1D Array for Data to buffer

I have a force plate that sends out forces in the x,y,z and i need to be able to index them into a 1D array for a buffer. I think i have the ground work of the program laid out but im not sure where to go from here. See attached program. Thanks for any possible help.
Attachments:
Buffer.vi ‏20 KB

Your VI will run forever because you have a False constant wired to the stop terminal of the loop.
Why do you have a while loop in there anyway?
You don't have any element going into your replace array subset. So you have a broken arrow.
I don't understand the meaning of your buffer full boolean. It really isn't telling whether your buffer is full or not. It doesn't even track how many times you've replaced various elements in the array. It just checks whether the value you used for index is a multiple of your buffer size. Let's say yor buffer size is 10. If you use an index 9, the remainder of 9 mod 10 is 9, it's not equal to 0, so the boolean is false. Okay.
Now if your index is 10, 10 mod 10 is 0, it's equal to 0, so the boolean is true. Okay.
Now if your index is 11 (obviously bigger than 10) 11 mod 10 is 1. It's not equal to 0, so the boolean is back to false. But is seems like you really intend for it to be true.
You aren't really ever checking if your array is "full". You are just comparing your entered index to your "buffer size" input, which may not actually have anything to do with the size of the array.

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Most efficient way to pack U16 -- U32 Array for Data DMA Transfer?

I have an RT controller that wants to send down data to an FPGA using DMA. In LabVIEW 8.2, I have no choice but to pass down U32 blocks of data however my my input data is a U16 array. This leaves me two choices: 1) Wire the U16 Array directly to the DMA node which will coarse it to U32 but I'm wasting 16bit*#of elements 2) Pack the U16 array into a U32 Array prior to sending it down. I would like to do #2 and I have a method that works (and seems to be pretty efficient) but I have a feeling I am doing it the hard way (or roundabout way). Is their a simpler (but just as efficient) way to do this procedure? Thanks
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Go to Solution.
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SiegeX wrote:
... unfortunately I forgot to mention that byte order does matter and odd # of inputs are allowed.
See, that something that does not make full sense here, because you end up with a mixed byte order, because the 16bit halves are still big endian. What's at the "other" end, exactly?
Anyway, here's a slight simplification of the previous code. (The typecast is better if we can do it all big endian and omit the "decomate/interleave" dance.)
(You could also flatten to a string and back. This has the advantage that byte order is a direct option. I don't know how that is, performance wise.))
Message Edited by altenbach on 11-12-2008 04:31 PM
LabVIEW Champion . Do more with less code and in less time .
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Searching 1D array for data present in lookup 1D array.

Hi!,
I have a sorted 1D array of strings(say initial array) and I have
three lookup array of string(say array A, array B and array C). I want
to search the initial array with array A, array B and array C and then
create a new array Final which will contain the elements of array A,
if any, its start index and its last index and then element sof
arrayB, if any found, its start index and its end index and then
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The start index and end index are stored in different indicatrs for
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How do I search elements of 1D array with another 1D array?
TIA,
RK

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You will need three of these loops, one for each searching array. Or better, you could push it into a subVI and call it three times.
I hope that this helps!
Bob Young
Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
DISTek Integration, Inc. - NI Alliance Member
mailto:[email protected]

Select Multiple into array for data insertion

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You just need the square brackets, something like: <select name="vVol_id[]"
vVol_id will then be an array if items are selected.
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Read Video data from buffer or byte array

Hi guys,
I've developed a tx/rx module, the tx read an mpg file and transfer it over network. rx has the data in a byte array, I also feed the byte array to a media buffer. Now my question is how to creat the player and feed the player to play the content of the buffer or byte array?
I would really appreaciate if someone could help me please...
Thanx
I haven't and didn't want to use any of the RTP stuff...

