Need An Algorithm That Generates Random Numbers

Hi, I understand that there is a built-in random number generator. But, I need an algorithm that generator random numbers. Is there one available? Thanks.

Hi, is the "Seminumerical Algorithms" a book?What
the numbers 3141592621 and 907633385 stand for?The first is PI without a decimal... the second I
don't know, it may as well be randomly picked.As far as I know the numbers aren't randomly picked. You want the distribution to be good, and the length of the serie should also be long. Some numbers causes the cycle to be short, or the distribution to be bad. I think there are articles that lists 'good' numbers.
/Kaj

Similar Messages

How to generate random numbers that doesnt contain characters?

How do we generate random numbers in ESB ROuting Service/ XSL transformation that does not contain characters. I have been using "orcl:generate-guid()" , but it contains some characters, so, I substring it to get only numbers. I dont want to take this risk and in future, my substring itself may contain characters.
Has anybdy tried this before?
Thanks,

If the goal is to have a pseudo random number then consider using the translate function to replace the occurances of the A - E characters with another digit. For example:
translate(orcl:generate-guid(),'0123456789ABCDEF','0123456789123456')
This will produce a 1 for A, 2 for B, etc. While not a valid hex to decimal conversion of the GUID value, it does get around the hex issue and might be sufficient for your purposes.
I would perform a large sample test to see just how unique the values end up being.
As for why hex is used, well GUID's are most commonly written in text as a sequence of hexadecimal digits such as: 3F2504E0-4F89-11D3-9A0C-0305E82C3301. i.e. 128 bits represented in 32 characters formatted into 5 sections.
Hope this helps,
Peter

How t generate random numbers at everytime of exceutuion of the program

dear friends
i am facing a problem that the random numbers generated at time of each exectuion of the program are not the same, i want to generate the same random numbers every time time i run the program. i need your help. i am giving the code in c++ if anybody can help in providing the solution so that i get the same random numbers at every run of the program. waiting for your help
wit regards
jaya shankar
#include<iostream.h>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<math.h>
class density
int s[150][150],parent[150][150],i,j,l,n,loop;
public:
void bd(void);
void css(void);
void density :: bd(void)
cout<<"ENTER THE POPULATION SIZE = ";
cin>>n;
cout<<"\nENTER THE NO.OF LOOPS = ";
cin>>loop;
for(i=0;i<n;i++)
for(j=0;j<80;j++)
s[j]=rand()%2;
cout<<"s:"<<s[j];
void density :: css(void)
int a,b;
float c;
for(i=0;i<n;i=i+2)
b=rand()%100;
cout<<"random b="<<b;
main()
density d;
d.bd();
d.css();

This will help you I think.
import java.io.*;
import java.util.*;
public class RandomTest
     public static void main( String arg[]) throws Exception
          Random number = new Random(100);
          for( int i = 0 ; i < 15; i++){
               System.out.println( number.nextInt( 100 )) ;

Please help to write a java code for generate Random numbers

I need a program for generate Random integer numbers by using roulette wheel theory. I search several ares, but I'm unable to find out at lease a Pseudo code for implement this. If you know or have a code for this, Please send me a mail to [email protected] or post here.

Gagana wrote:
I need a program for generate Random integer numbers Have a look at the java.util.Random class:
[http://java.sun.com/j2se/1.5.0/docs/api/java/util/Random.html]
Or Google:
[http://www.google.com/search?q=random+java]
by using roulette wheel theory. What is that?
... Please send me a mail to [email protected]
No, that defeats the purpose of a public forum. And no one is going to e-mail you (other than someone trying to sell V1AGRA).

How to generate random numbers of the same at each time of execution of thm

dear friends
i am facing a problem that the random numbers generated at time of each exectuion of the program are not the same, i want to generate the same random numbers every time time i run the program. i need your help. i am giving the code in c++ if anybody can help in providing the solution so that i get the same random numbers at every run of the program. waiting for your help
wit regards
jaya shankar
#include<iostream.h>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<math.h>
class density
int s[150][150],parent[150][150],i,j,l,n,loop;
public:
void bd(void);
void css(void);
void density :: bd(void)
cout<<"ENTER THE POPULATION SIZE = ";
cin>>n;
cout<<"\nENTER THE NO.OF LOOPS = ";
cin>>loop;
for(i=0;i<n;i++)
for(j=0;j<80;j++)
s[j]=rand()%2;
cout<<"s:"<<s[j];
void density :: css(void)
int a,b;
float c;
for(i=0;i<n;i=i+2)
b=rand()%100;
cout<<"random b="<<b;
main()
density d;
d.bd();
d.css();

Do not randomize the random number interface when you start your application. When the random number interface is not randomized when starting you get the same sequence of numbers each and every time you use it.

