FP Read (Float Array -IO).vi request

Whenever I use the FieldPoint palette item under Input or Output I get a message asking for FP Read (Float Array -IO).vi and then FP Write (Float Array -IO).vi This vi is not present anywhere on my harddrive and a search of this website came up with nothing. The Fieldpoint palette item does not work properly when I choose Cancel - the input or output value becomes an integer (I think) that does not actually read or write data. What is this error, and how do I fix it?

The VIs that are missing should be in the ...LabVIEW\vi.lib\FieldPoint\Polymorphic Read.llb and ...LabVIEW\vi.lib\FieldPoint\Polymorphic Write.llb files. If you are missing them, it is likely that your installation has become corrupted. You can copy the above files from a different computer or re-install the NI-FieldPoint driver.
Regards,
Aaron

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How to make VIs as "Fp Read (Float Array -IO)" available to take a measurement?

I can't succeed in launching a fieldpoint VI cause I don't find the VI FP Read (Float Array -IO).vi. If I have well understood these VIs (like FP Open and other) are made available when installing the Field Point Server. In my case nothing occurs. What can I do?
thanks.

Hello,
If you have the FieldPoint drivers installed in the computer where you are opening this VI, then you should find the FP Read.VI on the functions palette of the Block Diagram (right click on any open space of the block diagram => All function => NI Measurements => FieldPoint)
If this VI that you can't find is actually a subVI that was made by the person that made the program, just save it from where it was developed and copy it on the new computer.
If this is unclear or if you have any more questions, please let me know.
Regards,
LA

Missing FP READ (Float Array-IO).vi & FP WRITE (Float Array-IO).vi

I am a complete newbie. I am trying to use the Field Point Express vi to collect data from some Field Point modules. When I go to past the Field Point Express VI into my sheet, the applications starts looking for a couple of sub-vi's. It is missing the FP Read (Float Array-IO).vi and the FP Write (Float Array-IO).vi. I am not sure if I erased these accidentally or what. Is there a way to replace these missing VIs?

These vi's are usually located in C:\Program Files\National Instruments\LabVIEW XX\vi.lib\FieldPoint\Polymorphic Read.llb. First, check if they are present and try to manually link them when the LV is trying to load them. Otherwise, you can try to uninstall your FP drivers and then perform a re-install. The FieldPoint drivers are located in your Device Drivers CD.
Hope this helps.

Fp20XX bombs on FP read (float) Array.vi RT 7.0

When trying to download an application into an FP 2010 with RT7.0, The download bombs out when trying to load the FP read (float) vi. The application runs fine locally.

The most common reason for an application to consistently fail to download (the particular VI may vary) is that the program is too large to fit in the memory space of the [c]FP-20XX module. If your program is borderline too large, you may try re-booting the [c]FP-20XX and downloading again (this will free up memory that may still be allocated from downloading and testing the program previously). If the program is still too large to download, you will need to either a) optimize your code to be more memory efficient or b) remove some of the code from the downloaded program and put it up on a client machine.
Regards,
Aaron

How to read binary file into a 2D float array??

Hi All,
I really need help to get this one as I am stuck and can't seem to find any way out of it. I am given a '.dat' file that has float values in it. I want to read this file in java and put it in a 2D float array. The file has basically a matrix of float values. What I want to do is to read this binary file and put all its data into 2D float array (float [] []) so that I can use it in my program. Is there a way to read file like this? I did find a similar matlab code (below) but cant seem to find anything in java and i really want to do this in java only.. I will appreciate ur help in this one.
thanks very much
Nitya
fid = fopen('datafile.dat');
A = fread(fid,[50 50],'float32');
fclose(fid);