Hi, I tried PullBufferDataSource. What I am trying to do is : read a .wav file into a queue, then construct a datasource with this queue. The processor will be contructed to process the datasource, and a datasink to sink data to a file. I think if this workflow could work, it should work in network transmission.
In fact the code works partially. The trick part is the read( Buffer ) method. If I try to use 'if' statement to see if Queue has empty or not, the datasink could not format the head part of output file correctly. If I didnot use 'if' statement, the program will terminate when exception occurs. The output file is all right.
I did not understand what is going on.
Note: the original file is a RAW data file without format info.
Here is the code fragments. Hopefully we can work together to figure it out.
Thanks.
Jim
* QueueDataSourceTester.java
* Created on November 11, 2002, 10:29 AM
package bonephone;
import javax.media.*;
import javax.media.control.*;
import javax.media.protocol.*;
import javax.media.datasink.*;
import javax.media.format.AudioFormat;
import java.util.LinkedList;
import java.io.*;
* @author wguo
public class QueueDataSourceTester implements ControllerListener, DataSinkListener {
protected LinkedList myQueue;
/** Creates a new instance of QueueDataSourceTester */
public QueueDataSourceTester() {
myQueue = new LinkedList();
public void testIt( ){
// Read a file into a Queue
FileInputStream inputStream = null;
try{
inputStream = new FileInputStream( "c:/media/phone.wav");
catch( IOException ioe ){
System.err.println( "Error on open media file." );
try{
byte data[] = new byte[1024];
int n ;
while( ( n = inputStream.read( data, 0, 1024 )) != -1 ){
myQueue.addLast( data );
data = new byte[1024];
inputStream.close();
catch( IOException ioe ){
System.err.println( "Error on reading file." );
System.out.println( "Queue Size: " + myQueue.size() );
System.out.println( "myQueue = " + myQueue.size() );
QueueDataSource dataSource = new QueueDataSource( myQueue );
Processor p = null ;
try{
System.out.println( "Create processor for QueueDataSource ... " );
p = Manager.createProcessor( dataSource );
catch( Exception e ){
System.err.println( "Cannot create a processor for the QueueDataSource. " );
System.out.println( "\nProcessor is created." );
p.addControllerListener( this );
p.configure();
if( !waitForState( p, p.Configured ) ) {
System.err.println( "Failed to configure the processor." );
System.out.println( "\nProcessor is configured") ;
// p.setContentDescriptor( new ContentDescriptor( ContentDescriptor.RAW ) );
p.setContentDescriptor( new ContentDescriptor( FileTypeDescriptor.WAVE ) );
TrackControl tcs[] = p.getTrackControls();
Format f[] = tcs[0].getSupportedFormats();
if( f == null || f.length == 0 ){
System.err.println( "The mux does not support the input format : "+ tcs[0].getFormat() );
tcs[0].setFormat(
new AudioFormat( AudioFormat.ULAW,
8000,
8,
1,
Format.NOT_SPECIFIED,
AudioFormat.SIGNED,
8,
Format.NOT_SPECIFIED,
Format.byteArray ) );
//System.out.println( "Setting the track format to: " + f[4] );
p.realize();
if( !waitForState( p, p.Realized )){
System.err.println( "Failed to realize the processor" );
DataSink dsink;
MediaLocator outML = new MediaLocator("file:/c:/media/queue.wav" );
if( (dsink = createDataSink( p, outML )) == null ){
System.err.println( "Failed to create a datasink for given " +
"mediaLocator : " + outML );
dsink.addDataSinkListener( this );
System.out.println( "\nProcessor is realized" );
try{
p.start();
dsink.start();
catch( IOException ioe ){
System.err.println( "IO error during processing." );
waitForFileDone();
try{
dsink.close();
catch( Exception e ){
p.removeControllerListener( this );
System.err.println( "... done processing." );
DataSink createDataSink( Processor p, MediaLocator outML ){
DataSource ds ;
if( ( ds = p.getDataOutput() ) == null ) {
System.err.println( "Something is really wrong: the processor does" +
" not have an output DataSource. " );
return null;
System.out.println( "DataOutput: " + ds.getContentType() );
DataSink dsink;
try{
System.out.println( "- create DataSink for : " + outML );
dsink = Manager.createDataSink( ds, outML );
dsink.open();
catch( Exception e ){
System.err.println( "Cannot create the DataSink: " + e );
return null;
return dsink;
Object waitSync = new Object();
boolean stateTransitionOK = true;
boolean waitForState( Processor p, int state ){
synchronized( waitSync ){
try{
while( p.getState() < state && stateTransitionOK )
