Array frequency -urgent
Please how do I find frequency number in array. Thank you.
Ah yes its the minus urgent (-urgent) parameter. He should have used the +urgent to turn urgency on.
Similar Messages
-
Help......array problem ,urgent
i not really understand about array.
i got a problem now.
i want turn the data in text file store as array and i want know about the length.
so i code like this:
BufferedReader br=new BufferedReader(new FileReader(filename));
String[] nums=new String[50];
for(int i=0;i<50;i++){
nums=br.readLine();
output="length is:"+nums.length;
after execute,it give the answer is
length is 50.
the 50 is the size i declare.it is not the exact size of the text file.
can anybody help me.coding neededDon't flag your question as urgent, even if it is for you. Claiming urgency is very likely to be counter-productive: most forum regulars will simply ignore such messages as rude and selfish attempts to elicit immediate and special attention.
Besides, unless the Symbionese Liberation Army is about to chase you over the edge of a cliff, your problem probably isn't as urgent as you think. :o) -
Relate to Array.sort(), urgent help~~
I am using a class for store the data
then I need to sort them
is it the vector which want to sort is needed in same class???
because I use other file to access them~~
The following code:
public Test()
Person person;
Vector v = new Vector();
v.add(new Person("Johnson","Fox");
v.add(new Person("Johnson","David");
Object[] a = v.toArray();
Arrays.sort(a);
public int compareTo(Object dd,Object ww)
if (dd instanceof Person && ww instanceof Person)
Person d = (Person) dd;
Person w = (Person) ww;
return w.lname.compareTo(d.lname);
else
return 0;
the code doesn't work btit can compile, can anyone help me to solve it??
thank you for your time~~In Person.java use the following:
class Person
public int compareTo(Object cmpPerson)
if (cmpPerson instanceof Person)
return this.lname.compareTo( ((Person)cmpPesron).lname );
else
return 0;
} -
Creating a byte Array dynamically.Urgent Help needed.
Hi there,
I need to create a byte Array with the values
derived from the array and then am passing this byte array
to a method.
Example :
public static void main(String[] args) throws IOException {
char chars[] = {'a','j','a','y'};
byte[] b = {
(byte) chars[0],(byte) chars[1],(byte) chars[2],(byte) chars[3],
//** Send name to a server.
sendRequest(b);
This is all right.
But here I know the size of the character array chars.
If it had more than 4 characters or less than 4,
is there a way to create the byte array dynamically based on the values in the character array?
Please can some one help me with creating a byte array on the fly?
Has anyone understood my question please?
A response is much much appreciated.The actual problem is this.
The byte array already has some fixed values to it
and i need to append the values of the character array
to this byte array
ie
char chars[] = {'a','j','a','y'};
byte b[] = {
// Predefined values
(byte) 0x01, (byte) 0x7E, (byte)0x03
// I have to add the values from the array here
(byte) chars[0], (byte) chars[1]....
How can I add these values.? The size of the character array
can vary -
Hi everyone, I’m a student who's completely confused using labview. I've a project due in a couple of weeks and it's wrecking my head trying to figure it out. I've got most of it done, but i can't get the rest of it.
I have to modify the attached file to tell a function generator (HP 33120a) to perform a frequency sweep between 100 hz and 10khz with a 1 volt amplitude. The sweep duration has to be 10 seconds and the digital multimeter (hp 34401a) is to be programmed to perform 100 ac voltage measurements. The results are then to be converted into dB and displayed on the front panel as a waveform graph.
Any ideas?
Any sort of help at all would be great. It's a small but annoying part of a big project.