I shud have shown the two ways that i Already tried. here they are..
first one using DataInputStream and then trying to readFloat()
DataInputStream dis = ....
Float f = dis.readFloat();This code gives code gives me some random values like this.. (i had a loop)
5.8758974E-14
-0.41055492
1.5724557E-30
1.06822824E14
-1.91934371E15
3.43829601E13
Other way i tried was this.. which seems right but here i have to convert byte to float and i thnk that code is giving some different results (slightly different float values) not sure why....may be my indexing of the array is wrong to make it a matrix.. or something else...
is.read(bytes, offset....);
int cnt = 0;
int j = 0;
for (int start = 0; start < offset; start = start + 4) {
if(j<50){
       myarray[cnt][j] = this.arr2float(bytes, start);
         System.out.println(cnt + "-" + j + " = " + myarray[cnt][j]);
       j++;
}else{
if(cnt < 50){
       cnt++;
       j = 0;
}else{
       break;
public float arr2float (byte[] arr, int start) {
          int i = 0;
          int len = 4;
          int cnt = 0;
          byte[] tmp = new byte[len];
          for (i = start; i < (start + len); i++) {
               tmp[cnt] = arr;
               cnt++;
          int accum = 0;
          i = 0;
          for ( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) {
               accum |= ( (long)( tmp[i] & 0xff ) ) << shiftBy;
               i++;
          return Float.intBitsToFloat(accum);
Not sure if i am missing some other way to do this...

Float Arrays and hashcodes

Hi,
I have some problems with generating unique hash codes for float arrays.
The following code will result in "true" on my JVM (JRE 1.6):
System.out.println(Arrays.hashCode(new float[]{0,1,2,3,6,9}) == Arrays.hashCode(new float[]{0,1,3,6,8,9}));Does anyone have an idea how to generate a truly unique hashcode for float arrays?
Thanks for your help,
Dieter

JoachimSauer wrote:
dkleinrath wrote:
JoachimSauer wrote:
But again: you don't usually need a perfect hash. Why do you think you need one?I use static HashMaps to store meta information about specific arrays. I also use a HashSet to search for unique arrays in a big collection of arrays.That's ok. Both HashMap and HashSet can work perfectly with in-perfect hash code (obviously, since perfect hash codes are not possible in many situations).
What they can not handle is .equals() being "wrong" (i.e. inconsistent with hashCode()).
This means that you can't directly use float[] as keys.
You could build a simple wrapper around float[] to be used as keys, 'though.I just tried that and it works like a charm.
Thank you very much for your help.

Converting float array to Float array

Hi, is there any efficent way to convert float[][] to Float[][] without iterating the array and creating Float object for each float data? I have a method performing calculations based on a 2D array( float[][]) and then need to store the result in a TreeMap data structure. The "put" method for TreeMap ask Object type.
Thanks in advance!

1) No
2) An array of float is an object as well:
Object obj = new float[]{1.0, 2.0, 3.0};3) What you want to store? If your structure is somewhat like this:
float[][] f = {
   { 1.0, 2.0, 3.0 },
   { 4.0, 5.0, 6.0 },
};and you want to "index" your TreeMap by the first element of each row of your float[] array, you could do something like this:
    SortedMap sm = new TreeMap();
    sm.put(new Float(f[0][0]), f[0]); // Arrays are objects as well
    sm.put(new Float(f[1][0]), f[1]); //and so on.

Create an image from float array?

Dear All,
I have a float array containing pixel values. From that array I want to create an image (let's say in JPEG format).
How should I do that?
thanks

Hi musti168,
You're going through your entire image pixel-by-pixel and getting each of their values - why don't you just use the IMAQ ImageToArray function?
On this forum post I found an example of IMAQ ArrayToImage: http://forums.ni.com/t5/LabVIEW/IMAQ-arraytoimage-example/td-p/68418
You can use some of the IMAQ Image Processing palette to change the image to gray scale - possibly a threshold.
Julian R.
Applications Engineer
National Instruments

Reading an Array of Objects from a .bin file!

