Initialize array from a constant string

I generated the coefficients for a FIR filter in Mathscript (250 taps). I dumped the values to a data file and then "load"ed them into a Mathscript box inside my vi.
This worked well until I created an executable version of my program (no Mathscript) where my coefficient vectors now come up Null.
My idea is to text copy the coefficients into a string constant in my vi, and then initialize my array as part of my start-up routines.
I was wondering if anyone has done this? Is such a routine available anywhere?
Thanks,
Tom J

How are you building the path the file that you are reading?
When you build an executable, the path of the VIs it contains changes.
In development environment, path to VI = c:\project\Top Level.vi
In executable environment, path to VI = c:\project\Executable.exe\Top Level.vi
So if the file you are reading is in the same directory as the executable, and you are building a path relative to that, you need to strip one more path level for the executable.
The above image shows one way to do determine programmatically if you are in the development or executable environment and how to strip the path an extra time for the RTE.
If this is not the problem, kindly ignore everything I just rambled on about.
Ed
Message Edited by Ed Dickens on 02-22-2007 10:36 AM
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.
Attachments:
Strip Path RTE.gif ‏4 KB

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Removing array from memory

I have an 2Darray (typically of ~ 1000 elements) that stores data to plot.
I did : Data Operations > Empty Array & then Data Operations > Make Current Value Default.
Sometimes, I need to re-calculate a new array of values, so I use the Invoke Node > Reinitialize to Default.
It doesn't seem to clear the values from the array. Restarting the
entire VI doesn't empty the array - only restarting LabView does.
Any ideas why this is happening ?
Thanks,
ak

Hi ak,
The best way is to use "Initialize Array" from the array palette. You have to wire an element to define the array type. If you know the array size, you can wire it, if you don't know it, you have to append new data to your array with "Build Array" function (also in the array palette). Build array is a resizable function.
Nevertheless it is better to fix the array size once for all because if the array size is getting too big, labview allocate entire new space for it.
Cheers.
Doc-Doc
http://www.machinevision.ch
http://visionindustrielle.ch
Please take time to rate this answer
Attachments:
init and build array example.vi ‏7 KB

Append a constant string to every element in an array

Hi Friend,
I have a small stuck in my labview program that is I need to append a constant string to each element of an array. Could someone provide guidance on this? Prior thanks to your help.
Have a nice day!
Lee Joon

Pass the array into a for loop with autoindexing; concatenate each element with the constant and then use the array output from the loop...
I was a few seconds behind the post above; great minds think alike!
Message Edited by Phillip Brooks on 11-15-2007 08:42 AM
Now is the right time to use %^<%Y-%m-%dT%H:%M:%S%3uZ>T
If you don't hate time zones, you're not a real programmer.
"You are what you don't automate"
Inplaceness is synonymous with insidiousness
Attachments:
Append String.gif ‏33 KB

Passing values to form bean string array from dynamic added textboxes

Hi,
I am unable to pass values to form bean string array from a jsp in which I have incorporated dynamically adding of textboxes in javascript.
I have given add/delete row option in the jsp. If there is single row, this is working fine. But after adding a row, I am not able to either do any validations on added textboxes or pass the values to the String array form bean variable.
code snippet:
var cell6 = row.insertCell(4);
var element5 = document.createElement("input");
element5.type = "text";
element5.className = "formtext1";
element5.size = "5";
element5.value = "00.00";
element5.name= "qty"; // this is a string array of the form bean.
element5.onchange=function() {checkNumeric(this);};
cell6.appendChild(element5);
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form bean declaration
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Edited by: j2eefresher on Jan 12, 2010 11:23 PM

Shivanand,
There's no need to post that much code when you could create a very short test case that demonstrates only the problem you are having.
You're using &NAME. notation on something that isn't a page or application item. You can't reference PL/SQL variables that way (or any other way) outside the PL/SQL scope. For your situation, you could create a page item named P55_DOCID and assign it a value in the PL/SQL process (:P55_DOCID := DOCID;), then reference &P55_DOCID. in HTML areas like the success message.
Scott

