Connect an 1-D array of cluster of 3 elements with dynamic data
hi everybody.
I am trying to wire an 1-D array which consists of a cluster of 3 elements with dynamic data. The error that appears says that I'm trying to "connect two terminals of different types". Actually, what I want to do is write to a file the FFT data produced by the Spectral Measurements vi. In order to write to a file, I am using the Write to Measurement File vi, but I don't know if this is the right way to do this. Has anyone any idea about this problem, because I'm out of ideas....
Thanks a lot!!
ok! This works really good! thanks a lot! now i'm facing an other problem...The output file does not contain the right data. I want to collect the FFT (frequency vs. amplitude) of a time signal and it gives me the record length and the sampling rate instead.
For example, if I use a sampling rate of 300 ksamples/sec and a record length of 1000 sampling points, the file to be created has one column containing the record length e.g.
0
1
2
3
498
499
and on more column containing almost zero values and the value of the sample rate. Do you have any idea why this is happening?
Thank you!!
Similar Messages
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Connect 1 D array of cluster of 2 elements with dynamic data
Hello
The type of source is 1D array of cluster of 2 elements and the type of sink is dyanamic data. Can any one guide me how to connect these 2 elements together. Any response would be highly appreciated.
ThanksFirst, this question would more appropriately be posted to the LabVIEW Board. It is not a signal conditioning issue.
The dynamic data type (DDT), sometimes referred to as the "evil dynamic data type," completely obscures the internal data structure. The only way someone could help is if you tell us what the source is expecting the internal data structure to be. The only objects which want DDT inputs are Express VIs, which are also good at obscuring thier contents. Implementing the sampe funcitonality with standard VIs might be a better approach.
You also have not completely specified the source. What are the data types of the cluster elements?
Lynn -
Hello,
in my vi I have a chart with 5 Plots displaying measurement data.
The user should be able to save all the history data from the chart at anytime. (e.g. the user watches the chart and some event happens, then he presses a "save"-button)
I know, that I can read out the history data with a property node. That is not the problem. The problem is, how do I handle the data? The type of the history data is a 1-D array of cluster of 5 elements.
I have to convert that data somehow into a 2 D-array of numbers or strings, so that I can easily save it in a text-file.
How do I convert a 1-D array of cluster of 5 elements into a 2-D array of numbers?
I use LabVIEW 7.1
Johannes
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Solved!
Go to Solution.Gerd,
thank you for the quick response and the easy solution.
Look what I did in the meantime. I solved the problem too, but muuuch more complicate :-)
And I have converted the numbers to strings, so that I can easily write them into a spreasheet file.
Johannes
Message Edited by johanneshoer on 04-28-2009 10:39 AM
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Attachments:
SaveChartHistory.JPG 57 KB
SaveChartHistory.JPG 57 KB -
1D Array of Cluster of 2 Elements Write to Spreadsheet
Hi all, first time using LabView in many years. I am trying to write a VI that will acquire data from our cDAQ (right now just trying to get it to work with a single thermocouple in a NI 9211, but eventually will be 8 X thermocouple, 4 X pressure transducer), display it in realtime on a plot, and then when the acquisition is stopped, output the data to a file for later use. I am currently using the Base LabView package.
My problem (as I remember it was 7 years ago when I last used this) is with the data types not working together. This is my thought process currently on building this VI. Everything is inside a While Loop with the Wait function at 1000ms.
- Acquire a point of data using the DAQ assistant
- Send that point of data into a bundle
- Send the iteration count into the same bundle (as a timestamp)
- Send the resulting cluster of 2 elements into a Build Array function
- Send the resulting 1D array to a shift register in the While Loop, as well as to an XY graph for realtime plotting
- Wire the incoming point on the shift register back into the Build Array function
In my mind, this allows the XY graph to plot the complete array every iteration, giving a realtime view of the signal. Everything works fine up to this point. My problems are:
When I stop and restart the program, the shift register is not cleared, so the existing data in the array remains on the graph. I know I need to initialize the shift register to clear it, but I cannot figure out what to wire to it that will be compatible with the data type (I just get broken wires with everything I tried).
Similarly, I cannot figure out how to output this data to a spreadsheet after I Stop the While Loop. I think I should wire the "Write to Spreadsheet File" VI to the outgoing shift register, but again, I can't get compatibility with data types (source is a 1D array of cluster of 2 elements).
