Table 2D 2D subset

Similar Questions

• Replace the subset of table operation

  I have a code to a key VI event down that toggles the visibility of some indicators in response to press the function keys. Records using Boolean shift, the code worked with a few indicators.

  To scale to a large number of indicators, I decided that I would need convert a registry to offset single Boolean array.

  With the shift table Boolean register, for a given function key, the code reverse the Boolean value of the table for the property node Visible, then replaces the same item in the table of Boolean with the inverted Boolean value. The code does not work. Once the indicator is visible, he won't go invisible on the next push of button.

  I watched the execution, display values. Looks like that replace it table subset VI is not replace the Boolean value with the updated value. In the attached screenshot, you can see where I got the element of the array once it has been "updated" to replace table VI of subset. Impossible to find all the bugs in the list of bug LV2013.

  See the attached screenshot. What's wrong with this code? My apologies for the resolution of the screen capture. If necessary, I'll go back to the lab and try to capture a screenshot of higher resolution.

  On-screen turned your empty Boolean arrayis, in other words, it has no elements. Subset of the table Replace does not work with an empty array.

  See you soon,.

  McDuff

• Search in table 1 d for a specific table

  Hello

  I have a 1 D table list consists of series of 1 and 0. Consider the size of this data table is 1000

  Now I would like to find in this table for a specific as model 00110101 or random sequence. While there could be more than 1 match in the table 1 d

  and I would like to get the index of the first element for all matches.

  Would you please help me with this code. First of all how can I search for an item in table not only a (search1D array.vi no) and also how do I get the index for this game

  Thank you very much

  I have a table of data consist

  Brute force

  For loop (no automatic indexing)

  On the inside of the loop get subset of table a clue to a length of time set all search pattern.

  Table pattern equal subset? If true for loop iteration is the index of the mapping table.

  Repeat until the end of the table - length pattern + 1 times.

  Try it and your zip code.

• How to eliminate elements in a 1 d table

  I want to know how to delete items from table 1 d. I say 1 d table has 30 items. I want to keep 10 original and get rid of the remaining elements of 20.

  How can I do that. See picture attached for more details

  Thank you

  JK

  

  Have a look at the table of LabVIEW functions. There is a deletion from a table or a subset of the array that you can use for your application.

  Kind regards, Jens

• Best way to update the individual rows of a Table?

  I took a quick glance at a few examples, but did not get a clarification on this.  I am looking to have something close to a listbox control or the table to where I can update just one column of values to line a 1 time per second pace.  I'm looking to display our acquisition of data values in a table or a listbox control.  The single list box seemed to work well for that, but I couldn't use the row headers to list the names of channel beside the channel values.  I thought to link the values of cursor in two areas of list to do this, but did not find any info on it for the single list box.

  I have a few questions:

  (1) I have a 1 d table to where I want to use this data to constantly update the first column (with a multitude of lines) of a table.  I'm looking for the best route to not take too much time for treatment by doing this.

  What is the best way to update the individual rows of a table?   Invoke the node "Value of the cell value"... or is there another method?

  (2) why is that, after each iteration else, row values are deleted?

  Also, for adding additional channels originally arrray... it is better to use the 'Array' subset then the function "Construct the table" or function "Subset of the table" and "insert table"?

  See the attached example.

  Thank you.

  Jeff· Þ· Bohrer says:

  (2) why is that, after each iteration else, row values are deleted?

  Classic race condition.  dump the loop and node-p and just wire the 2D table on the terminal Board. !

  I don't see the race condition.  What I see is the table once the last element has been written for it all run the oil.  I saw looked it with point culminating performance on.

  But I agree entirely with writing to the Terminal.  It is a 1 d array, so you will need to use an array of generation and convert a 2D array in order so that he could write correctly.

• Are published network shared variable write & read Atomic actions

  Hello

  I have a very basic question about shered (published network) variable.

  I think I know the answer already, but since I couldn't find in my documentation, I thought that it is more prudent to request...

  Are reading and writing on a shared variable of stocks Atomic?

  To be more precise: on my target real time I create an array with data (each element being the configuration item or a cluster containing name, value, and type) and when the table is finished I am this store in a published network shared variable.

  On my host (Windows), I'm voting (in a loop) until the table contains at least 1 item, when this is true I'm parsing all the elements in the table.

  Is there a chance that, reading of the shared variable, the table contains a subset of the original painting on RT target (i.e. the action of reading takes place while writing is still ongoing).

  Or is the action of reading delayed until the write is completed? (i.e. both write and read actions are atomic even over the network)

  I think the latter is true but not could find no evidence in the documentation.

