Random Numbers Question

I'm working from a chapter in Gary Rosenzweig's
ActionScript 3.0 Game Programming University. In this
example 36 random cards are created and placed on the stage. I
understand most of the code except for this line:
thisCard.cardFace = cardList[r]; The line above the one I
just mentioned assigns a random value to r and I don't understand
how the computer knows it's not assigning a value to cardFace that
already exists? Since this function is iterating several times
wouldn't it be possible for one of the random numbers to be
repeated?
Joe

yes, one card is deleted. that card is thisCard.cardFace.
it's just like dealing cards. when you deal an ace of clubs
to someone, that card is removed from the deck. any card dealt
after that is randomly selected from the remaining cards.
the code above is more akin to organizing a deck of cards
with the ace of clubs on top, king of clubs beneath, queen of
clubs,...,2clubs,ace of diamonds,...,2diamonds,...,2spades. then
pick a random number between 1 and 52, select that card number and
remove it from the deck. now pic a random number between 1 and 51
and remove that from the dect. etc.

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can anyone please write up a program that uses an array of random numbers from 0-100 and sort them out...
if anyone can help me that would be great...i tried but i cannot figure it out...
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This has to be the most asked question here, or at least it's way up there with classpath and path questions.
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markpacana,
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If this is a time sensitive-matter, additional support options are available at Contact Us.
Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

How can I generate multiple unique random numbers?

Hello,
I am trying to generate multiple random numbers between a given set of numbers (1-52) and not have the same number generated twice within that set. I can compare the last and next numbers with the compare function but how would I go about comparing all of the generated numbers without using a huge list of shift registers...
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Solved!
Go to Solution.

Here is an implementation of Jason's solution.
steve
Help the forum when you get help. Click the "Solution?" icon on the reply that answers your
question. Give "Kudos" to replies that help.
Attachments:
random.vi ‏10 KB

Figuring out the occurence of random numbers?

So, I'm taking this Computer Science class, and I've been struggling so much with today's lesson.
For this particular question, I have to get 20 random numbers between 1-5, represent them in text format, and the show how often each of the numbers occured. I've done the first two of the three parts, but this last part really has me stumped..
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Here's the code I got so far:
import java.util.*;
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}}

I had a similar assignment my last semester for C++. I would think the general idea is the same.
Here I declare an Array. Then I store the values of the dice rolled in the array and display it on the screen. The syntax will be different since you are not using C++.
#include <iostream>          // preprocessor directive
#include <ctime>          // preprocessor directive
#include <cmath>          // preprocessor directive
#include <cstdlib>          // preprocessor directive
using namespace std;     // enables preprocessor directives
int random_int(int a, int b);          // function prototpye
int main ()     // main function
     srand(time(NULL));          // enables random numbers to be generated
     int d1, d2, sum;                         // declaring variables
     int a[10] = {0,0,0,0,0,0,0,0,0,0};     // initializes valus in array to 0
     int roll;                                   // declaring variable
     cout << "Roll how many times?";          // ask number of times to roll dice
     cin >> roll;                              // get number of times to roll dice
     for(int i=0; i<=roll; i++)               // to roll the dice the numbers or times asked
          d1 = random_int(1,6);               // generates number for die 1
          d2 = random_int(1,6);               // generates number for die 2
          sum = d1 + d2;                         // adds the two dice together
          if(sum == 2)                         // increase value in array by 1 that corresponds to 2
               a[0]++;
          else if(sum==3)                         // increase value in array by 1 that corresponds to 3
               a[1]++;
          else if(sum==4)                         // increase value in array by 1 that corresponds to 4
               a[2]++;
          else if(sum==5)                         // increase value in array by 1 that corresponds to 5
               a[3]++;
          else if(sum==6)                         // increase value in array by 1 that corresponds to 6
               a[4]++;
          else if(sum==7)                         // increase value in array by 1 that corresponds to 7
               a[5]++;
          else if(sum==8)                         // increase value in array by 1 that corresponds to 8
               a[6]++;
          else if(sum==9)                         // increase value in array by 1 that corresponds to 9
               a[7]++;
          else if(sum==10)                    // increase value in array by 1 that corresponds to 10
               a[8]++;
          else if(sum==11)                    // increase value in array by 1 that corresponds to 11
               a[9]++;
          else if(sum==12)                    // increase value in array by 1 that corresponds to 12
               a[10]++;
     for(int j = 2; j<=12; j++)
          cout << j << " " << a[j-2] <<endl;          // output the array
     return 0; //exit program
int random_int(int a, int b)          // used to generate te random numbers
     int random = rand()%(b-a+1) + a;
     return (random);
}

