Help: JSP Random Number Generator

hello every one,
Im trying to generate a random number using currentTimeMillis(), in Jsp, can you help me out and advice me how can this be done please.

First you say you want a random number, then you say you want a unique one. Which is it?
Random numbers do not normally guaruntee uniqueness.
is there away i could use the currentTimeMillis(), What would you use it for? System.currentTimeMillis() is commonly used as a seed for a random number generator. The java.util.Random class uses it like that - take a look at that API link.
Or if its a homework question state the exact requirement - I'm guessing here.

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Help for random number generator???

hi there can anyone how to make simple random number
generator for slot machine , formula for chances in probability ,
or simple random number generator for slot machine , thanks
:)

actualy the accurate RNG for slot machine ?? any idea?

Random NUMBER generator help..

Hi all,
i'm having issues with my random number generator i'm trying to fill my array with random numbers but i keep getting it filled with zeros.... can any one tell me what i'm doing wrong i can;t figure it out..
for (int i =0; i < 100; i++){
int x=(int) (Math.random());
data[i] = x;
}

From the API "Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0."
So casting the value to int is always going to result in a zero value.
You need to multiply by a value that is one larger than the value you want to be your maximum. For example:
int x = (int)(Math.random() * 100);
should create a random number from 0 to 99

Random Number Generator setSeed(); method???

I've searched and can't get a good understanding of the setSeed() method. I am suppose to use the loop control variable to seed the random number generator inside the loop. I need to use the same input everytime I use the random generator. When I compile it says int cannot be dereferenced.
for(int i = 0; i < array.length; i++)
int randnum = generator.nextInt(100);
randnum.setSeed(i);
array[i] = randnum;
If anyone can explain the setSeed() method that would be greatly appreciated. Thanks!

badbro wrote:
Thanks for your help, but leave the smart comments to yourself. They are not needed. Thats what this forum is for.All of Paul's comments were dead spot on, and if you listen to him and take his advice to heart, it will only help you. If they make you upset, well then that's your problem, isn't it? My advice: grow up.

Random number generator. Even and odd numbers

I have a problem.
I have a random number generator, it goes from 0 to 20, I need to have two indicators, one will show how many numbers are pairs, and how many are not.
I tried to use the decimated 1D array, but since those numbers are random, it doesn´t work for me. I´m new with LabView, and I don´t know if there is some other way to make it work, I need some help, especially with some examples.
Thank you so much.
Solved!
Go to Solution.

RavensFan wrote:
Spoiler (Highlight to read)
Create the array. Use quotient remainder to divide by 2. Now you have an array where all the odd numbers are now 1, and all the even numbers are now 0. Sum the array and you have the total number of odd numbers. The number of evens will be the length of the array divided by the # of odds.
Create the array. Use quotient remainder to divide by 2. Now you have an array where all the odd numbers are now 1, and all the even numbers are now 0. Sum the array and you have the total number of odd numbers. The number of evens will be the length of the array divided by the # of odds.
Haha I lost sight of the fact that he was looking for the amount off odds and evens. Good one.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

Does Labview have a Random Number Generator for U16 with a periodicity greater than 64 Million instances of U16words and one with SEED as the connector?

We are doing some testing that requires 64MegaWords be written to our DSP memory with random values to do a validity check and without repeating sequences with using the previous value as the seed for the next and us passing it the initial seed. The dice one doesn't meet that criteria, and I was not sure how the continuous random number generator parameters work and if any of them would meet this criteria. Anyone have any information that might help?
Thanks,
Sue

Hi suem,
There is no reason why you couldn't simply write a pseudo-random number generator by yourself. Simply select a random number algorithm you want to use and implement it in LabVIEW. You do not need to interface code written in another language in order to implement a pseudorandom number generator. If you have a DAQ card or something, you can also use inputr noise or some other hardware soruce to generate real random numbers. For that also LabVIEW is an excellent tool.
Tomi
Tomi Maila

Uniform random number generator

anyone of u know how to generate UNIFORM RANDOM NUMBER GENERATOR that has serious faults ?

jwenting wrote:
uj_ is right (never thought I'd say that).
ANYTHING "uniform" is by definition not random.Well, the correct term is "random numbers from a uniform distribution". And there certainly exist such generators (athough they're pseudo-random of course).
I lost my temper because I've spent considerable time helping sosys only to realize he's a notorious cheater. Sosys claims to be a college student attending a CS class. With the knowledge, or rather lack thereof, he's displaying he must've cheated systematically for a long long time. I'm quite liberate at helping people with their homework but I won't help a leech become a programmer.

Plot xy graph using random number generator

How do i plot xy graph dynamically every 5 seconds with a random number generator?
X axis : Time
Y Axis : Random number generator

I've done tis so far. im able to plot dynamically every 1 second.
but the problem i am facing is The X axis display every 1 second.
i want it to be fixed 24 hours time format, and the data will gradually plots the data on y axis against x axis every one second, without changing the scale of the x axis (24hour time format)

Java random number generator

Hi does java have a random number generator. If it does can you point me to it please. Thank you.

you can use "java.Math.random()" this function returns a value which is greater than or equal
to 0.0 and less than 1.It returns a double value,so you can multiply by 10 and cast it to int,so that it
can produce numbers between 0 & 9.Yes, you can do that. But, as stated before, java.util.Random has methods that are easier to use for random int values than using java.Math.random is for random int values. It all depends what the OP wants. The OP hasn't come back with additional questions, or to say that he found his answer. So, we don't know whether he has his answer (he has several options now!) or not. :)