  Kind regards

  SoC

  Hello Rob,

  Yes, you can access the entire value, data type - you use both. For the table data type, the integer value is actually the full picture. So, Yes, you can see reading and writing as Atomic actions.

  But, on the other hand, you can lose data if the RT system rewrites the variable before the host had the time to read. To avoid this, you can enable buffering for the variable. See the following links for more information:

  http://www.NI.com/white-paper/4679/en

  http://zone.NI.com/reference/en-XX/help/371361H-01/lvconcepts/buffering_data/

  Finally, you can also activate a FIFO RT on your target RT if you need to send data through the variable in a deterministic section of the RT. See also, more information:

  http://zone.NI.com/reference/en-XX/help/370622H-01/lvrtconcepts/rt_projectvariable/

• Suggestions to maximize the performance of loop of RT

  I've attached a screenshot of a small portion of a RT data acquisition and treatment program. This loop treats 1 second blocks of data from a FIFO RT but very rarely (about once per day) the loop is slowing to the point where he is not able to track the data blocks 1 second coming from the producer loop (not shown). Normal loop iteration time is about a half a second, but when he falls behind, iteration rate slows down until almost 2 seconds and does not recover.

  The incoming data for the treatment are an array of 14 waveforms, 102400 each of the samples.

  1 channel is peeled off very early for the treatment of tachometer. For other analog channels, there are a few calibration and light filtering/RMS calculation then the data is sent to an another RT FIFO. Then the analog channels are highly filtered, decimated and sent an FFT / unit conversion/integration VI. The FFT results are transmitted over the network and then checked for overtaking in VI connected to the shared variable of the network 'fireplace data '. Step much more time of the whole process seems to be the wave filter vi form, just after the RT FIFO first write operation.

  I'm looking for suggestions on improving the performance and the deterministic nature of this loop. So far, I've only tried to turn off debugging and reentrant inline, all the vi if the sub vi supports. These measures have helped, but I see the question coming. I'm willing to try anything, so just point out something that does not look quite right. I will be happy to provide more details on one of the vi if this will help.

  I could considerably improve the performance by using the place in the structure of the element for the same vi, calibration and decimation. Then, I replaced all build tables with a subset of spare board. Finally, I have pipelined loop into two distinct stages. Since the target RT uses only one heart, so I don't get a multithreading performance gain, but it seemed a little better job, I don't know why...

• Extraction of elements of the array

  An array of output of 16 x 1, I want to extract 9 x 1 output array.

  Someone has any idea how to proceed in labview?

  Hi himanshub,

  in the range of functions of table you will find "index Board" items unique index (scalar, line/column, page, etc.) to a table or a "subset of the table" for the consecutive elements...

  As this is a really basic question I would also propose to take the course available in the academic section free online

• How to use Excel information Row.vi last in a prison guard?

  Hello

  I called an excel file in my labview and I can see the line number of Excel get last Row.vi. but I need to use that line number. How can I notice that? now it shows just for me, I could not use cluster in table conventor or subset of the table. can I do it?

  TNX

  Best regards

  You use "Ungroup by name function"?

• Generate the analog waveform based on the data file

  I want to create an analog voltage output that follows I have a data file (excel, csv, text (which is easy)).  The data file creates a waveform with equal time between steps (dT =.0034 sec).  After the output through all the data points, I want it repeat indefinitely.

  What is the best way to create the waveform of a data file?

  To create a type of waveform data, calculate the dt by subtracting two values in column 1 and get the array of Y from column 2. If you save the file as a comma separated or tab text file, you can then use the spreadsheet file read. After obtaining a 2D array, you would use the index table and the subset of table functions.

  Assuming you use a capture card data OR for the output signal, you can pass a type of waveform data to a writing DAQmx and set for the generation of types.

• MEMBER OF

  Hello
  
  MEMBER TO check if a (1) row exist in a table. What function can I use to check if there are lines more then one in a table?

  If you want to test if all records from a table (not a nested table) are a subset of another table, then use less and count as follows:

  with a as
  (select 1 id , 'peter' name from dual union all
  select 2 id , 'rob' name from dual union all
  select 3 id , 'john' name from dual
  )
  
  ,b as
  (select 1 id , 'peter' name from dual union all
  select 2 id , 'rob' name from dual union all
  select 3 id , 'john' name from dual union all
  select 4 id , 'brian' name from dual union all
  select 5 id , 'steve' name from dual union all
  select 6 id , 'andrew' name from dual
  )
  
  select
    count(*)
  from
    (
    select
      *
    from
      a
    minus
    select
      *
    from
      b
    )
  

  If the result is 0, then all the rows in a are b.