Hey, at the moment I'm creating a program whereby I write a set of objects onto a bin file, in this case an array of objects with a String name/county, and int population/area.... I'm not trying to read it back from the bin file and encountering trouble! I've managed to get it working using plain objects, however I want to be able to read in arrays of objects. The file itself compiles, however during running I get this error
java.lang.NullPointerException
at RecordFiles.CoastalRead.main(CoastalRead.java:33)
at RecordFiles.__SHELL16.run(__SHELL16.java:6)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at bluej.runtime.ExecServer$3.run(ExecServer.java:774)
Here is the program itself,
import java.io.*;
public class CoastalRead {
    public static void main(String[] args) {
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          towns[0] = new CoastalTowns();
          towns[1] = new CoastalTowns();
          towns[2] = new CoastalTowns();
          towns[3] = new CoastalTowns();
          towns[4] = new CoastalTowns();
          String name, county;
          int population, area;
        try {
            FileInputStream fileIn =
                    new FileInputStream("CoastalTownsBin.bin");
            ObjectInputStream in = new ObjectInputStream(fileIn);
            for (int i = 0; i < towns.length; i++){
             towns[i] =(CoastalTowns) in.readObject();
               System.out.println("Deserialized File...");
                   System.out.println("Name: " + towns.name);
          System.out.println("County: " + towns[i].county);
     System.out.println("Population: " + towns[i].population);
          System.out.println("Area: " + towns[i].area);
in.close();
fileIn.close();
} catch (IOException i) {}
catch (ClassNotFoundException c) {}
+I'd appreciate a fast reply!+ And if someone needs the writing class I've used, I can post it asap.

CoastalTowns towns[] = new CoastalTowns[50];
towns[0] = new CoastalTowns();
towns[1] = new CoastalTowns();
towns[2] = new CoastalTowns();
towns[3] = new CoastalTowns();
towns[4] = new CoastalTowns();Why create an array with a size of 50 and then only fill 5 elements?
Why bother filling any elements at all when you are reading the objects from a file?
What happens if there are less than 50 objects in your file?
I will assume CoastalTowns holds info about a single town, so why is it pluralised? Do you have a class called Dog or Dogs, Chair or Chairs, Person or People?
} catch (IOException i) {}
catch (ClassNotFoundException c) {}DO NOT swallow exceptions. At the very least put in a call to printStackTrace so you know if/when an exception occurs.
I'd appreciate a fast reply!I typed as fast as I could but unfortunately I'm still and hunt and peck guy.

Reading from Array

Hi all,
I have a piece of code a need a little help with. I created a method that is supposed to read an array and look for a .,?, or !, which denotes that this is the end of the sentence. I am trying to invoke the method to print out whether or not the end of the sentence has been found, but i can not get the method to work with the array. I keep getting incompatible types errors. Any input would be greaty appreciated.
import java.io.*;
import java.util.*;
public class Linetasks{
public static boolean isEndOfSentence(char c) {
if ((c == '.') || (c == '?') || (c == '!')) {
return true;
else {
return false;
public static long countCharacters(String line) {
long numCharacters = 0;
int index = 0;
while (index < line.length()) {
char c = line.charAt(index++);
if (!Character.isWhitespace(c)) {
numCharacters++;
return numCharacters;
public static void main(String args[]){
String[] s = {
"This line is first.",
"And this one come next.",
"Lastly, we have this one!",
"Are there any more lines"};
char ch = '?';
if (isEndOfSentence(ch)) {
System.out.println("The end of sentence is found.");
else {
System.out.println("The end of the sentence is not found.");

hi,
your modified code..
import java.io.*;
import java.util.*;
public class Linetasks{
public static boolean isEndOfSentence(char c) {
if ((c == '.') || (c == '?') || (c == '!')) {
return true;
else {
return false;
public static long countCharacters(String line) {
long numCharacters = 0;
int index = 0;
while (index < line.length()) {
char c = line.charAt(index++);
if (!Character.isWhitespace(c)) {
numCharacters++;
return numCharacters;
public static void main(String args[]){
String[] s = {
"This line is first.",
"And this one come next.",
"Lastly, we have this one!",
"Are there any more lines"};
// this is for array
//modified by vijay.dr, india
for (int i=0; i<s.length; i++ )
char ch[] = s.substring(s[i].length()-1).toCharArray();
if (isEndOfSentence(ch[0])) {
System.out.println("The end of sentence is found.");
else {
System.out.println("The end of the sentence is not found.");
} try to understand my modification by yourself

How to store (non-persistent) multiple float[] arrays.