Cheers
Attachments:
lab07.vi 47 KBWell, there's a shipping example in LabVIEW 7 that does exactly what you need but giving it to you as a 6.1 file would probably give you too much. There's a couple of things that you need to do in your example. It's set right now for a single frequency. From a start freq, end freq, and step size, you need to calculate the input frequency in a loop. For example, starting at 100 hz and 100 hz increments, you would set the arb to 100, 200, 300, etc., until the max frequency is reached. LabVIEW has a both a while loop and a for loop. You can enclose your program with either. You also need to change your dmm dunction to read ac volts instead of dc. You don't need to use the dmm to measure frequency because the frequency would be calculated by the VI. Look on the Numeric>Logarthmic palette for a function that you can use to convert your RMS reading from the dmm into dB. Finally, you should use an XY graph to plot the frequency versus gain. The XY graph takes an x array (frequency) and a y array (gain) as inputs. The measured gain and the input frequency can be output from a while loop or for loop and be automatically built into an array. For a while loop, click on the output tunnel and select Enable Indexing. This is the default behavior of a for loop so if you use one of these, you don't have to do anything. I hope that's enough to get you started.
-
I am connected to a Spectrum Analyzer via GPIB using LabVIEW 7.1. I am able to control the anaylzer and gather the data(plot and table) in the frequecy domain. However, I need to convert the data taken in the frequency domain and convert it to the time domain. I am trying to use the real IFFT.vi, but not not quiet sure if I'm using it correctly. I have a 2D- array(frequency and Amplitude) and the VI only has a 1-D input. The final result I need is to have a table and plot of the data in the time Domain. Any help would be greatly appreciated. thanks
You only need to transform the 1D array of amplitudes. You need to know the frequencies to get deltaF from which you will be able to calculate the delta time in the transform, but that is just a scaling task. You also need to know how the frequency domain data is arranged, because there are a few flavors (e.g. DC centered, Nyquist centered).
Please attach your VI with some representative data contained in a diagram constant and I'll have a look.
Don't confuse array dimensionality. A true 2D array has three dimensions: (row index, column index, value), most likely you have a 2D array with e.g. two colums, one for the amplitude and one for the frequency, so it is more like a compact representation of 2 1D arrays.
LabVIEW Champion . Do more with less code and in less time . -
How to change the frequency of pulse train on the fly using an array of values?
Hi all!
First I want to thank U for the great job you are doing for this forum.
Iam still busy trying to control a stepper motor, by sending pulses from my E-series 6024 to a compumotor s6- stepper Driver. I've managed to get it working. I desperately need to control the motor using the values from an array. I believe we can use two approaches for that:
1st - I can get an array of the "numbers of pulses". Each element must run for 10 milliseconds. Using that we can calculate the array of frequencies to send the number of pulses within 10 milliseconds for each specific element. Could we use the arrays of "number of pulses" and frequencies in a "finite pulse train " and up
date with each element every 10 millisecond?
2nd - Or Could we use of the frequency array in a "continuous pulse train vi" and update it every 10 milliseconds?
Please note that I must use the values as they are.
Can someone please built a good example for me? Your help will be appreciated.
Regards
Chris
Attachments:
number_of_steps.txt 17 KB
frequency.txt 15 KBTiano,
I will try to better explain the paragraph on LabVIEW. The original paragraph reads ...
"While in a loop for continuous pulse train generation, make two calls to Counter Set Attribute.vi to set the values for "pulse spec 1" (constant 14) and "pulse spec 2" (constant 15). Following these calls you would make a call to Counter Control.vi with the control code set to "switch cycle" (constant 7). The attached LabVIEW programs demonstrate this flow."
You can make two calls to Counter Set Attribute or you can make a call to Set Pulse Specs which, if you open this VI, you will see that it is just making two calls to Counter Set Attribute. What you are doing with the Counter Set Attribute VIs is setting two registers called "pulse s
pec 1" and "pulse spec 2". These two registers are used to configure the frequency and duty cycle of your output frequency.
The example program which is attached to this Knowledge Base demonstrates how to change the frequency of a continuous generation on the fly. Why continuous? Because changing the frequency of a finite train would be easy. When the train completes it's finite generation you would just change the frequency and run a finite train again. You would not care about the time delay due to reconfiguration of the counter.
If you would like to change the frequency of the pulse train using a knob, this functionality will have to be added in the while loop. The while loop will be continuously checking for the new value of the knob and using the knob value to set the pulse specs.