Initialize array vs array constant

j'ai besoin d'un tableau initialisé.
de ces 2 options:
- la fonction initialize array
- une constante tableau
quelle est la meilleure ? ... et surtout pourquoi.
en terme de performance, de gestion mémoire (ou autres paramètres)
Je me doute que si la fonction "initialize array" a été créée ... il y a sans aucun doute une raison
mais quelle est-elle ? ... par rapport à l'utilisation d'une "constante tableau".
merci à tous.
edit:
la fonction "initialize array" permet (en effet) de fixer dynamiquement la taille,
serait-ce le "pourquoi" de son existence ?

perso, j'utilise assez fréquemment la fonction "initialize array" dans les cas où je connais (à l'avance) la taille de mon tableau,
ou plus précisément ... quand je connais la taille "maximum" de mon tableau.
J'utilise toujours "initialize array" conjointement avec les fonctions "replace array subset" et "reshape array".
comme ceci par exemple :
je préfère de loin cette méthode plutôt que d'utiliser la fonction "build array" ... ou un tunnel d'indexation.
C'est un peu plus de code, mais LV connait la taille du tableau dès la compilation ... et ça, c'est plus de vitesse.
De plus ... (je n'ai pas vérifié) ... j'ai lu que le tunnel d'indexation était "relativement" lent. (et encore d'avantange avec le tunnel indexé conditionnel)
Je ne fais pas d'acquisition, mais je pense que ce système n'est pas incompatible avec un code d'acquisition.
Un acquisition se passe pendant un temps "fini", on connait (en principe) la fréquence d'échantillonnage,
je ne vois donc pas d'interdiction de "prévoir" dès le début un tableau de taille connue.
Mais ... je ne suis pas un spécialiste de l'acquisition.
initialiser un talbeau 2D d'une taille de 20*5 avec la valeur 0 doit prendre moins de mémoire que d' initialiser un tableau de la même taille avec la valeur 1000
là ... queneni ... initialiser un tableau x avec la valeur 0 ou 1000 occupe exactement le même espace mémoire.
Les données se trouvent sur 32bits ... et notre mémoire centrale se moque de savoir si la valeur mémorisée est x ou y ... c'est toujours 32bits.
1000 x U32, c'est 1000 x (4 octets) = 4000 octets dans tous les cas.
Pour conclure, je dirais que la fonction "initialiser un tableau" ne sert qu'aux cas particuliers où l'on doit donner la même valeur pour un tableau
avis pertinent.
perso, je dirai que "initialize array" est utile quand on connait à l'avance la taille ou la taille maximum d'un tableau.
mais ta vue des choses est intéressante.
merci Kaleck0 pour ton intervention.
Les discussions "de fond" sont toujours très intéressantes.

Example of passing String Array from java to C using JNI

hi all
i searched net for passing string array from java to C but i dont get anything relevent
i have
class stu
int rollno
string name
String [] sub
i want to pass all as String array from java to C and access it C side

1. Code it as though it were being passed to another method written in java.
2. Redefine the method implementation to say "native".
3. Run jnih to generate a C ".h" file. You will see that the string array
is passed into C as a jobject, which can be cast to a JNI array.
4. Write the C code to implement the method and meet the interface
in the generated .h file.

How to output last 4 arrays from a For Loop?

