Array into cluster

How do I input an array into the middle of a cluster?
Thanks

It does not really help if you keep repeating cryptic messages.
A cluster has no "middle"!
Why don't you attach a VI that has reasonable input values as control defaults and an indicator with the desired cluster, again containing the desired outcome as default value. This way we can easily see what you actually mean. Thanks!
LabVIEW Champion . Do more with less code and in less time .

Similar Messages

How do I convert a 1-D array of cluster of 5 elements into a 2-D array of numbers? (history data from a chart)

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

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 KB

I 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 a little help trying to convert an array into a cluster..

I'm having a difficulty converting the output of the AI Acquire Waveforms.vi from an array into a cluster. On my display panel I have a radial termperature gauge with two needles displaying the temperature of two different inputs. The input to this radial guage is of the cluster type, hence the need to convert.
Any help is appreciated. Heck even if there is a better way let me know.

The output of "AI Acquire Waveforms.vi" is an array of waveforms (waveform data type). You must first isolate the two elements of that array that correspond with the channels to which your temperature sensing devices are wired. If those are the only channels in your scan list, then the array should only be two elements in size. You can apply a shortcut if that is the case, but first the general solution.
1) Index the array of waveforms with an Index Array function found in the Array pallette. Stretch the Index Array function so that it gives you two inputs and outputs. Wire the index of the first and second temperature channels to the bottom inputs of the Index Array function. Wire the output of "AI Acquire Waveforms.vi" to the top input of the Ind
ex Array function. The outputs of the Index Array function are each a waveform for the corresponding channel you selected.
2) Get the "Y" waveform component for each channel. Use the Get Waveform Components function in the Waveform pallette. It looks alot like an unbundle function. Get two of those guys and wire then to each of your outputs from the Index Array function. Select "Y" for each Waveform component.
3) Average (or otherwise reduce) the acquired signals. The output of the "Y" component is an array of floats. You can wire that array up to an Average function to give you a scalar value. Do that for each output and now you just have two numbers.
4) Bundle your numbers. Use the bundle function.
5) Wire the bundle to your indicator.
Enjoy,
Daniel L. Press
www.primetest.com

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

Write array into txt file

Hi Guys!
I need a VI which writes the content of an array into a txt file.
I have an array like this:
Peti   Teri
Zoli   Hajni
Tomi   Heni
Pali   Robi
In the file the first line should be a full timestamp (date, time), and then would come the content of the array. The name of the file would also be a timestamp.
Thank you for your help in advance!

Hi Victronica and welcome to NI Forums!
If you have some custom data, then it is up to ou to tell excel how to interpret said data (what information to put where, etc.) A simple solution would be to flatten your cluster elements into strings, and write those strings into an excel sheet using ActiveX. An example on how to write a table of strings is available in the example finder, and I also have it attached here in LabVIEW 2013.
Kind regards:
Andrew Valko
National Instruments Hungary
Attachments:
Excel - Write Table.vi ‏17 KB

How do i change 2 row of array into waveform with delta time and time

Hello,
How do i change 2 row of array into waveform with delta time and time
so the waveform graph will display two waveform,
waveform, not cluster =]
and how to extract 1d array from waveform?

Hi AxE,
Here is an example VI, that do what You asked for.
Both requests.
Hope it Helps...
Attachments:
2D_to_Waveform.vi ‏75 KB

Dynamic array to cluster

During runtime my main VI is loading a data file that is dynamic in size and content (created by another VI). It is loaded as a 1D array. I am looking to convert this array into a cluster of elements and display the titles and values of each element. I'm pretty sure I can figure out the labeling but I can't get the conversion to work dynamically... Can anyone help??
Scott@P&E

If your problem is to associate a name/label to each numerical value from the 1D array, you should consider using a 2D string array. The first column could contain the names and the second column the values. A Table control could do the trick very nicely.
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

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 KB

Hi 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

How can I write a 1d array of cluster with 3 elements to a file?

Hi,
I have to make a "Power spectral densities" analyse from my waveform data. The results from this VI is an array of cluuster with 3 elemments. Now I want to write this array of cluster with 3 elements to a file. And later it must be able to use this file with EXCEL!!
thanks

Hello schloronzo,
make a for loop feeded with your array. Inside the for loop unbundle
the cluster, "format into string" the 3 values, adding the result to
the ones before and collect them in a shift register. Then save the
resulting string to a txt-file. If you make a good format string then
Excel is able to read your txt-file (use tab a separator and CR/LF
after each 3 values aka "csv format").
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Array to cluster with adjustable cluster size

Hi all
Here I have a dynamic 1D array and I need to convert it into cluster. So I use Array to Cluster function. But I notice that the cluster size is a fix value. How can I adjust the cluster size according to the 1D array size?
Anyone pls give advise..
Thanks....