LabVIEW is a language, and as with learning all new languages (spoken or programatic) there is a lot of learning to be accomplished. The great thing is that LabVIEW is much easier than mo
st languages and the learning curve should be much smaller. Don't fret, you'll be an expert before you know it. Especially since you're tackling a challenging first project.
Regards,
Justin Britten -
Dear Java Folks,
I still need your help!
I am still having problem after succeeding in tokenizing the Strings in LinkedList.
What I wanted to do is to find the Frequency of words or characters in an Array.
E.g
1�A,C,F,G,A
2�Baby,H,K,A,C,K
3�Oslo,S,F,T,K
The first line will return 2A, 1C, 1F, 1G. Thereafter, I will find the Frequency of the second line which will be 1Baby, 1H, 2K, 1A, 1C etc.
For now, I am only interested in getting the Frequency
of the first line.
My Code
public String DataCall() {
DataInputStream dis = null;
String line = null;
String []words;
String []Lines;
List <String>result = new LinkedList<String>();
List<String> dataList1 = new LinkedList<String>();
List<String> dataList2 = new LinkedList<String>();
List<String> onlyWords = new LinkedList<String>();
List<Integer> frequency = new LinkedList<Integer>();
int counter = 0;
try {
File data = new File("C:/text.txt");
FileInputStream in = new FileInputStream(data);
dis = new DataInputStream (in);
BufferedReader br = new BufferedReader(new InputStreamReader(dis));
line = br.readLine();
if (line != null) {
Lines = (line.split(" ")); //Split the first row or line
for(String datas : Lines) // add the data to the Linkedlist
dataList1.add(datas);
for (int i = 0; i < dataList1.size(); i++) {
words = (dataList1.get(i).split("�")); // split to get to �
for (int b = 0; b < words.length; b++) {
String []wordCount = words.split(","); // split the remaing words or characaters
for (String saveD : wordCount)
onlyWords.add(saveD); // add the data to Linkedlist "onlyWords
// Start the frequency calculation
for (int point = 0; point < onlyWords.size(); point++)
if (!dataList2.contains(onlyWords.get(point))) //Initially dataList2 is empty here
dataList2.add(onlyWords.get(point)); // add data to Linkedlist "datalist2"
frequency.add(1); // add 1 to (int) Linkedlist "frequency"
else
int tmp = 0;
tmp = onlyWords.indexOf(point); //get the index where the "word" occured first
counter = frequency.get(tmp); //ge the value of the same index in the Linkedlist "frequency"
counter++;
frequency.set(tmp, counter);
for (int k = 1; k < dataList2.size(); k++) {
System.out.println(onlyWords.get(k) + " " + frequency.get(k));
else System.out.println("There is no data to read\n");
catch (IOException e) {
//catch io errors
System.out.println("IOException error: " + e.getMessage());
finally {
// if the file successfully opened
if (dis != null) {
try {
dis.close();
catch (IOException ioe){
System.out.println("IOException error when trying to close the file: " + ioe.getMessage());
}//end if
}// end finally
return null; // just for a test. I will return result
} // end DataCall
The code if run shows the the following the errors;
at java.util.LinkedList.entry(Unknown Source)
at java.util.LinkedList.get(Unknown Source)
at fileReader.DataFrequency.DataCall(DataFrequency.java:80)here i have modified the code, but still getting the error in the count
import java.io.File;
import java.util.Formatter;
import java.util.Scanner;
public class StudentPoll_dasariHaritha {
private Scanner x;
int[] frequency = new int[5];
int count =0;
public void openFile(){
try{
x = new Scanner(new File("numbers.txt"));
catch(Exception e){
System.out.printf("No File found");
public void readFile(){
while(x.hasNext()){
int a= x.nextInt();
if(a==1){
frequency[0]=0;
++frequency[0];
break;
else if (a== 2){
frequency[1]=0;
++frequency[1];
break;
else if( a==3){
frequency[2]=0;
++frequency[2];
break;
else if (a==4){
frequency[3]=0;