I have attached my current program "Production" to this post.
I look forward to the help!
Brad
Attachments:
Production.vi 46 KBHi Brad,
I would suggest you change your architecture. First, to answer your questions:
1.
In order to ensure that your shift register is not reading the last
value from it's memory location, you just need to create a constant for
the shift register. To do this, right-click at the input of the
'left-placed' shift register and create a constant.
2. The Write
to Spreadsheet is expecting a 1-d or 2-d array while you are wiring a
Dynamic Data Type. Use the Convert from Dynamic Data Type to convert
the data into the appropriate waveform after which you can get the
waveform attributes which includes the values and the timestamp data. Or, you can use the Write to Measurement File to write to a .lvm file which can be opened in Excel as well.
Changes to your architecture:
Since
you are using a lot of channels, I would advise you use a
producer/consumer architecture. You can have a look at this
architecture by navigating to File -> New.. and searching for the
Producer/Consumer template. You will notice that this architecture uses
queues. The way you will design your VI is to use DAQ to acquire the
data into your producer loop, convert this data into a waveform and
then send this data to the consumer loop via queues. In your consumer
loop, you can write this data to a file. At this point, I would
encourage you to write to a binary file instead of a spreadsheet file. The write will happen faster and you will be using less space on your hard disk when compared to ASCII writes.
I know this can be real confusing for a beginner, so be sure to post back if you have any questions.
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies -
Adding an element in an array of cluster of 2 elements
Hi all,
I have a 1D array containing a cluster of 2 numeric elements (= 2 rows of 100 values).
From this array, collecting new data in for loop, I want to create another array containing a cluster with 9 elements: in each for I want to add an element (= like one row).
After this, I want to compare data from one element with a fixed value, and when the value is find in the element, I want to extract the values of the 8 other elements at this point.
Thanks
DzeSorry I didn't understand you well. To use only arrays, you'll need 3D arrays, as you can see in the example attached. I've made two variants, one with your method (don't know if there's an easyer one) and one with the method I think is easyer, after that, you can search in the 3D array easyer that in the array of clusters of arrays (uff...). If I misanderstood you again, please let me know.
Hope this helps
Attachments:
arrayclusterarray.llb 50 KB -
Saving data from 1d array of cluster of 2 elements: HP 8752 driver
I'm using the following driver to communicate with my HP 8720C Network Analyzer
http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=E3B19B3E9092659CE034080020E748...
...So far I've easily been able to use the "collect and display data" vi, except for saving data. All I want to be able to do is save the data from a single sweep in spreadsheet format. Displaying the data is no problem, which I can then print, however, the output data file is a mess. The VI is rather complicated, and I can't figure out how to save the data in a nice pair of columns of numerical values.
The VI's output data is in the format of a 1 dimensional array of clusters of 2 elements (ie the x-y values). I would've thought it would be trivial to do this, since this is the standard format for data for the classic X-Y graph. So far, I haven't been able to come up with anything. Any ideas?
Thanks,
SpenceFeed the array of clusters into a for loop with autoindexing enabled (the default). Inside the loop use the Unbundle primitive to extract X and Y for one point. Use Build Array to make a two-element array from X and Y. Wire this array out of the for loop and you will have a two dimensional array with two columns and as many rows as there are elements in the array of points.
Lynn -
Business View data foundation with dynamic data connection hangs
We are running Business Objects XI 3.0 with Crystal Reports 2008 and Business View Manager 12.0.0.683. In the Business View Manager tool, when I try to open a data foundation that uses the ACD Dynamic data connection, it hangs with the hourglass icon. I have left it trying to open for at least an hour before killing the Business View Manager with the Windows Task Manager. Data foundations using a static connection open fine as do the elements and views based on the data foundation with the dynamic connection. The static data connections included in the ACD Dynamic connector point back to an Oracle Server. Any ideas how to get the data foundations to open so I can edit our custom business views?
Thanks,
KathyI created some Views to pull the data in from the Oracle side.
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How to generate SWF file with dynamic data but no live connection
Hello,
We got a requirement where we have to email out SWF file either in PPT or outlook generated from BOBJ universe. When the file reaches the customer who would be outside our network with no access to our servers or data should be able to view the swf file with data. So the goal is to generate these files automatically and should not prompt for BOBJ login or wouldn't have ability to query the database but need to report data pertaining to the customer.