Hi People,
I am almost at the end of my tether. I really hope someone could please help me.
Any input would be welcome. VI attached.
VI explanation:
I initialize an array.
The random number generator simulates my camera input.
Depending on which iteration it is, the data is added into one of four output arrays.
'x-y*floor(x/y)' gives a remainder value of 0, 1, 2 or 3.
'Case Selector' just adds 1 to 'x-y*floor(x/y)' to get case 1, 2, 3 or 4.
Shots 1, 5, 9 etc are added to Array 1 (Case 1).
Shots 2, 6, 10 etc are added to Array 2 (Case 2).
Shots 3, 7, 11 etc are added to Array 3 (Case 3).
Shots 4, 8, 12 etc are added to Array 4 (Case 4).
Averaged Output displays the averaged value i.e. the total value divided by the number of shots saved in that array ('Set (IQ+1)').
My problems are:
1) I would like to output only the last 4 sets of data from the Averaged Output 1, 2, 3 and 4 to 4 different files (i.e. save as .csv what is displayed onscreen in indicators 'Averaged Output 1', 2, 3 and 4 at the end of all iterations.
Where should I place my file save diagram disable so that it does this?
Putting it outside the main For Loop with auto-indexing on gives me one file with all previous data. (This is not feasible as my number of shots should number in the thousands)
Putting it outside the main For Loop with auto-indexing off gives me only the last set of data. (I need the output for 4 Arrays, not just the last run)
Putting it inside the main For Loop (as shown) gives me the same number of files as number of iterations. (Again not feasible due to large number of files that will be generated and slow camera capture)
For the sake of fast camera capture, I would like these 4 files to only output once all the image captures are complete.
2) Would preferably like to name the file once and for the programme to append '(1)', '(2)', '(3)' and '(4)' to filename of the appropriate 'Averaged Output' Arrays but file path controls are another big headache for me.
3) P.s. is initializing one array enough to avoid using Memory Manager? Or should I initialize 4 arrays?
I am using Labview 2010.
Thanks so much,
Jaslyn
Solved!
Go to Solution.
Attachments:
Help Understanding Arrays and file paths (10).vi ‏26 KB

Thanks so much Lennard!!
Hi JKSH,
I've been busy trying to complete the dang code, but for completeness so that other users can learn too, I shall answer your queries. Thanks for looking in.
First, what do you mean by "add"? Your code in your case strcuture sums your input values, so your array size doesn't change. However, you also said "Putting it outside the main For Loop with auto-indexing on gives me one file with all previous data. (This is not feasible as my number of shots should number in the thousands)" -- it sounds like you are expecting an array with thousands of elements. So, what should "Output Array N" look like?
Ans: Output Array N should be a 4x4 array of the summation of all the numbers generated during every 4th iteration.
i.e. if random number 1=1, random number 2=2, etc, And 'No of iterations' is 12,
Output Array 1 should be 1+5+9:
15 15 15 15
15 15 15 15
15 15 15 15
15 15 15 15
(Note: Most of your arrays are 4x4, but in Case #2 you created 128x128. I prersume this is a typo?)
Ans: Kind of, I'm using a 4x4 array of randomly generated numbers as an example but my actual data will be the 128x128 pixel output of a camera. And during actual experimentation, 'No of Iterations' will number in the thousands.
Second, why do you add your "simulated camera input" to the "Initialized Array"? You can add it direcly to the previous output inside your case structure.
Ans: See answer to question 3
Third, have a look at shift registers: http://www.ni.com/gettingstarted/labviewbasics/shiftregisters.htm. Use them instead of Feedback Nodes to make your code tidier.
Ans: I did try.. But I can't seem to add shift registers to the case structure, only the for loops outside. Are you sure it can be done..?
jaslyn wrote:
1) I would like to output only the last 4 sets of data from the Averaged Output 1, 2, 3 and 4 to 4 different files (i.e. save as .csv what is displayed onscreen in indicators 'Averaged Output 1', 2, 3 and 4 at the end of all iterations.
Where should I place my file save diagram disable so that it does this?
For the sake of fast camera capture, I would like these 4 files to only output once all the image captures are complete.
You will need to call "Write to Text File.vi" 4 times to write 4 files. So, you should finish your loop, then call this VI 4 times.
Ans: How do I get it to extract the data from each of the 4 cases in my case structure?
jaslyn wrote:
2) Would preferably like to name the file once and for the programme to append '(1)', '(2)', '(3)' and '(4)' to filename of the appropriate 'Averaged Output' Arrays but file path controls are another big headache for me.
You can create strings first, then convert them into paths: http://zone.ni.com/reference/en-XX/help/371361G-01/glang/string_to_path/
Thanks
jaslyn wrote:
3) P.s. is initializing one array enough to avoid using Memory Manager? Or should I initialize 4 arrays?
I'm not sure what you're asking; can you please clarify what you mean by "avoid using Memory Manager"? But anyway, you've actually initialized FIVE arrays: 1 outside the loop, and 1 inside each case.
I've read that to avoid fluctuations in memory usage, it is a good idea to initialize arrays to their expected size before the start of data collection. That was just what I was trying to do.