How to generate random numbers from 1 to 5

How to generate random numbers from 1 to 5
-1110340081
Solved!
Go to Solution.

(You should not mark a post as solution unless it actually contains a solution to the original problem)
Do you want to share your code? Did you test to make sure that all numbers equally probable?
LabVIEW Champion . Do more with less code and in less time .

How to generate random numbers in a range using random class?

I know how to use Math.random for this, but how would I generate random numbers using the random class?
Say I want a number between 40 and 50, inclusive--how would I do this?
What i have in mind is:
int randomNumber = random.nextInt(max) + min;
where max is 50 and min is 40. Is this correct?

Fredddir_Java wrote:
I know how to use Math.random for this, but how would I generate random numbers using the random class?
Say I want a number between 40 and 50, inclusive--how would I do this?
What i have in mind is:
int randomNumber = random.nextInt(max) + min;
where max is 50 and min is 40. Is this correct?What happened when you generated a couple hundred numbers that way? Did you get all the ints in the range you wanted?

Generating random numbers, while excluding some numbers

I want to generate random numbers between 1 and 13 (including 1 and 13), while excluding numbers 6 and 9
Please tell me theres an easy fix to this issue --

lemme know if it compiles
import java.util.*;
public class RandomNumber {
public static void main( String[] args) {
int numWins = 0;
for( int i = 1; i < 101; i++) {
boolean x = true, y = true;
int number = 0;
while(!x && !y && number != 6 && number != 9)
number = 1 + (int) (Math.random() % 13);
x = number >= 1;
y = number <= 13;
int number2 = 0;
while(!x && !y && number2 != 6 && number2 != 9)
number2 = 1 + (int) (Math.random() % 13);
x = number2 >= 1;
y = number2 <= 13;
int number3 = 0;
while(!x && !y && number3 != 6 && number3 != 9)
number3 = 1 + (int) (Math.random() % 13);
x = number3 >= 1;
y = number3 <= 13;
int number4 = 0;
while(!x && !y && number4 != 6 && number4 != 9)
number4 = 1 + (int) (Math.random() % 13);
x = number4 >= 1;
y = number4 <= 13;
int DrawAgain = 2;
if (number == DrawAgain) {
System.out.println( "A Random number between 1 and 10: " + number);
System.out.println( "A second Random number between 1 and 10: " + number2);
if (number2 == 8) {
System.out.println( " Piece made it home successfully");
numWins++;
if (number2 == DrawAgain) {
System.out.println( "A third Random number between 1 and 10: " + number3);
if (number2 == 7) {
System.out.println( " Piece made it home successfully");
numWins++;
if (number3 == DrawAgain) {
if (number4 == 7)
System.out.println( " Piece made it home successfully");
numWins++;
else {
System.out.println( "A Random number between 1 and 10: " + number);
if (number == 10) {
System.out.println( " Piece made it home successfully");
numWins++;
System.out.println(" Number of times piece made it home successfully " + numWins);
}

How to create a javabean that generate random password?

May i know how to create a javabean that can generate random password?
that include character and string
and length of 10.

i created a class file for my java bean
package autogenerate;
import java.util.*;
public class GeneratePwId
private int MemId;
private String Passwd;
public GeneratePwId(){}
public String getPasswd()
return this.Passwd;
public void setPasswd()
char[] letters = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'J', 'K', 'L', 'M', 'N', 'P', 'R', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c',
'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',
'm', 'n', 'p', 'q', 'r', 's', 't', 'u',
'v', 'w', 'x', 'y', 'z', '0', '1', '2',
'3', '4', '5', '6', '7', '8', '9' } ;
String pwd = "" ;
while( pwd.length() < 10 )
pwd += letters[ (int)( Math.random() * letters.length ) ] ;
this.Passwd = pwd;
i successfully compile my java file. and try to test it by writing a jsp file.
here is my jsp code
<html>
<head>
<title>
Try retrieving password
</title>
</head>
<body>
<jsp:useBean class"autogenerate.GeneratePwId" id="bean0" scope="page"/>
<%=bean0.getPasswd()%>
</body>
</html>
but i encounter this error
org.apache.jasper.compiler.ParseException: /jsp/GetPasswd.jsp(7,18) Attribute class has no value
anyone can teach me how to solve this problem?
thanks a alot!