Any help in this regards is greatly appreciated.
Thanks
ManoharHi Manohar,
You can use QAAWS(query as a web services) and build your queries on universe.
You get an option of hardcoding the user id and password in the data connection for QAAWS which will not asks the users for login credentials.
This will hepl the user to veiw the latest data from the database and the user wont be asked for login too.
Thanks,
Amit. -
Unable to plot 1-D array with a cluster of 2 elements on an XY graph
I'm Unable to plot a 1-D array with a cluster of 2 elements on an XY graph. The data appears at the input to the graph but nothing is plotted. I'm trying to plot a line connecting each point generated.
Solved!
Go to Solution.
Attachments:
TEST11.vi 13 KBChuck,
0. Do not post VIs with infinite loops! Change the True constant to a control. One of the regular participants on these Forums has commented that using the Abort button to stop a VI is like using a tree to stop a car. It works, but may have undesired consequences!
1. Use a shift register on the For loop also.
2. Inserting into an empty array leaves you with an empty array. Initialize the array outside the loop to a size greater or equal to the maximum size you will be using. Then use Replace Array Subest inside the loop.
3. Just make an array of the cluster of points. No need for the extra cluster.
Lynn
Attachments:
TEST11.2.vi 11 KB -
Array to Cluster, Automate cluster size?
I often use the Array to Cluster VI to quickly change an array of data into a cluster of data that I can then connect to a Waveform Chart. Sometimes the number of plots can be different which results in extra plots (full of zeros) on the graph, or missing plots if the array is larger than the current cluster size. I know I can right-click on the node and set the cluster size (up to 256) manually. I could also use a case structure with as many Array to Cluster nodes as I need, set them individually and wire an Array Size to the case structure selector but that's kind of a PITA.
My question is whether or not anyone knows a way to control the cluster size value programatically. It seems that if I can right-click it and do it manually there must be some way to automate it but I sure can't figure it out. It would be nice if you could simply wire your desired value right into an optional input on the node itself. Any ideas will be much appreciated.
Using LabVIEW: 7.1.1, 8.5.1 & 2013
Solved!
Go to Solution.I'm under the impression it's impossible. See this idea for related discussion.
Tim Elsey
LabVIEW 2010, 2012
Certified LabVIEW Architect -
Replace an array into the array of cluster!! Possible?
Hello,
I got a problem with inserting an array I acquired from another vi into the existing array of cluster. My big array contains a cluster of 5 elements (name, value, save, active and position. I want to connect my sub vi ,whose output is an array of number, to the main vi by replacing only the values in the main array. So all values in the main array are acquired from the sub vi but the remaining data stays the same. I also want my main array to look the same too, except the values have changed. I know it sounds quite simple but I don't really know it.
Thanks in advance
Solved!
Go to Solution.
Attachments:
vi connection.vi 12 KB
Data_Read (adapted).vi 32 KBI guess you need something like this. This will replace the values present in the main array with the values obtained from the sub vi.
Good luck
The best solution is the one you find it by yourself
Attachments:
vi connection.vi 8 KB
Data_Read (adapted).vi 26 KB -
Need help with connecting file inputs to arrays
In this assignment I have a program that will do the following: display a list of names inputed by the user in reverse order, display any names that begin with M or m, and display any names with 5 or more letters. This is all done with arrays.
That was the fun part. The next part requires me to take the names from a Notepad file, them through the arrays and then output them to a second Notepad file.
Here is the original program: (view in full screen so that the code doesn't get jumbled)
import java.io.*; //Imports the Java library
class progB //Defines class
public static void main (String[] arguments) throws IOException
BufferedReader keyboard; //<-
InputStreamReader reader; // Allows the program to
reader = new InputStreamReader (System.in); // read the the keyboard
keyboard = new BufferedReader (reader); //<-
String name; //Assigns the name variable which will be parsed into...
int newnames; //...the integer variable for the amount of names.