I won't disagree with any of the previous posters, but would point out a conversion technique I just recently tried and found to work well for my own particular purposes. I've given the method a pretty good workout and not found any obvious flaws yet, but can't 100% guarantee the behavior in all settings.
Anyhow, I've got a fairly good sized project that includes quite a few similar but distinct clusters of booleans. Each has been turned into a typedef, complete with logical names for each cluster element. For some of the data processing I do, I need to iterate over each boolean element in a cluster, do some evaluations, and generate an output boolean cluster. I first structured the code to use the "Cluster to Array" primitive, then auto-index over the resulting array of booleans, perform the evaluations and auto-index an output array-of-booleans, then finally convert back using the "Array to Cluster" primitive. I, too, was kinda bothered by having to hardcode cluster sizes in there...
I found I could instead use the "Typecast" primitive to convert the output array back to my cluster. I simply fed the input cluster into the middle terminal to defin! the datatype. Then the output cluster is automatically the right size and right datatype.
This still is NOT an adjustable cluster size, but it had the following benefits:
1. If the size of my typedef'ed cluster changes during development by adding or removing boolean elements, none of the code breaks! I don't have to go searching through my code for all the "Array to Cluster" primitives, identifying the ones I need to inspect, and then manually changing the cluster size on them one at a time!
2. Some of my processing functions were quite similar to one another. This method allowed me to largely reuse code. I merely had to replace the input and output clusters with the appropriate new typedef. Again, no hardcoded cluster sizes hidden in "Array to Cluster" primitives, and no broken code.
Dunno if your situation is similar, but it gave me something similar to auto-sizing at programming time. (You should test the behavior when you feed arrays of the wrong size into the "Typecast" primitive. It worked for my app's needs, but you should make sure it's right for yours.)
-Kevin P.

Inserting a associative array into a table

Hi,
I am working on a process where I want to store the temporary results in an associative array. At the end of the process I plan to write the contents of the array into a table that has the same structure. (the array is defined as a %rowtype of the table)
Is it possible to execute ONE sql statement that transfers the array into the table? I am on 10g (10.2.0.4.0)
Here's what I have now:
declare
type t_emp is table of emp%rowtype index by pls_integer;
v_emp t_emp;
begin
-- a process that fills v_emp with lots of data
for i in v_emp.first .. v_emp.last
loop
    insert into emp values v_emp(i);
end loop;
end;But it would be better if the loop could be replaced by sql one statement that inserts all of v_emp into emp. Is that possible?
Thanks!
PS: I'm not sure whether it's a good idea to use this approach... building a table in memory and inserting it into the database at the end of the process. Maybe it's better to insert every record directly into the table... but in any case I'm curious to see if it is possible in theory :)
Edited: Added version info

True, SQL cannot access the PL/SQL type.
So you can not do something like this:
insert into emp
select * from table(v_emp)That is not possible.
But FORALL is possible:
FORALL i in v_emp.first .. v_emp.last
    insert into emp values v_emp(i);FORALL makes just one "round trip" to SQL bulk binding the entire contents of the array.
It is much more efficient than the normal FOR loop, though it is mostly a PL/SQL optimization - even the FORALL actually inserts the rows "one at the time", it just hands the entire array to the SQL engine in one go.
If the logic has to be done procedurally, FORALL is efficient.
If the logic can be changed so arrays can be avoided completely and everything done in a single "insert into ... select ..." statement, that is the most efficient.

How can i pass a value in array into .setText()?

i want to display a value in an array into a JTextField. May i know how to do it?
eg:
JTextField UserName;
UserName.setText(s);
but it doesn't display the value into the JTextfield.

ok... is s an array?
String[] s = {"s1", "s2"};Either you expect 1 value...
username.setText(s[0]);
// or
username.setText(s[1]);Or you expect both:
StringBuffer sb = new StringBuffer("");
for(int x = 0; x < s.length; x++) {
if(x != 0) sb.append(", ");
sb.append(s[x])
username.setText(sb.toString());

Add time stamp array into first column of text file

I am writing daq output to a file by using array to spreadsheet string vi then write that to a file but I would like to add a time stamp array into the first column of the text file. How do I do this?

When you use a DAQmx Read, you have the option of returning a waveform data type. This includes time data. If you were to use this and either Export Waveforms to Spreadsheet File or Write Measurement File, this would included. To stick with the regular Write to Spreadsheet File, you would have to create an array of timestamps yourself based on a start time and the sample rate of the DAQ. Then you would convert this and the data array to strings and use the string array type of Write to Spreadsheet instead of the DBL type.
Message Edited by Dennis Knutson on 09-25-2007 01:12 PM
Attachments:
Write to Spreadsheet - Strings.PNG ‏1 KB

Write arrays into a text file in different columns at different times

Hi,
I have a problem write data into a text file. I want to write 4 1D arrays into a text file. The problem is that I need to write it at different time and in different column (in other word, not only append the arrays).
Do you have an idea to solve my problem?
Thank you

A file is long a linear string of data (text). In order ro insert columns, you need to rewrite the entire file, because colums are interlaced over the entire lenght of the file.
So:
read file into 2D array
insert columns using array operations
write resulting 2D array to file again.
(Only if your colums are guaranteed to be fixed width AND you know the final number of colums, you could write the missing columns as spaces and then overwrite later. Still, it will be painful and inefficient, because column data are not adjacent in the file.)
LabVIEW Champion . Do more with less code and in less time .

Array into cluster

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