Southperry.net - Rubik's Cube

I BELIEVE I may have discovered how to successfully utilize "Alchemy"

Mon, 12 Mar 2018 00:59:45 +0000

For example, I throw a green pebble into a body of water..
Later, I find a giant green crystal ball when I look in the right places...
Coincidence? MAYBE, but I think not!
Its been working with so much!

Thermodynamics & Stat. Mech.

Mon, 15 Feb 2016 05:33:00 +0000

If anyone is good at Stat. Mech or Thermodynamics pls look at this and let me know where'd you start.

EDIT: Calling you out [MENTION=3070]Marksman Bryan[/MENTION].

Deriving a linear recurrence equation from a word problem

Sun, 16 Nov 2014 04:48:17 +0000

What I'm having trouble with understanding is finding a recurrence relation from a word problem. I've looked at my notes, but I can't make heads or tails of how my professor and TA got from 1 step to another. I've drawn out a tree of the relationship, but I just don't know where do I go from there?

So take problem 1b for example. What should I be looking out for and how do I approach the problem? I've plotted out terms 0 to 3:

Spoiler

and got 1, 3, 7, 15. I then expressed the groups of 3 I made for n =3 in terms of a previous term (i.e group of 3 under AA is Tn-3, AC is Tn-2, etc, etc), and then summed those up to get the recurrence equation of: Tn = 6Tn-3 + 3Tn-2. And then I'm lost after this. Is what I'm doing even right?

EDIT: I took another swing at it, got: Tn = 2Tn-3 + 2Tn-2 + Tn-1. Brute forced all possible combinations for T4, got 35 terms. My recurrence relation also got me 35. Still kind of lost on why my thought process worked out (break tree diagram of recurrence into groups => get a recurrence equation for each of the groups => adding those recurrences up).

jQuery validation help.

Thu, 07 Aug 2014 09:19:57 +0000

Hey SP,

So I'm working on a web form for a user to update their profile. Im having problems with the validation due to the confusing logic(to me atleast lol).

The form contains a Current Password, New Password & Confirm New Password fields.

In order for the form to be successfully posted, the New Password and Confirm New Password must match(if the user wants to change his password), but it will also be optional and can be left completely blank(if he doesnt want to change his password). On top of that, his current password has to be validated server side to match in the database.

I am using JSON/AJAX and ASP.NET C#.

Trigonometry

Sat, 07 Jun 2014 02:26:54 +0000

This going to sound dumb, but say if I'm given something like cos(nθ, is there any way at all to get the n out?

You see, I'm stuck on my math assignment. It looks like I've almost got it, but I think I may have driven myself into a corner because I have to do the above after reducing powers.

I've never been good at proving trigonometric identities and stuff.

EDIT: Well, at least I'll get half-credit for this assignment. I can do the other half of it, which is to prove the exact same identity with a different method.

HTML/Dreamweaver help?

Thu, 15 May 2014 06:36:14 +0000

Hello folks, I am trying to create angled buttons in Dreamweaver that use a hotspot map for a hoverover, but the image box is screwing with my hotspot. Anyone know how to help?

Here is my site for a visual of whats happening http://jellisarts.com/ the buttons are the ones on the left (derp).

C++ Project, need all the help i can get!

Thu, 01 May 2014 19:18:49 +0000

Hey guys,

It's crunch time for college students, good luck to you all! If any of you have time to help, it would be greatly appreciated. Here's my project:

Program Description: Write a program that calculates the intensity of light onto a NBA basketball court. A standard NBA basketball court is 94 feet long and 50 feet wide. We will assume that every square foot is represented by a cell in a two-dimensional array (or matrix). Given certain criteria that you read in from a data file, you will need to calculate the intensity of light at each square foot of the court.

Your program must have the following 4 functions:
A. Calculate the intensity of light (see formulas below)
B. Calculate the distance from the light to the floor
C. Random number generator
D. Print out the results

Formulas: Fc=Cp/D^2 D=sqrt(b^2+h^2)

Where: Fc = is the level of light the candle (floodlight) produces
D = the distance the lamp is from the surface
Cp = the candle power of the lamp (in watts)
Use the second formula to calculate the distance (D) from the light to each position (cell) on the basketball court.

Here's the data file and what each number/character gives:
Data file:
A
2
G
25 23.5
25 70.5
400
20
B
2
G
25 23.5
25 70.5
1000
30
C
3
R
400
35

What each line means:
o Option letter (to be echoed back out)
o Number of floodlights installed
o Character to determine if the measurements are (G)iven or ®andom. (If random then you need to randomly produce the position of that number of floodlights.)
o For each given floodlight, the number of feet across the court (in the 50 direction) then the number of feet (in the 94 direction)
o Power of the floodlights in watts
o Distance (feet) the lights are mounted above the positions

Here's where I need your help. I'm pretty good with functions and inputting the data from the file, I'm just terrible at arrays. After I calculate the intensity of light(Fc), how do I put these values into an array? Any help with this at all would be greatly appreciated. I need more help with the array part of it, but I could use tips throughout the whole thing. Thank you!