waitSync.wait();
catch( Exception e ){
return stateTransitionOK;
public void controllerUpdate(javax.media.ControllerEvent controllerEvent) {
if( controllerEvent instanceof ConfigureCompleteEvent ||
controllerEvent instanceof RealizeCompleteEvent ||
controllerEvent instanceof PrefetchCompleteEvent ){
synchronized( waitSync ){
stateTransitionOK = true;
waitSync.notifyAll();
} else if( controllerEvent instanceof ResourceUnavailableEvent ){
synchronized( waitSync ){
stateTransitionOK = false;
waitSync.notifyAll( );
public static void main( String args[] ){
QueueDataSourceTester tester = new QueueDataSourceTester();
tester.testIt();
Object waitFileSync = new Object();
boolean fileDone = false;
boolean fileSuccess = true;
boolean waitForFileDone(){
synchronized( waitFileSync ){
try{
waitFileSync.wait( 5000 );
catch( Exception e ){
System.err.println( "Error on waiting file to be done" );
return fileSuccess;
public void dataSinkUpdate(javax.media.datasink.DataSinkEvent dataSinkEvent) {
if( dataSinkEvent instanceof EndOfStreamEvent ){
synchronized( waitFileSync ){
fileDone = true;
waitFileSync.notifyAll();
else if ( dataSinkEvent instanceof DataSinkErrorEvent ){
synchronized( waitFileSync ){
fileDone = true;
fileSuccess = false;
waitFileSync.notifyAll();
// Inner Class
* A datasource that will read Media data from Queue.
* Inside queue individual RAW data packats are stored.
* @author wguo
public class QueueDataSource extends PullBufferDataSource{
protected QueueSourceStream streams[];
/** Creates a new instance of QueueDataSource */
public QueueDataSource( LinkedList source ) {
printDebug( "QueueDataSource: QueueDataSource( LinkedList) " );
streams = new QueueSourceStream[1];
streams[0] = new QueueSourceStream( source );
public void connect() throws java.io.IOException {
printDebug( "QueueDataSource: connect() " );
public void disconnect() {
printDebug( "QueueDataSource: disconnect()" );
public String getContentType() {
return ContentDescriptor.RAW;
public Object getControl(String str) {
printDebug( "QueueDataSource: getControl(String) " );
return null;
public Object[] getControls() {
printDebug( "QueueDataSource: getControls() " );
return new Object[0];
public javax.media.Time getDuration() {
return DURATION_UNKNOWN;
public javax.media.protocol.PullBufferStream[] getStreams() {
printDebug( "QueueDataSource: getStreams() " );
return streams;
public void start() throws java.io.IOException {
printDebug( "QueueDataSource:start()" );
public void stop() throws java.io.IOException {
printDebug( "QueueDataSource: stop() " );
private void printDebug( String methodInfo ){
System.out.println( methodInfo + " is called" );
// Inner Class
public class QueueSourceStream implements PullBufferStream{
LinkedList sourceQueue;
AudioFormat audioFormat;
boolean ended = false;
/** Creates a new instance of QueueSourceStream */
public QueueSourceStream( LinkedList sourceQueue ) {
printDebug( "QueueSourceStream: QueueSourceStream( LinkedList )" );
this.sourceQueue = sourceQueue;
audioFormat = new AudioFormat(
AudioFormat.ULAW,
8000,
8,
1,
Format.NOT_SPECIFIED,
AudioFormat.SIGNED,
8,
Format.NOT_SPECIFIED,
Format.byteArray);
public boolean endOfStream() {
printDebug( "QueueSourceStream: endOfStream()" );
return ended;
public javax.media.protocol.ContentDescriptor getContentDescriptor() {
printDebug( "QueueSourceStream: getContentDescriptor()" );
return new ContentDescriptor( ContentDescriptor.RAW) ;
public long getContentLength() {
printDebug( "QueueSourceStream:getContentLength()" );
return 0;
public Object getControl(String str) {
printDebug( "QueueSourceStream:getControl( String) " );
return null;
public Object[] getControls() {
printDebug( "QueueSourceStream:getControls()" );
return new Object[0];
public javax.media.Format getFormat() {
printDebug( "QueueSourceStream:getFormat()" );
return audioFormat;
public void read(javax.media.Buffer buffer) throws java.io.IOException {
buffer.setData( (byte[])sourceQueue.removeFirst() );
buffer.setOffset( 0 );
buffer.setLength( 1024 );
buffer.setFormat( audioFormat );
printDebug( "QueueSourceStream: read( Buffer ) " );
else {
buffer.setEOM( true );
buffer.setOffset( 0 );
buffer.setLength( 0 );
ended = true;
System.out.println( "Done reading byte array" );
return;
public boolean willReadBlock() {
printDebug( "QueueSourceStream: willReadBlock()" );
if( myQueue.isEmpty() )
return true;
else
return false;
private void printDebug( String methodInfo ){
System.out.println( methodInfo + " is called. " );

