to compare the sine wave with a fixed voltage and then displays the result (1 or 0) on a waveform graph. How can I use the result of the comparison to the output of a data acquisition to light a LED (eg. when the result is 1)?

  In LabVIEW, click ... ... ... ... .  The block diagram for VI will show you a table of Boolean as input.  In order to use a single Boolean value instead, specify a single line in the VI 'create task' (for example, Dev1\port0\line0) and plug your LED to this axis.  Then, in the code, select "single channel / simple sample / Boolean instance (1 line) of writing DAQmx.»  Wire then the exit of your writing's Boolean entry DAQmx comparator.

  If you change the VI, save it under a different name in a different location.  NOT crush the example of VI.

  Hope that helps!

  d

• Parameters of the effects of rasterization of the document... again...

  Hi all

  I know this has been asked a couple of times before, but I don't think that anyone has ever confirmed the correct way of querying or setting these values.  I use the CS3 SDK on Mac OS X 10.6.2

  So as the topic says I'm after values in the dialog "Document Raster Effects Settings... "located in the menu"effects ".  Specifically, the "resolution".  In my view, that it was suggested in previous discussions on this to look at the "outputResolution" of the AIDocumentSetup struct field.  The CS3 SDK indicates that this field is 'unused' and the field itself always seems to have the value 800,0 for me.

  I've noticed that these values are local to the document itself and their change causes the indicator documents dirty. So I thought that maybe they are stored in the document dictionary.  Then I poured the main dictionary of the document and found strings 'Resolution of pixelation AI9 exit' who always seems to be 300 (after having to guess the data type).

  I don't know where else to look at.  These values must be stored somewhere, as they are saved with the document.  I can easily visualize in the context of the document via an Applescript dictionary Explorer object, but I refuse to believe that Applescript has access to a value that I have no via a plugin.

  If anyone can help me shed some light on this I would really appreciate it!

  W

  Nevermind, I found the dictionary entries. The document dictionary has an entry named 'AI Auto rasterize'. That itself is a dictionary that contains the following entries:

  "padd", true entry (Padding)

  Boolean entry "mask" (create a mask)

  'spot' input Boolean (preserve spot colors)

  input Boolean "alis" (anti-aliasing)

  "dpi." entire entry (DPI, Yes, it's a dot at the end)

  integer entry "colr" (combination of model color & background color)

  Last one should have a little of the investigation. I think that there must be an enum for it somewhere in the headers, but when I changed the CMYK (with a transparent background) in gray scale (with a transparent background), according to me, it goes from 5 to 4. When I tried to CMYK (with white), he went to 1. So, these two parameters are obvious tied up together, but in the worst case, we can just draw once and done with it.

• Analysis of the chain: entry Boolean

  Hello to you all!

  I noticed a strange (for me) behavior of string function analysis.

  If I want to use it to read the string, but instead writing the format string (%s %d %b (...)) I wish to state the type of connection type corresponding to the entry.

  And when it comes to reading or digital - channels there is no problem, but with the Boolean values for a reason, the function does not interpret 0 as False value and 1 as true. If I connect the string with the %b Format - it works fine...

  Here's the snipped:

  

  Is this a bug or a well known?

  PS: my apologies for my English - this is my 2nd language...

  0 and 1 are the binary representation of the Boolean type. If you open the help file on a Boolean control, you will see that the value of type boolean are TRUE, FALSE. If your string contains TRUE, FALSE, T, F, True, False for examples, he recognizes as a Boolean value.

  In your case if you do not use a format string, you can use a constant U8 and not equal to zero use.

  

  Ben64

• How to set a Boolean that only changes Its True/False when there is an entry "real"?

  A group of numbers is used as my entry. Currently, I want to put my code like: when the input is greater than a certain number of threshold (4 for example) it will display the true value, and it will not change false until another larger than 4 entry appears. Our problem right now is that it displays false if the entry is less than the threshold (4) when you want to keep it real.

  Please help me, thanks.

  I should have warned the OP I like Rube Goldbergs... Yes, a XOR function should be used here

  

• Looking for a Boolean function similar to or, but do not wait for the second entry in case he gets a 'real' a single entry

  my program works in 2 processes in parallel inside a while loop and should stop when one of them ends.

  How can I do? Uses the function 'Or' wire loop the stop condition will not do the job, waiting for the two processes to give their comments before running.

  What I really need is a function that waits until she gets a 'true' through one of its entry and then executes without waiting than the other.

  Y at - it such an option?

  If not, does anyone have an idea how to achieve what I have described here?

  Thanks in advance!

  What you need is a "not synchronous or", i.e. "do something if Item 1 becomes real GOLD point 2 becomes true.  One way that comes to mind to do is with a design of producer/consumer model (event), where the consumer is a State Machine with a shutdown state.  Get 1 point to trigger an event (perhaps using a user event or property Value Change (follow the signs)) when it turns out true, and have it send to the consumer the Stop State.  Download point 2, to do the same thing.  Now one of them becoming true will cause the shutdown state be registered (without taking care of doing the other element), in other words, that becomes a real, (consumer) loop stops.

  Bob Schor