  Concerning

  Peter

• generate the subset of the decimal table to an array of Boolean

  I have a decimal table 1 2 3 4 5 6, and I have a boolean with the same table size 0 1 0 1 1 0.

  How can I retrieve the subset of the decimal table of the corresponding "1" position of the table of Boolean (in this case 5 4 2)?

  The value of the Boolean table are editable (casting either 1 00100), so the size of the array decimal subset is not fixed (1, 4).

  (I assume you mean digital Board. "Décimal" is just a specification of formatting and irrelevant for this)

  Try something like the following (the FALSE case has just wired table in the whole unchanged):

  

  (In case you're dealing with huge paintings, a few performance modifications should be made so that everything goes more in place.)

  (Sorry for the spelling errors, ignore them )

• subset of table truncate the end of the 2d array

  The intention was to make a program that would generate asynchronous several different signals in a buffer.  Then something would consume the buffer - an output daq, and signal processing.  I created a dummy consumption which takes only 1% over the beginning of the buffer.  Whenever the buffer is smaller than the specified size, more signal will be added at the end.

  I ran into a problem where the function of the subset of the Array is truncate the end of the subset sometimes, so I disassembled the program until a congruent portion of the code exists to cause the problem.  It seems to be the use of memory or related allowance.  Maybe I'm doing something that I shouldn't be, but it seems like a bug in labview.  In the block diagram, I have a note that shows a waveform wire that goes to a case statement.  Just remove this thread causes it to work properly as seen by the consistency of the waveform on the front panel.

  I'm using Labview 2014 (without SP1)

  I would be grateful for any ideas.

  To work around the problem, use the copy always at the moment. I'll try to engage someone R & D of LabVIEW to get the last word.

  In any case, it seems unnecessary to carry all these t0 (which is always zero!) and dt (which is always the same. Constantly from waveforms to bays and back just really clutters the code. If dt would be different between the waveforms, you would have a much bigger problem .

  I understand that your actual code is much more complicated and what you show is just the tip of the iceberg lettuce.

  Here is a general overview of execution project ideas.

  • Use 'building the table' (concatenation mode) instead of "insert into array. It's cleaner.
  • Use simpler and easier to read the code to find the size of the table smaller
  • Only use tables. You can define once and dt for all graphs.
  • Use the correct representation for buffer size controls.
  • Don't place unnecessary sequence structures.
  • I don't think that you really need that local variables, the terminal is written often enough (stops you extra copy of the immense tables in memory!)
  • Do not know what is the structure of matter, but I left it in for now.
  • Add conditionally empty bays, just wire the table via unchanged instead.
  • ...

  

• Table 3D: cannot replace the 2D subset?

  Hey guys,.

  I discovered a rather strange event (if any). In debugging my code, I stumbled upon my function replace table subset to find that it was the source of my frustration. Either I don't understand how it works for 3D arrays (I use it a lot for 2D, 1 d) or there is a bug. I have attached a picture of the code examples here. I can't replace a 2D picture into my table 3D. I would like to take a page from the 3D and replace it with a page of update / different. The example image is sure to strongly the oddity.

  Any thoughts?

  Regardless of the size of the input array, the result of the table replace never increase the number of items.  You try to grasp the first page, add a line, then replace the first page.  The result is that the replacement is cropped to the initial first page size, if you have a developed NOP (no operation).  Move the entries in your table to build on it and see what happens.

  You can't replace an item that does not exist in the input array.

• Subset of the table

  If this isn't really a specific problem of labVIEW, more a problem with my mind does not not as a true programmer to find a solution to a (problem probably straight forward).

  I want to process some data (table of numeric values). The data table is replaced each time new data is available, I have this simulated a little in the attached VI. Now here's the tricky part. The processing window is selected by the user. So if the length of the Strip is 5 elements and the user selects a 7 processing window, the table of the first iteration should be stored (this is not hard using a registry of lag...) and the first 2 elements of the table on the second iteration will be added to the table in the first iteration, then the processing will be done on the data.

  I hope this makes sense, I have attached a VI of a terrible effort for a solution on my part, but I tried a few different ways in this regard and am getting nowhere nearby. I'm sure that registers to shift and/or nodes size table and deal structures, comments should be the main elements.

  Let me know if you need more information.

  In the consumption loop, starts with a shift register that contains a table.  Whenever new data are attached at the beginning of the table.  Then iterate over subsets of the table until the length of the array is less than the size of treatment.  See picture attached (similar to the approach posted by stevem181, his answer appeared while I was working on it).