How do I generate random numbers from a list of numbers without repeating any number

I am trying to generate a list of random numbers without any repeating numbers. For example say the list is from 1 to 15, how do I randomly generate a list of numbers using each number only once?

pb,
You can build a randomizer by making a 2-column table with 15 rows. In Column A, Fill with the numbers 1 to 15. In column B Fill with RAND(). Then sort on Column B. There will now be a randomized list of the numbers from 1 to 15 in Column A. You can copy this random list and use it in your application.
Jerry

How to generate random numbers with a known distribution of f(X)=(8X^2 + 1)*Exp( -X^2 )

Dear All,
I need to simulate a random number generator which can generate numbers X with the probability distribution of
f (X) = ( 8X^2 + 1)*Exp ( -X^2 ).
This distribution is not a common distribution.
I have searched a lot, but I still do not know how to realize it.
Any help on this topic would be highly appreciated.

Make a lookup table of the integral of your function (normalized to 1)
Use the rectangle random generator and pipe that value through the lookup table, scale it ... voila.
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

How to generate random numbers in a range?

Hello. i am having trouble finding out how to generate a random number in a certain range. For example i have an array of 100 elements and i want to access one of the elements between 50 and 60, however i cannot find how to generate a random number between these two values.
Thanks in advance

java.util.Random.nextInt(int)
Note that you can get a number between 0 and (max -
min), exclusive. Then add min, and you've got your
number.Obviously you didn't read this. It says to get a number between 0 and (max - min) which is actually what you did. But after that you need to add min. The first step would get a number in between 0 and 5. When you add 20 you'd get a number between 0+20=20 and 5+20=25.

How to generate random numbers with a known distribution f(X)=(8X^2 + 1)*Exp( -X^2 ).

I need to simulate a random number generator which can generate numbers X with the probability distribution of
f (X) = ( 8X^2 + 1)*Exp ( -X^2 ).
This distribution is not a common distribution.
I have searched a lot, but I still do not know how to realize it.
Thanks a lot!
Solved!
Go to Solution.

Don't forget to index back into the original X array for correctly scaled data. Here's a simple example (LV 8.0):
Seems to work just fine.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
DistributionSimulation.png ‏25 KB
DistributionSim4.vi ‏44 KB

Updating a field that generates random number when form is reset..

I have a field that will generate a random number when the form is initially opened. THis fiekd runs an initialization script of : var randomnumber=Math.floor(math.random()*99999) and then a calculation script of randomnumber.
The field value is set as Calculated - Read Only.
When I hit the Reset button and it clears all the input fields for the form i would like to have it re calculate a new random number. I am not knowledgable in any scripting language and what I have so far I found by searching the forums.
Any help would be appreciated.
Thanks

I don't know if it should matter, but the field to update is on a page other than the one with the reset button. And, the above is not working.
I tried it as you stated above fieldname.rawvalue=randomnumber and I tried pagename.fieldname.rawvalue=randomnumber

Need Query to that generate count of rows of all tables

Hi
i need a query which gives the result of no.of rows in talbe and coresponding table name.
And then i need to compare the same with other DB schema
Thanks in advance

Hi User,
We can also get the count of rows for all the tables associated with a User, we can create a custom function which
uses the table name to return results.
CREATE OR REPLACE FUNCTION TAB_ROWS_CNT (TAB_NAME IN VARCHAR2)
   RETURN NUMBER
AS
   TAB_CNT   NUMBER :=0;
BEGIN
   EXECUTE IMMEDIATE 'select count(*) from ' || TAB_NAME
      INTO TAB_CNT;
   RETURN TAB_CNT;
END;And query,
SELECT TABLE_NAME, TAB_ROWS_CNT (TABLE_NAME) ROW_CNT
FROM USER_TABLES;Which gets us the count of Individual Tables for a user.
This is an just that we can do in this way also. But, use which is optimal.
Thanks,
Shankar

Need An Algorithm That Generates Random Numbers

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