Random Number Generator issues

Ok so I have an issue. I'm supposed to create a GUI app that has a frame that contains both a button and a textfield. When the button is pressed then a random number between 1 and 10 should appear in the textfield. I've got an illegal start of expression on line 49 which is the last private void...
So what have I done wrong?
* randomnumber.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
public class randomnumber extends JFrame
     Random randomObject = new Random();
// declare controls used
static JButton startButton = new JButton();
static JTextField startTextField = new JTextField();
public static void main(String args[])
    new randomnumber().show();
public randomnumber()
    // frame constructor
    setTitle("Random Number Generator");
    getContentPane().setLayout(new GridBagLayout());
    // add controls
    GridBagConstraints gridConstraints = new GridBagConstraints();
    startButton.setText("Generate a Number");
    gridConstraints.gridx = 0;
    gridConstraints.gridy = 0;
    getContentPane().add(startButton, gridConstraints);
    startButton.addActionListener(new ActionListener()
      public void actionPerformed(ActionEvent e)
        startButtonActionPerformed(e);
    startTextField.setText("");
    startTextField.setColumns(15);
    gridConstraints.gridx = 2;
    gridConstraints.gridy = 0;
    getContentPane().add(startTextField, new GridBagConstraints());
private void startButtonActionPerformed(ActionEvent e)
    myInt = randomObject.nextInt(11);
    startTextField.setText(String.valueOf(myInt));
}Edited by: Hessmix on Oct 17, 2007 6:15 PM

public randomnumber()
    // frame constructor
    setTitle("Random Number Generator");
    getContentPane().setLayout(new GridBagLayout());
    // add controls
    GridBagConstraints gridConstraints = new GridBagConstraints();
    startButton.setText("Generate a Number");
    gridConstraints.gridx = 0;
    gridConstraints.gridy = 0;
    getContentPane().add(startButton, gridConstraints);
    startButton.addActionListener(new ActionListener()
      public void actionPerformed(ActionEvent e)
        startButtonActionPerformed(e);
    startTextField.setText("");
    startTextField.setColumns(15);
    gridConstraints.gridx = 2;
    gridConstraints.gridy = 0;
    getContentPane().add(startTextField, new GridBagConstraints());
}//<< Add a brace here
private void startButtonActionPerformed(ActionEvent e)
    myInt = randomObject.nextInt(11);
    startTextField.setText(String.valueOf(myInt));
}Did you add that brace?

Defining a lower boundery for a random number Generator

Hi,
I am using the code:
Random rand = new Random();
int x = rand.nextInt(50);
to generate a random number between 0 and 49
However I now need to only select a number between 20 and 49
Is there any way to give the random number generator a lower boundery as well as an upper boundery ??
Thank you
Craig

example:int x = rand.nextInt(30) + 20;Will generate a number between 20 and 49.

How do I create a random number generator?

I know I've done it before...but I can't remember quite how to get it going. I'm creating a math tutor program, which generates two random numbers and asks the user to add them, and if the answer is right they get a message that gives props and if they get it wrong they're told they got it wrong.
I can't get too far because I've forgotten how to make the number generator, so what exactly do you put in to get it?
import java.util.*;
public class AssignmentFour3 {
     private static Random integer = new Random();
     double number1 = 0;
     Random string1 = new Random();
     }

DrClap wrote:
Generally I don't write my own random number generator. I just use the java.util.Random class.I read it as though that that is what he was going to use, but wasn't able to read the API docs to figure out what methods to use. ;-)

Favorite random number generator.

As I hope that not everyone is using the core java API for generating random ints, floats, etc., I was curious what RNG (random number generators) people are using. I am currently using the Mersenne Twister Fast, and have glanced at the RNG in the Colt API. What do you use? What is your favourite RNG?

I also favor this crisp random number generator, which is adapted to Java from the book "Numerical Recipes in C++".
http://www.nr.com/cpp-blurb.html
public class Ran {
              private int idum;
             final static int IA = 16807;
     final static int IM = 2147483647;
     final static int IQ = 127773;
     final static int IR = 2836;
     final static int MASK = 123459876;
     final static double AM = 1.0 / (double)IM;
            Ran(){
                this.idum = (int)(System.currentTimeMillis()%262144L);
            Ran(int n){
                this.idum = n;
    final public double rand(){
     this.idum ^= MASK;
     int k = this.idum / IQ;
     this.idum = IA*(this.idum - k*IQ) - IR*k;
     if(this.idum < 0){this.idum += IM;}
     double ans = AM*this.idum;
     this.idum ^= MASK;
     return ans;
}(This is a privately converted version, not published.)

Method for a random number generator???

I need a method to generate a random number between zero and X, X being a variable set by my program. The only method I can find is Math.random(), which generates a number between 0.0 and 1.0. (Of course, I can multiply to make it an int). Can you help me out?

I dont know if this will help not but you could do this:
RandomNum = (int)Math.floor(Math.random() * X);
I think that should generate your random number between 1 and variable X
Regards,
Carl

I need help with random number in GUI

hello
i have home work about the random number with gui. and i hope that you can help me doin this application. and thank you very much
Q1)
Write an application that generates random numbers. The application consists of one JFrame,
with two text fields (see the figures) and a button. When the user clicks on the button, the
program should generate a random number between the minimum and the maximum numbers
entered in the text fields. The font of the number should be in red, size 100, bold and italic.
Moreover, if the user clicks on the generated number (or around it), the color of the background
should be changed to another random color. The possible colors are red, green blue , black ,cyan
and gray.
Notes:
�The JFrame size is 40 by 200
�The text fields size is 10
this is a sample how should the programe look like.
http://img235.imageshack.us/img235/9680/outputgo3.jpg
Message was edited by:
jave_cool

see java.util.Random

Help: JSP Random Number Generator

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