Adding data to array from an empty query

I am trying to add data to an array from a database query, however some queries will return no data (empty set). In that case I would like to add fake data so that the index size matches my other array (assetsid).
Thank you for your time.
     int f2a=0;
     String[] exportedtime;
     String[] exportedtime_formated;
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     ArrayList exportedtime_formated_ar = new ArrayList(f2a);
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               f2a=f2a+1;
               exportedtime = new String[f2a+1];
               exportedtime_formated = new String[f2a+1];
               exportedtime[f2a]=fuel2a_myResultSet.getString("exportedtime");
               exportedtime_formated[f2a]=fuel2a_myResultSet.getString("exportedtime_formated");
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I'd be curious to know if it would be possible to rewrite your query using a JOIN so you could get all the data in one query. The way you've written it will require N network round trips, where N is the number of engine serial numbers. I wonder if clever application of a JOIN with a GROUP BY would do the trick in one?
I don't care for the formatting stuff you're doing, either. There's no need to ask the database for that. Bring the dates over and handle the formatting in Java using java.text.SimpleDateFormat. Less work for the database AND it won't be so tied to Oracle, since you won't need that TO_CHAR function anymore.
I'd give clients the raw java.sql.Date and let them worry about formatting it the way they wish. That's not a persistence concern.
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How to call a CString array from TestStand

I have a C++ DLL that uses a CString array, CString myString[ ], that I need to pass back to TestStand 4.0 for inclusion in my results database.
In the TestStand module definition the parameter argument Description comes up as a CStriing pointer (CString*) instead of a CStringArray.
When I put my array of strings into the Value Expression I get an error: Expected String, found Array of Strings.
I have no trouble passing just a string pointer but that's not working either.
Can someone help?
Thanks,
Steve S

Hi Steve,
I don't think that you can pass a CString Array from C++ DLL to TestStand 4.0 directly.
But you can do it another way: concatenate all Strings by a delimit in your CString Array to build a new String, then pass it to TestStand. In TestStand you can separate those Strings by the delimit, and rebuild a String Array.
For example:
// If this is your CString Array.
CString myString[] = {"AAA", "BBB", "CCC"};
// Build a new String in your C++, and pass it to TestStand.
char *myNewString = "AAA~BBB~CCC";
// Separate myNewString and build an Array in TestStand...
Hope that can help you!
Message Edited by My NI on 11-29-2007 11:34 AM
Regards
MY

Passing an array from Java to Pl/SQL Procdures

I am relatively new to the Java world and I am unable to pass back an array from Java back to the calling PL/SQL procedure. I have read many of the posts that deal with this issue and in specificly have viewed Ask Tom. My main issue is trying to get the data types matched up. I am able to return varchar2, numbers, and the like, but an array of filenames is not happening. I have tried a variety of "types" but unable to accomplish the task. Please help.
I have my Java class basically defined as:
public static oracle.sql.ARRAY[] getCollection(String directory)
throws SQLException
{ // provide a directory and get a listing of files
File path = new File( directory );
String[] list = path.list();
return list;
SQL Type and PL/SQL Procedure is:
CREATE OR REPLACE TYPE PTO_FILE IS TABLE OF VARCHAR2(100);
create or replace function get_dir_collection( p_directory in varchar2 ) RETURN PTO_FILE
as language java
name 'DirCollection.getCollection( java.lang.String ) return oracle.sql.ARRAY[]';
/

I know that it is not an ARRAY. It is however an "array" and I am attempting to map Java's String[][ to some "object" on the oracle side. I have looked at the link you sited and was not able to find the data mapping. I have found that mapping data types between different "languages" is some of the most difficult aspects of working with multiple languages.
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Reading in an array from a text file

I'm trying to use a text file to load in some configuratin
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needs to be in an array. Can someone please point me in the right
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the easiest way is to create a string with the (soon-to-be)
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Calling an array from another class