I am trying to generate an array of 30 random numbers. after every 5 readings a new vi should open and tell the user that 5 readings has been completed. and again carry on with the generation of array.

since i do not have a transducer now, i am currently generating an array of 30 random numbers. after every 5 readings a warning should be given to the user that 5 readngs are complete. this cycle should repeat. the array size is 30.
please help me out, waiting for reply asap.
once i have the transducer, i will be taking 30 analog samples and then after every 5 smaples that wraning will be displaye din a new VI
Solved!
Go to Solution.

Use a while loop with a time delay representing your sampling period.
Use the count terminal to check if equals 4, so 4th iteration=5th sample.
Use a case structure. The true case will only be executed on the 4th iteration.
In the true case place a subVI with your desired message in the front panel. Go to the VI properties window and set "open front panel when called".
The closing condition of the warnign is not giving in your description.
Consider that rather than usign a subvi for this, you could use the "One/Two/Three button dialog" or "display message" vis at the "dialog and user interface" pallete.
Please give it a try and send your own VI. Do not expect us to provide a working solution.
Regards,

How can you generate Multiple random numbers from 1 to 49?

I am very new at programming with the iPhone SDK and I need some help with a project I am working on. What I want to do is set up a window with 6 labels and 1 button. When the user clicks the button, the program will populate 6 randomized numbers each ranging from 1 to 49, and then place each of 6 numbers in a label. But each time the program ends and starts again the numbers cannot be the same, and also when the user clicks the button, no label can have the same number twice, so for example. If label 1 had the number 10, the other 5 labels cannot have that number until the button is clicked again. I know how to set up the interface, I just need the code. I would so greatly appreciate someone's help in this matter. I have been trying to do this for days and I cannot figure it out. Possibly someone who knows tons about Objective C programming can help me!
Thank-you so very much!!

I see that you're writing a lottery number generator. Perhaps the easiest way to do it is to emulate a real lottery: fill an array (NSMutableArray, probably) with the numbers between 1 and 49, pick one at random, remove that number from the array, and repeat. (You can think of the numbers as being the balls and the array as being the machine that pops them out.)
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I need help with this program ( Calculating Pi using random numbers)