++frequency[3];
break;
else if (a== 5){
frequency[4]=0;
++frequency [4];
break;
System.out.printf("%s%10s\n","Rating","Frequency");
System.out.printf("%s%10s\n","1",++frequency[0]);
System.out.printf("%s%10s\n","2",++frequency[1]);
System.out.printf("%s%10s\n","3",++frequency[2]);
System.out.printf("%s%10s\n","4",++frequency[3]);
System.out.printf("%s%10s\n","5",++frequency[4]);
public void closeFile(){
x.close();
in the main method iam calling these methods
StudentPoll_dasariHaritha read = new StudentPoll_dasariHaritha();
read.openFile();
read.readFile();
read.closeFile();
i think in the while loop iam making a mistake. can someone help me in rectifying it. -
URGENT HELP::: returning array of non built in datatypes
Folks,
I am trying to implement webservices in weblogic7.0 sp2. We have written a simple
class(say ClassA) which uses another bean as a user defined data type(ClassB implements
serializable). I am able to create a webservice if one of the method in ClassA
returns the object of classB.I am getting an error while creating the web-services.xml
file using ant tool if same method in ClassA returns array of ClassB.It says
corresponding type is not found in the types.xml. I created types.xml using ant
tool too.
Does weblogic7.0 SP2 support returning array of objects in webservices?
Any suggestions and immediate response is highly appreciated.
Thanks,
Kamal.Bruce,
You understand the question correctly..Thanks for the help... it works now.
Thanks,
Kamal.
Bruce Stephens <[email protected]> wrote:
Hi Kamal,
If I understand your question correctly, yes, you should be able to do
this. You will need to create your own implementation of the
javax.xml.rpc.holders.Holder interface. See:
http://edocs.bea.com/wls/docs70/webserv/implement.html#1054236 for
details.
If that's not what you are asking, could you post a simple test case?
HTHs,
Bruce
BTW, for URGENT issues, please use our excellent support folks:
http://support.bea.com
[email protected]
kamal wrote:
Folks,
I am trying to implement webservices in weblogic7.0 sp2. We have writtena simple
class(say ClassA) which uses another bean as a user defined data type(ClassBimplements
serializable). I am able to create a webservice if one of the methodin ClassA
returns the object of classB.I am getting an error while creatingthe web-services.xml
file using ant tool if same method in ClassA returns array of ClassB.Itsays
corresponding type is not found in the types.xml. I created types.xmlusing ant
tool too.
Does weblogic7.0 SP2 support returning array of objects in webservices?
Any suggestions and immediate response is highly appreciated.
Thanks,
Kamal. -
Urgent !!! regarding mapping of frequency to operation.....Have ur points.
Hi all,
In transactin IA05, we make tasklist master.
I want to link (task group->group counter-><b>operation->frequency</b>) in my itab. Pleas suggest me the table in which i can link the operation with frequency.
Very urgent....thanks in advance
<b>Have your points.</b>
Regards,Hi yaar..thanx for reply..
yaar Here frequency means the frequncy of operation which we set after clicking on maintenance package.
PLPO Is task-list operation/activity master, contains data regarding operations....there is no field by which i can link the operation with the frequency.
We have some tables of maintence package master....that also don't have the linking field.
following are the tables.
T351P
T351X
T351
T351T
Pleas assist me.... -
I have an array here numbers are coming continuously, I have to make a table of number and repeition (frequency) of the number
So? It is not clear what exactly you want to do. Nor is it clear what problems you are having (other than asking us to do your work for you). Why don't you try to solve this problem yourself, and if you get stuck, show us your code, tell us what questions you have, and someone will surely help you.