Ok I have this little program that I created to display values stored in an array. Well, I want my array to automatically be populated with the same values that are in another array that resides in a different class. Here is my code for the class that I want the values to be displayed:
import javax.swing.*;
import java.awt.*;
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     MemicCSVReader[] interestObjectArray = new MemicCSVReader[3];
     interestObjectArray[0] = new MemicCSVReader();
     interestObjectArray[1] = new MemicCSVReader();
     interestObjectArray[2] = new MemicCSVReader():
     for(int x = 0; x < 3; x++)
     JPanel display = new JPanel();
     JTextField interestText = new JTextField(10);
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     JTextField interestText2 = new JTextField(10);
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     JTextField interestText3 = new JTextField(10);
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          super("Test");
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          setVisible(true);
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          display.add(interestText);
          interestText.setText(interest[0]);
          interestText.setEditable(false);
          pane.add(display);
          display2.setLayout(config2);
          display2.add(interestText2);
          interestText2.setText(interest[1]);
          interestText2.setEditable(false);
          pane.add(display2);
          display3.setLayout(config2);
          display3.add(interestText3);
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          interestText3.setEditable(false);
          pane.add(display3);
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     public static void main(String[] args)
          GUIRead run = new GUIRead();
Here is my code that I want the double[] interest array to pull it's data from:
public class MemicCSVReader
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     MemicCSVReader()
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          for(int x = 0; x < 3; x++)
               interestArray[x] = Double.parseDouble(interestString[x]);
}

Ok, thanks for your help. Now I have another problem. I can't get the values to display. Here is my code:
This is the program that runs the application:
import javax.swing.*;
import java.awt.*;
public class GUIRead extends JFrame
     MemicCSVReader readCSV = new MemicCSVReader();
     double[] interestDouble = readCSV.getInterestArray();
     String[] interest;
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          setVisible(true);
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          FlowLayout config2 = new FlowLayout(FlowLayout.LEFT,10,10);
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          pane.setLayout(config2);
          display.setLayout(config2);
          display.add(interestText);
          interestText.setEditable(false);
          pane.add(display);
          display2.setLayout(config2);
          display2.add(interestText2);
          interestText2.setEditable(false);
          pane.add(display2);
          display3.setLayout(config2);
          display3.add(interestText3);
          interestText3.setEditable(false);
          pane.add(display3);
          setContentPane(pane);
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          for(int x = 0; x < 3; x++)
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          interestText.setText(interest[0]);
          interestText2.setText(interest[1]);
          interestText3.setText(interest[2]);
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This is the file that it pulls the array from:
public class MemicCSVReader
     private double[] InterestArray = new double[3];
     MemicCSVReader()
          double[] InterestArray = {5.5,5.35,5.75};
     public double[] getInterestArray()
          return InterestArray;
}

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hi all,
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what should i do if i want to keep this column a const string like "abc"? How to write the map expression?
Setting a default value like "abc" of this column in database is not available .
please try to help, thanks a lot.
jun

Hi jun,
You mean, u want to give some hard coded value to a specific column in mapping?
If so , give 'abc' in the target column and execute it on Target.
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Guru

Displaying array from another method

Hello for this code I want to display the array from the first method in the second method although when I run it, it displays 6 times the whole array - well the the last iteration shows the whole array. I have only just started using different methods.
Please could someone say why this is happening.
Cheers
John
import java.util.*;
public class Lottery
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Well I know your right but actualy getting this to work for my program is proving hard. This is my progress so far:
Cheers
John
public static void main(String[] argStrings)
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          int p = 0;
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Hoi all,
I am using MyEclipse Tomcat 4.1 and MySql
I am trying to pass a 2D array from my struts framework action class to the forwarding action JSP.
the Array is filled correctly, I check that by printing the values of the array as they are filled by my ResultSet into my console.
but when I pass the Array to my JSP the value is null.
I did the following in the class:
request.setAttribute("Aray",aray); and in the JSP i request the Attrebute as follows:
String[][] ary = request.getParameter("Aray"); Any help will be appreciated thx .

request.setAttribute("Aray",aray);
String[][] ary = request.getParameter("Aray");
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Initialize array from a constant string

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