interpolate a 2D array

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• Reshuffle / Interleave 2D Array

  Hey guys,.

  Background information for the context:

  I know that the answer to this is somewhere out there, but so far I could not enter the right key words.  I set up a routine of analysis where I compare the monthly values by a category in which there are two "buckets" of information by month.  At the end of the day, this is all plotted on a graph to compare values from month to month.

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  Thank you for the responses guys.  I appreciate your thoughts and you have answered my question exactly as I had asked her.

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• How to add corresponding elements of two arrays in a continuous acquisition?

  Hi all

  I am writing a program (in version 9.0 of labview) to acquire the signal of a fast set. I use the acquisition rate of 1.25 Ms with an external trigger. Now what I need, is to add the "n" data these acqisitions and then further process.  E.g. If I signal to 200µs acqiring can total number of data points with the acquisition of 1.25Ms rate will be 250. I'll get a table 1 d of 250 data points whenever I run my acquisition.

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  Table 2 of the acquisition by number 2, 0.4, 0.5, 0.8, 0.4,... up to a total of 250 data points

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  Kind regards

  Champion

  I guess that time avarages and acquisition will not change during the measurement, so keep a cela outside loops. If you know your settings for made her make it constant.

  you create task (outside the loop) and a narrow at the end.

  Avoid the dashboard generation where possible. With no.. AV., and no. acq.points declared, the size of the arrays is fixed and you can (re) use a single Bay and replace the elements in the array.

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  I add a suggestion

• changing/variable index of an array on FPGA

  Hi all

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  See you soon

  Hello

  Well, I don't have first play dynamicaly with the Index of the Array of subset function entry.

  This is not supported in a SCTL, so that the planned behavior.

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  1 point by Point approach (as usually made it in FPGAs), using a function table of Index on the RefArray and with the use of counters to keep track of the Index, and evantualy count each sample collected.

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  You can use a loop in the context IP FPGA that auto-index the RefArray, to pick up the samples you want, in your sub-table.

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  5. the BRAM/DRAM can work with an interface of up to 1024 bits, 32x32bits elements for ex, then you might have used up to 32 items in you case (using the loose I32)

  So! In your case, I recommend that you use option 5 if possible:

  -Think of BRAMs, your table is starting to get impatient on slices

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  See you soon,.

  Steve0

  Hi Steve0,

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  Then go to the front, right click on the indicator and select "capture". From there, this table will be available on your range of data to drop as a constant of other VI in this project. You can also do the same with a CSV file by writing your CSV file to a flag and then enter the data to use.

  BeenCoughin

• Array of strings 1 d out of MathScript node

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  My boss came up with a way to do it, as shown in the attached VI.

• Empty array 1 d

  Hello

  I would like to declare an empty 1-d array in the MathScriptRT node.

  This code provides a 2D picture.

  a = [];

  In Matlab, I know that the above code will give me an empty 1-d array.

  Could someone tell me how to report?

  I use LabVIEW 2013sp1.

  Thank you

  An easier way would be not to use mathscript and simply use an empty table 1 d diagram constant.

• Bug in interpolate scattered 2D

  I spent a lot of time to reduce a problem that I had seen and came to the conclusion that, in my view, that there is a bug in the scattered VI 2D interpolate. Because this VI implements just the code of the matrix, I suspect that the bug is actually in the underlying code of the matrix Solver. On the business.

  I tried several data sets, but I have narrowed down to some very simple data that you will find in the attached VI, which is a copy of the diagram of scattered blocks 2D interpolation (with some modifications). X and have been made to be ramps from 0 to 10 with a length specified on the front panel. Values of Z are simply a random input between 0 and 1. If you specify the length (number of points) as something other than 208 points, you will get the correct answer (the Z is a random value, but the correct answer must be something on the order of 0 to 1). However, if you specify exactly 208 points, an incorrect answer is returned (by hundreds... where it should be between 0 and 1).