BS -
Urgent array help needed! come get some duke points
this program keeps track of rentals for a shop. Other methods and classes not shown (like Customer, Transaction classes) are also in this program. Every item (created with a constructor in Item class) can hold an array of up to 20 transactions; part of a Transaction object is a rental total, based on a number of rental days * specific rental price for that item rented (backhoe, edger, etc.) If the user presses "t" for total amount of transactions, the following method is called, which calls the getTotalPrice() in another class called Item. My problem here is that even if I enter in transaction amounts, when I press "t", the program just quits, not producing the report and returning me to the main class. I have been over it with the debugger and I am still lost. Below is some selected code; I hope it is sufficient. Please let me know if I need to put up more
//main
String input = JOptionPane.showInputDialog(null, "Enter a rental transaction (x)" +
"\nAdd a customer (c)" +
"\nAdd an item (i)" +
"\nReport on a specific item (r)" +
"\nReport on total dollar amounts of rentals for all items (t)" +
"\nReport on total rentals for a specific customer (s)" +
"\nStrike cancel to exit from the program");
//big huge while
while (input != null){
if (input.equals("x")){
rentalTrans();
}//if
if (input.equals("c")){
addCustomer();
}//if
if (input.equals("i")){
addItem();
}//if
if (input.equals("r")){
specificItemReport();
}//if
if (input.equals("t")){
allItemReport();
}//if
if (input.equals("s")){
customerReport();
}//if
input = JOptionPane.showInputDialog(null, "Enter a rental transaction (x)" +
"\nAdd a customer (c)" +
"\nAdd an item (i)" +
"\nReport on a specific item (r)" +
"\nReport on total dollar amounts of rentals for all items (t)" +
"\nReport on total rentals for a specific customer (s)" +
"\nStrike cancel to exit from the program");
//allItemReport()
public static void allItemReport(){ //menu item t
Item temp = null;
for (int index = 0; index < items.length; index++){
temp = items[index];
}//for
JOptionPane.showMessageDialog(null, "Total rental transactions to date amount to: $" + temp.getTotalPrice());
//Item Class
public String getTotalPrice() {
double total = 0;
String output = "";
for (int i = 0; i < trans.length; i++) {
if (trans[i] == null) {
if (i == 0) {
output = "There are currently no transactions.";
}// if
break;
}// if
else{
total += getPerDayRentalPrice();
}//else
}// for
output+= total;
return output;
}//getTotalPriceDon't flag your questions as urgent. It's rude. Also don't think that waving with a couple of worthless Dukes is going to get you better/quicker help.
The reason I respond to your question is because you have explained your problem well and used code tags.
Try this:class Main {
public static void main (String[] args) {
String message = "Enter a rental transaction (x)\nAdd a customer (c)" +
"\nAdd an item (i)\nReport on a specific item (r)\nReport on total "+
"dollar amounts of rentals for all items (t)\nReport on total rentals"+
" for a specific customer (s)\nStrike cancel to exit from the program";
String input = JOptionPane.showInputDialog(null, message);
while(input != null){
if (input.equals("x")) rentalTrans();
else if (input.equals("c")) addCustomer();
else if (input.equals("i")) addItem();
else if (input.equals("r")) specificItemReport();
else if (input.equals("t")) allItemReport();
else if (input.equals("s")) customerReport();
else System.out.println("Invalid option!");
input = JOptionPane.showInputDialog(null, message);
System.out.println("Bye!");
// the rest of your methods ...
} -
Amplitude Array with niFgen Frequency List Mode
I was wondering if there was a way to easily set a different amplitude for each frequency in a Frequency List? Ideally I would want this to be in an array.
When using Frequency List Mode, you can define the frequencies and durations in an array using the Create Frequency List VI:
However the Configure Frequency List VI only allows you to specify a single value for the amplitude:
The only approach I can think of is using Property Nodes, however that seems like it will be an exact solution. Trying to increase the amplitude (or gain) "on-the-fly" seems to cause discontinuities and has some delay before taking effect.