hi
please understand that I am not trying to ask anymore to do this hw for me. I am new to java and working on the assignment. below is the specification of this program:
Calculate PI using Random Numbers
In geometry the ratio of the circumference of a circle to its diameter is known as �. The value of � can be estimated from an infinite series of the form:
� / 4 = 1 - (1/3) + (1/5) - (1/7) + (1/9) - (1/11) + ...
There is another novel approach to calculate �. Imagine that you have a dart board that is 2 units square. It inscribes a circle of unit radius. The center of the circle coincides with the center of the square. Now imagine that you throw darts at that dart board randomly. Then the ratio of the number of darts that fall within the circle to the total number of darts thrown is the same as the ratio of the area of the circle to the area of the square dart board. The area of a circle with unit radius is just � square unit. The area of the dart board is 4 square units. The ratio of the area of the circle to the area of the square is � / 4.
To simuluate the throwing of darts we will use a random number generator. The Math class has a random() method that can be used. This method returns random numbers between 0.0 (inclusive) to 1.0 (exclusive). There is an even better random number generator that is provided the Random class. We will first create a Random object called randomGen. This random number generator needs a seed to get started. We will read the time from the System clock and use that as our seed.
Random randomGen = new Random ( System.currentTimeMillis() );
Imagine that the square dart board has a coordinate system attached to it. The upper right corner has coordinates ( 1.0, 1.0) and the lower left corner has coordinates ( -1.0, -1.0 ). It has sides that are 2 units long and its center (as well as the center of the inscribed circle) is at the origin.
A random point inside the dart board can be specified by its x and y coordinates. These values are generated using the random number generator. There is a method nextDouble() that will return a double between 0.0 (inclusive) and 1.0 (exclusive). But we need random numbers between -1.0 and +1.0. The way we achieve that is:
double xPos = (randomGen.nextDouble()) * 2 - 1.0;
double yPos = (randomGen.nextDouble()) * 2 - 1.0;
To determine if a point is inside the circle its distance from the center of the circle must be less than the radius of the circle. The distance of a point with coordinates ( xPos, yPos ) from the center is Math.sqrt ( xPos * xPos + yPos * yPos ). The radius of the circle is 1 unit.
The class that you will be writing will be called CalculatePI. It will have the following structure:
import java.util.*;
public class CalculatePI
public static boolean isInside ( double xPos, double yPos )
public static double computePI ( int numThrows )
public static void main ( String[] args )
In your method main() you want to experiment and see if the accuracy of PI increases with the number of throws on the dartboard. You will compare your result with the value given by Math.PI. The quantity Difference in the output is your calculated value of PI minus Math.PI. Use the following number of throws to run your experiment - 100, 1000, 10,000, and 100,000. You will call the method computePI() with these numbers as input parameters. Your output will be of the following form:
Computation of PI using Random Numbers
Number of throws = 100, Computed PI = ..., Difference = ...
Number of throws = 1000, Computed PI = ..., Difference = ...
Number of throws = 10000, Computed PI = ..., Difference = ...
Number of throws = 100000, Computed PI = ..., Difference = ...
* Difference = Computed PI - Math.PI
In the method computePI() you will simulate the throw of a dart by generating random numbers for the x and y coordinates. You will call the method isInside() to determine if the point is inside the circle or not. This you will do as many times as specified by the number of throws. You will keep a count of the number of times a dart landed inside the circle. That figure divided by the total number of throws is the ratio � / 4. The method computePI() will return the computed value of PI.
and below is what i have so far:
import java.util.*;
public class CalculatePI
public static boolean isInside ( double xPos, double yPos )
     double distance = Math.sqrt( xPos * xPos + yPos * yPos );
public static double computePI ( int numThrows )
    Random randomGen = new Random ( System.currentTimeMillis() );
    double xPos = (randomGen.nextDouble()) * 2 - 1.0;
    double yPos = (randomGen.nextDouble()) * 2 - 1.0;
    int hits = 0;
    int darts = 0;
    int i = 0;
    int areaSquare = 4 ;
    while (i <= numThrows)
        if (distance< 1)
            hits = hits + 1;
        if (distance <= areaSquare)
            darts = darts + 1;
        double PI = 4 * ( hits / darts );
        i = i+1;
public static void main ( String[] args )
    Scanner sc = new Scanner (System.in);
    System.out.print ("Enter number of throws:");
    int numThrows = sc.nextInt();
    double Difference = PI - Math.PI;
    System.out.println ("Number of throws = " + numThrows + ", Computed PI = " + PI + ", Difference = " + difference );
}when I tried to compile it says "cannot find variable 'distance' " in the while loop. but i thought i already declare that variable in the above method. Please give me some ideas to solve this problem and please check my program to see if there is any other mistakes.
Thanks a lot.

You've declared a local variable, distance, in the method isInside(). The scope of this variable is limited to the method in which it is declared. There is no declaration for distance in computePI() and that is why the compiler gives you an error.
I won't check your entire program but I did notice that isInside() is declared to be a boolean method but doesn't return anything, let alone a boolean value. In fact, it doesn't even compute a boolean value.

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Program to create random numbers in plsql

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No need to - we have DBMS_RANDOM :)

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John Jamison
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415 392 7243 x 508
[email protected]

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>
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