Hi;
In a situation where an object needs to store multiple float arrays, how can I use a 2 dimensional array to store them? I can't use a collection since an array is a primitive.
I would use a 2 dimensional array, but my keys to get/set these arrays are ints. So I cant do a "int i[][]", nor a "float f[][]".
Any ideas?
Thanks;
-nat

You could make a Map (such as HashMap) with an
Integer (java.lang.Integer) key and a "int []" or "float []" as a value (an array is an Object, so can be put as a value).You kid me not! I need to review my basics.
I simply didn't know that an array of primitives can be stored as a value in a map.
Thank you!
-nat

Unable 2 read bytes array of images

I have made a client application which will
receive an image from server
the mobile app (clent) is reveiving bytes array in emulator
but unable 2 receive it in real application...
message = new byte[2073]; //string 2 read pic;
for(i=0;i<2073;i++)
//read pic array byte by byte
x=is.read(); //(is is an input stream)
message= (byte)x;
// also tried this
//is.read(message)
works fine in emulator but not in real appication in sony erricson k310i

sorry actually code was.....
for reading byte by byte...............
message = new byte[2073]; //string 2 read pic;
for(a=0;a<2073;a++)
//read pic array byte by byte
x=is.read(); //(is is an input stream)
message[a]= (byte)x; //problem in last post i[] //converting it into italic
//for reading whole array message
// also tried this
is.read(message)
and i think there shall be no problem in converting an[b] int into byte

Reading an array of byte with special delimiter....help me!!

Hi guys,
i've developed a java application that has in input a txt file with a standard format
string string string
string double double
string double double
and stores it into an array of byte with a fixed format,
that is byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)
that mean introducing byte whitespace value and byte ; value to separate different columns and different rows.
Now i have to develop inverse routine,that has to read the array of byte and rebuild its original format.
Can you help me with some idea ord code?
I'm inexepert...please help me with clear suggest...
I post you my routine that converts txt file into an array of byte
P.S.In my txt file number of columns and rows change for each file,what is standard is a firtst headline that is an array of string and others row with the same format string array of doubles....
public byte[] getBytes(){
          byte middlerow=' ';
          byte endrow=';';
          Vector temp=new Vector(10000000);
          int i=0;
          String g=null;
          Riga r;
          Double val[];
          while(i<intest.length){
               //copio tutto nell'array di byte
               byte []bytes = intest.getBytes();
//               memorizza in byte un elemento del vettore alla volta
               for( Byte aByte : bytes ) {
               temp.addElement( aByte );
               temp.addElement( Byte.valueOf( middlerow ) );
               i++;
          temp.addElement(Byte.valueOf(endrow));
          System.out.println("Intestazione convertita in byte");
          for(int l=0;l<rows.size()-1;l++){
               r=(Riga)rows.get(l);
               g=r.getgeneid();
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          temp.addElement(Byte.valueOf(middlerow));
          val=r.getvalues();
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     temp.addElement(Byte.valueOf(endrow));
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          for (int k=0;i<temp.size();i++){
               b[k]=(((Byte)temp.elementAt(k)).byteValue());
          return b;
Thanks for your help...

Ahh, how is the "array of bytes" being populated, Java code?
If so which encoding are you using? When you create the bytes (from a string at a guess) the other end which encoding do you use?
If you are using a db, why not use a db? Why this blob of data?
If I really was banned from using the DB as a DB, and HAD (on pain of death) to use this wonky blob thing, I would do:
Writing:
ByteArrayOutputStream daos = new ByteArrayOutputStream() ;
DataOutputStream dos = new DataOutputStream( daos );
dos.writeUTF( "me String" );
dos.writeDouble( 4.2 );
dos.close;
byte[] stickInUglyBlob = daos.toByteArray() ;
Reading:
DataInputStream dis = new DataInputStream( new ByteInputStream( blobOfUckyness ) );
String meString = dis.readUTF();
double meDouble = dis.readDouble();

Is there any way to read previous day's PSa request

Hi Friends,
I need to read previous day's PSA request data. Is there any way to do it?? Kindly suggest.
Thanks in advance,
Steve.

Hi Steve,
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1. Right click on the datasource
2. Select option "Manage"
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6. In your case please enter yesterday's date.
Regards,
Geetanjali

Sorting a float array

How do you use the sort(float[] a), i want to find the smallest number in my float array? help would be appreciated thanks.

float smallest=0;
float[] smallestCostArray = new float[25];
for(int i=0;i<stageSize;i++)
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this is my code for trying to find the smallest , but i get a "operator < cannot be applied to float,float[]" error when trying to compile.
Message was edited by:
dets00b
Message was edited by:
dets00b

FP Read (Float Array -IO).vi request

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