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Multiple Sound Card for data acquisition gives read buffer error

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thnx i hv solved that problem ... now there is another problem... i am getting all my signals in computer but problem comes when i use phase detector. it keep on showing different values in phase measurement block.. how can i manage the signal with correct phase. i cannt send code cz it has many VIs and they are spread in computer. so i am pasting come photos that are showing different. look in picture...it is from same signal and the phase is different..
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Post Processing array for moving average

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Attachments:
Tapered_Running_Average.vi ‏24 KB

Getting 2D array of data in tabular format using web services

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I was trying to fetch data from MS access database and populate the same 2D array of data on my web browser. But unfortunately it says that the 2D array is not a "supported data type" for web applications and hence the 'build fails'.
I would like to know if there is any method to represent my 2D data in a tabular format in my web broweser using the webservices. Needless to say, it can give such a good readiability!!!

ShoaibM wrote:
Hi vladodias!
I have implemented your solution and it works fine. :D Your solution would work as well, but it is bad in performance... See this...
http://docs.oracle.com/cd/E23943_01/core.1111/e10108/osb.htm#BABFHCDF
>
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>
And Why my forEach $index variable was not accessible inside the Insert Activity....??? What make you believe it wasn't accessible? I reckon you were just not doing the right xpath expression...
>
---how do you format your coding segment differently( background ) ...?? :)See the Forum FAQ bellow, search for "useful formatting options"
https://wikis.oracle.com/display/Forums/Forums+FAQ
Cheers,
Vlad
It is considered good etiquette to reward answerers with points (as "helpful" - 5 pts - or "correct" - 10pts)
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Well ..you code can be works for constant number of attributes in table .oopss here my requirement is table attributes not fixed ,we cant put constant number of place holder(? ) in a statement ,because those are not fixed ,
Let me explain here :
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How to extract data from Buffer and create a RTP stream

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camelstrike wrote:
Hi
I'm working on a project where I need to interrupt a media stream (video and audio) and extract the data. Send the data with a custom protocol. On the recieveing side I would like to reconstruct the stream using only the data chunks.
I'm currently looking at [DataSourceReader.java|http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/DataSourceReader.java] and more specifically at a method like printDataInfo(Buffer buffer) to extract the data.
There are a couple of different ways to get the data. Reading it from inside a DataSink is perfectly fine...
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[http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/CustomPayload.html]
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How can I use a 1 double array for this

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thanks
import java.text.NumberFormat;
import java.util.Locale;
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}

I would like to use one double array where I am using 2 single arrays, can this be done?It can, but why not write a Rate class or other data structure more suited to the purpose?