I am looking for something similar to this example, except with another column for unique amplitudes for each segment of the list:
Does anyone know how I might go about this? Any approaches/ideas will be greatly appreciated! Thanks in advance!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If someone helped you out, please select their post as the solution and/or give them Kudos!Hello,
With the Frequency List mode, you are limited to outputting varying frequencies of a standard function at a certain amplitude. To do what you're describing you would want to use either Arbitrary Waveform or Arbitrary Sequence mode with a capable card instead. A good example of doing this on the fly with Arbitrary Waveform can be found here: https://decibel.ni.com/content/docs/DOC-8391.
Matt Lee
National Instruments
Applications Engineer -
I have been creating random numbers that I'm using within a system, the system is working fine, but now I have realised that the random numbers must be outputted to speakers in such a way as to filter out all but a low frequency range.
I was thinking about generating a dither signal with a bandpass filter, but could not get it to give me out a full array of 250 values which I could then manipulate.
The sampling frequency of the output is 200Hz and the 250 data points must fall within the 0-100Hz range.
Another course of action I am considering is to use an FFT and an inverse FFT to get the data that I'm looking for, but I'm fair
ly inexperienced with using labVIEW and can't quite get it to work.
Thanks for the help,
Hank.As you may already know, in the Functions palette/Analysis VIs/Filters VIs are VIs for filtering. There are also some examples for using these filters under Examples/Analysis/fltrxmpl. You may find some of these are related to your situation, especially for filtering out the higher values.
An option is to simply output the random values to a Comparison/"less than or equal" function, where only values <= to 100 would be sent to an array which is in a For loop. Use the iteration counter of the For loop to count up to 250, at which time you would pass the whole array to your next node. This would let you have 250 values between 0 and 100 for your final array.
Good luck. -
Lowpass filtering an array of waveforms with different cutoff frequencies
I'm trying to take an array of waveforms and have seperate filter settings for each individual waveform. For example, I want to have a 2 hz cutoff frequency on my thermocouple inputs and a 100 hz cutoff frequency on a strain gage input.
When I try to accomplish this using the Butterworth filter (as shown in the image) I get weird results. The VI seems to be setup to only handle 1 waveform at a time. If I set the init/cont to F for init, the beginning of each waveform segment is reset to 0 which wrecks the data files. If I set the init/cont to "T" for continuous, the data is completely wrecked because the waveforms are interferring with each other. Clearly this VI is not setup for muliple instances (for use in a for loop).
There are the Waveform filters, but I seem to only be able to use 1 cutoff frequency for the entire set of waveforms.
In the subVI image below, I input an array of waveforms into a for loop with the settings collection for each channel (element in the waveform array). I pass the cutoff frequency to the butterworth filter with the Y data array from the segment of the waveform. Waveform data is supplied continuously (I need a live data filter).
Thanks for your input.
Attachments:
Filter applied to multiple waveforms.png 17 KBYou are correct (about the true/false on the cont/init input). Not sure I follow what the help is saying to do...
Is there anyway to verify the number of instanced "Filter Duplicates" are running? I'm still having a lot of issues with my implimentation and I'm wondering if I'm not initializing everything correctly. I've even added a button that should push a new re-initialization. I'm trying to have an interface that allows the user to turn off and on the filter while data is be aquired. Here is some of my code that I'm using to try and accomplish that, but after I've enabled the filter on multiple waveforms and hit my "re-initialize" button I still get bizarre data artifacts (like spikes) that would not be indicative of data on the other side of a low pass filter. Thanks for any additional feedback.
I've modified your Filter Duplicate to have an "Enable" feature so that the waveforms that I do not want any filtering of are just passed through.
I've tried to re-create the functionality of your Test multi-filter VI Server, but with the added boolean option to not have the filter performed:
So when "True" is on init/cont input the VI is re-open by VI server and the true signal propagates to the Filter Duplicate Asynchronous call. Here is a snippit from my main window call:
Lastly, here is the noisy data I'm dealing with:
Here is the data after I apply a 5Hz filter to each one:
Clearly data from one is being imposed on the other. Hitting my "re-initialize" button to send a "true" signal through doesn't fix it. How can I verify that my filters are working independently as desired?
Thanks!
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