  I tested with a range of data sets, and if the number of datapoints exactly 208, then the answer will be inactive about 1e3 1e4 factor or more.

  Anyone nor able to comment or anyone else seen this problem? The VI is saved in 2016.

  Hello

  Thanks for reporting this problem. I think it may be a bug in the underlying implementation of linear equations Solver in the DLL. I bring a CAR to track this problem.

• How to use setarraybounds to resize 1 dimension of a 2D array?

  Hello:

  I use Teststand2013,

  SetArrayBounds (FileGlobals.Drt_Step_Data_Filt, "[0] [1]", "[3] [3340]" "") to set the bounds of the array 2D "FileGlobals.Drt_Step_Data_Filt."

  When I check in the 'view of look' limits lies in what I want [0.3] [1.3340].

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  and SetArrayBounds (FileGlobals.Drt_Step_Data_Filt [0], '[1]', "[3340]") is not a job.

  What can I do to change 1 size of dimension of a multi dimension array?

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  Hi johnnnywang,

  When you look at a subset of table in TestStand, it will always be 0 indexed. If you want to be able to set limits on the subset of table, you assign as the value of a variable. For example:

  Step 1:

  SetArrayBounds( FileGlobals.Drt_Step_Data_Filt, "[0][1]" , "[3][3340]")

  Step 2:

  FileGlobals.Drt_Step_Data_Filt_Subset = FileGlobals.Drt_Step_Data_Filt[0], SetArrayBounds(FileGlobals.Drt_Step_Data_Filt_Subset, "[1]","[3340]")

  In this way the resulting FileGlobals.Drt_Step_Data_Filt_Subset will be indexed 1.

  I hope that helps!

• How can I add a NSV for a 2D array?

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  Build the table. You can change the property of an array of 1 D in 2D.

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• Boolean index in the array

  In Matlab, often use a Boolean array to access the specific values in a table.

  It is a good way to reduce the itterative loops and improve the speed of the code.

  I'm trying to find a way to do this in a Mathscript node, otherwise the code takes forever to run.

  Common code in Matlab and Mathscript:

  a = [1,2,3,4,5]; % This is normally a much larger range

  b = [1,0,1,0,1]; %I whether Boolean, but by default it's double

  c = b > 0;  b change % to boolean

  d = [9,9,9,9,9];

  The Matlab code is:

  d (c) = a (c);

  d

  > d = [1 9 3 9 5]

  If I run the above in Mathscript, I get the following error:

  In Mathscript, to achieve the same result "d" I currently have this:

  for i = 1:length (d)

  If c (i) == 1

  d (i) = a (i);

  end

  end

  d

  > d = [1 9 3 9 5]

  A slightly faster version is:

  for i = 1:length (d)

  j = 1;

  If c (i) == 1

  e (j) = c (i);

  j = j + 1;

  end

  end

  d (e) = (e);

  d

  > d = [1 9 3 9 5]

  Any ideas?

  Thank you

  Hello

  The code you have posted works fine in the MathScript in LabVIEW 2009 node as well as in the MathScript window and the MathScript node in LabVIEW 8.6.  As such, I'll assume that you have found an error in the window of MathScript in LabVIEW 2009.  We have already identified this problem and currently filed the bug report 151999 for her.  You see error message did not come through in your post, so I guess it is-90026: ' indexes for an indexing operation matrix must be real and positive integers. "  The problem is that we do not treat the indexing variable 'c' as a boolean type.  As a result, it reports an error when it tries to use the index 0 instead of a fake.  We are working on a fix for a future version.

  To work around the problem in the MathScript window, you can use find instead of any Boolean indexing command.  It should integrate more quickly than the implementation of loop that reference you.  Instead of
  d (c) = AC;
  use
  d (Find (c)) = a (find (c));

  Grant M.
  Staff software engineer | LabVIEW MathScript | National Instruments