Error while assigning dates to associative array of date type

Hi All,
I am facing the issue while assigning dates to associative array of date type:
Oracle Version:
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
Stored procedure i am trying to write is as following
create or replace procedure jp1 (
p_start_date date default trunc(sysdate,'MM')
, p_end_date date default trunc(sysdate)
is
l_no_of_days number;
type t_date_id is table of date
index by pls_integer;
l_date_id_arr t_date_id;
begin
l_no_of_days := p_end_date - p_start_date;
for i in 0
.. l_no_of_days - 1
loop
    l_date_id_arr := p_start_date + i;
    dbms_output.put_line(p_start_date + i);
end loop;
end;
I am getting error at line 14 while compiling this. and the error message is as following:
Errors for PROCEDURE JP1:
LINE/COL ERROR
14/5     PL/SQL: Statement ignored
14/22    PLS-00382: expression is of wrong type
So while investigating this i tried to output the value of (p_start_date + i) using dbms_output.put_line and the output is date itself.
create or replace procedure jp1 (
p_start_date date default trunc(sysdate,'MM')
, p_end_date date default trunc(sysdate)
is
l_no_of_days number;
type t_date_id is table of date
index by pls_integer;
l_date_id_arr t_date_id;
begin
l_no_of_days := p_end_date - p_start_date;
for i in 0 .. l_no_of_days-1
loop
    --l_date_id_arr := p_start_date + i;
    dbms_output.put_line(p_start_date + i);
end loop;
end;
output of the
exec jp1
is as following:
01-DEC-13
02-DEC-13
03-DEC-13
04-DEC-13
05-DEC-13
06-DEC-13
07-DEC-13
08-DEC-13
09-DEC-13
10-DEC-13
11-DEC-13
12-DEC-13
13-DEC-13
14-DEC-13
15-DEC-13
16-DEC-13
17-DEC-13
18-DEC-13
I see the output as date itself. so why it is throwing error while assigning the same to associative array of date type.
I tried to google also for the same but to no avail.
Any help in this regard is appreciated or any pointer some other thread on internet or in this forum.
Thanks in advance
Jagdeep Sangwan

Read about associative arrays :
create or replace procedure jp1 (
p_start_date date default trunc(sysdate,'MM')
, p_end_date date default trunc(sysdate)
) is
l_no_of_days number;
type t_date_id is table of date
index by pls_integer;
l_date_id_arr t_date_id;
begin
l_no_of_days := p_end_date - p_start_date;
for i in 0..l_no_of_days - 1
loop
    l_date_id_arr(i) := p_start_date + i;
    dbms_output.put_line(p_start_date + i);
end loop;
end;
Ramin Hashimzade

Scripting: browse for data files in a folder and all subfolders below

Hello,
i'm looking for a command to search for data files (*.dat) in a folder and all subfolders below.
I checked out command DirListGet. This command only search in the declared folder and not in the subfolders below.
Anyone an idea?
I don't want to use a loop-structure for finding subfolders and browse for the data files.
Mr. Buddy

dim result : result = DirListGet("C:\tmp", "*.dat", "filename", "FullFilenamesRecursive")
dim fl : for each fl in result
MsgBox fl
Next
Works fine for me and even recursive.
Alternatively but with mucg more effort and the same result.
Option Explicit 'Forces the explicit declaration of all the variables in a script.
dim folderPath : folderPath = "C:\tmp"
dim files : files = GetFileListRecursive(folderPath)
dim fl : for each fl in files
MsgBox fl
Next
Function GetFileListRecursive(folderPath)
dim fso : Set fso = CreateObject("Scripting.FileSystemObject")
dim results : results = Array()
GetFiles fso, folderPath, results
GetFileListRecursive = results
End Function
Sub GetFiles(fso, folderPath, results)
dim folderObj : Set folderObj = fso.GetFolder(folderPath)
dim f : for Each f In folderObj.Files
if(0 = StrComp(fso.GetExtensionName(f), "dat", 1)) then
dim index : index = ubound(results) + 1
redim Preserve results(index)
results(index) = f.Path
End If
next
dim d : for Each d In folderObj.SubFolders
GetFiles fso, d.Path, results
next
End sub

1D Array for Data to buffer

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