int order = 0; //The integer variable that will be used to set the array size
String[] array; //Dynamic array (empty)
System.out.println (" How many names do you want to input?"); //This will get the number that will later define the array
name = keyboard.readLine ();
newnames = Integer.parseInt (name); // Converts the String into the Integer variable
array = new String [newnames]; //This defines the size of the array
DataInput Imp = new DataInputStream (System.in); //Allows data to be input into the array
String temp;
int length; //Defines the length of the array for a loop later on
for (order = 0 ; order < newnames ; order++) //<-
{ // Takes the inputed names and
System.out.println (" Please input name "); // gives them a number according to
temp = keyboard.readLine (); // the order they were inputed in
array [order] = temp; //<-
for (order = newnames - 1 ; order >= 0 ; order--) //<-
{ // Outputs the names in the reverse
System.out.print (" \n "); // order that they were inputed
System.out.println (" Name " + order + " is " + array [order]); //<-
for (order = 0 ; order < newnames ; order++) //<-
if (array [order].startsWith ("M") || array [order].startsWith ("m")) // Finds and outputs any and all
{ // names that begin with M or m
System.out.print (" \n "); //
System.out.println (array [order] + (" starts with M or m")); //
} //<-
for (order = 0 ; order < newnames ; order++) //<-
length = array [order].length (); //
if (length >= 5) // Finds and outputs names
{ // with 5 or more letters
System.out.print (" \n "); //
System.out.println ("Name " + array [order] + " have 5 or more letters "); //<-
}The notepad file contains the following names:
jim
laruie
tim
timothy
manny
joseph
matty
amanda
I have tried various methods but the one thing that really gets me is the fact that i can't find a way to connect the names to the arrays. Opening the file with FileInputStream is easy enough but using the names and then outputing them is quite hard. (unless i'm thinking too hard and there really is a simple method)By "connect", do you just mean you want to put the names into an array?
array[0] = "jim"
array[1] = "laruie"
and so on?
That shouldn't be difficult at all, provided you know how to open a file for reading, and how to read a line of text from it. You can just read the line of text, put it in the array position you want, until the file is exhausted. Then open a file for writing, loop through the array, and write a line.
What part of all that do you need help with? -
Hello,
i'm using array of cluster to allow user entering differents setting
But in some case i would like to adapt viewing to hide some parameters or displaying 0 or a null field
my problem is when creating a ref on control in the list how to know wich line is concerned to modify the good one
here a vi for example
when case 1 is seleced in first column other ctl can be any of choices
when case 2 is selected i would like the mofify two others to be 0 and none
is there an other way than playing with coordonate and size of elements to know which line is the current one ?
Regards
Tinnitus
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte
Solved!
Go to Solution.
Attachments:
list of ctl.vi 8 KBI was able to simplify that VI to the point where I can post the code to demonstrate the idea. Here it is in both 8.6 and 9 (it seems to have lost some font formatting when saving back to 8.6). I haven't used XControls at all but it seems like the sort of thing that could be converted to one easily if I had the time and need for it.
Attachments:
Array of Clusters in Table.vi 52 KB
Array of Clusters in Table 8.6.vi 33 KB -
Array of Cluster with event structure
Hi,
I am having Array of cluster with cluster having 1 String Control , 1 Combo box, 1 Led control and 2 Numeric control. In the combo box i am having two options to select ('Binary' and 'PWM').Whenever Binary is selected then Led control has be enabled and whenever PWM is selected 2 Numeric control has to be enabled.
Is there any way to do this??
Pleas help me...
Regards
Meenatchiactually in my application, the front panel has to have 16 rows of controls (1 string control, 1 combo box, 1 Led control, 2 numeric control).so i planned to keep all those controls in a cluster and create one array.If i didnt so i will have 16x5 controls in my front panel and i have to put 16 event cases for each combo box to do the enable and disable of controls..
is there any simple way to do this..i have attached my front panel view
Attachments:
Untitled10.vi 139 KB -
I have an array of clusters that I'd like to change the color of each cluster programatically. I've attached the cluster hoping for some help. I'd also like to be able to disable some clusters while enabling others. Is this possible? is there a better way to do what i want?
Attachments:
Untitled 1.vi 9 KBHi Joe,
There is a way for you to change the color or disable a control programmatically, but like Darin said, you wouldn't be able to do this per element through an array. I urge you to go with his recommendation of using a cluster of clusters.
With regards to the necessary programming, a property node should do the job.
Best Regards,
Joshua de la Llana
Applications Engineer
NI ASEAN
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