I suck at coding need some help

Sat, 26 Apr 2014 15:14:48 +0000

Okay, so I have to make a code in python that converts from decimal to binary decimal to hexadecimal and lastly from binary to decimal. This is what I have so far:

Decimal to binary

Spoiler

decimal to hexadecimal

Spoiler

Binary to decimal

Spoiler

I try to run these and I keep getting syntax errors so the program won't run and I have no idea how to fix them. So could anyone help me correct them not necessarily do them for me but at least give me a better explanation of where the errors are and what to do to fix them any help at all would be appreciated I'm at my wits end here.

Found this interesting, Atheist on evolution.

Fri, 25 Apr 2014 22:27:55 +0000

http://gbam.tv/question-asked-to-atheist...K.facebook

C++ Programming help needed

Tue, 25 Feb 2014 22:43:47 +0000

Hi all~
I'm having a little trouble coming up with a program for this problem I was assigned. Here is the problem:

A minivan has two sliding doors. Each door can be opened by either a dashboard switch, its inside handle or its outside handle. However, the inside handles do not work if a child lock switch is activated, in order for the sliding doors to open, the gear shift must be in park and the master unlock switch must be activated.
Your task is to simulate a portion of the control software for the vehicle. The input is a sequence of values for the switches and the gear shift, in the following order:
- Dashboard switches for left and right sliding door, child lock and mast lock (0 for off and 1 for activated).
- Inside and outside hands on the left and right doors (1 and 0).
- The gear shift setting (one of P N D 1 2 3 R).

Typical input would be 0 0 0 1 0 1 0 0 P

Print Left door opens and/or right door opens as appropriate. If neither door opens, print both doors stay closed.

So far I have asked for input for the nine boolean things. I'm having trouble coming up with some if and if/else statements. It's quite tough to organize all these combinations and stuff. Anyway, any help would be much appreciated!

Also, sorry for the block of text

Java threads and synchronization

Fri, 21 Feb 2014 00:49:30 +0000

OK, I just don't understand how threads work. I don't know how I'm supposed to wake up a -specific- thread.

I'm working on the implementation of a simple two-player card game. I have five classes: Card, CardDeck, Dealer, Player and CardGame.

First, I ask for keyboard input for two Strings representing the names of the two players. I make two Players based on those names, and make a new CardDeck.

The CardDeck contains an ArrayList of Cards, which are numbered 0-7. There are 4 cards with each number in the deck. The CardDeck is shuffled after its creation.

Then an instance of Dealer takes the top 8 cards off CardDeck and gives each player four of the cards.

Starting with player1, each player draws a card (now having five in their hand). The player's hand is printed out to the console and the player discards one of their cards, aiming to have four cards all with the same value (4 4 4 4, or 0 0 0 0). If player1 doesn't win at this point, player2 takes their turn and vice versa until one player wins.

CardGame acts as the 'main' class and sets everything in motion. It starts three threads (dealer, player1 and player2) and waits for Dealer to give the signal that the game is over, after which it just cleans up and terminates.

CardGame.java

Code:
vpackage matchGame;

import java.util.Scanner;

/**

 * Represents the actual card game. Creates players and deck

 * for Dealer to manipulate. 

 */

public final class CardGame implements Runnable {

    public static void main(String[] args) {

        CardGame game = new CardGame();

        Thread cardGameThread = new Thread(game);

        cardGameThread.start();

    }

    @Override

    public void run() {

        Scanner keyboard = new Scanner(System.in);

        System.out.println("Game started...");

        CardDeck deck = new CardDeck();

        Dealer deal = new Dealer(deck);

        System.out.print("Please enter the player's name: ");

        Player player1 = new Player(keyboard.next(), deck, deal, keyboard);

        System.out.print("Please enter the other player's name: ");

        Player player2 = new Player(keyboard.next(), deck, deal, keyboard);

        deal.setP1(player1);

        deal.setP2(player2);

//        Player threads currently do nothing.

        Thread dealerThread = new Thread(deal);

//        Thread player1Thread = new Thread(player1);

//        Thread player2Thread = new Thread(player2);

        dealerThread.setPriority(10);

//        player1Thread.setPriority(6);

//        player2Thread.setPriority(4);

        dealerThread.start();

//        player1Thread.start();

//        player2Thread.start();

        while(!(deal.isFinished)){

//            Here I would put a wait() function to wait for the

//            dealer thread to finish the game.

        }

        if(player1.hasWon)

            System.out.println(player1.getName() + " is the winner.");

        else if(player2.hasWon)

            System.out.println(player2.getName() + " is the winner.");

//        player1Thread = null;

//        player2Thread = null;

        keyboard.close();

    }

}

Player represents a player and implements Runnable. Each instance has a name and a hand, and a boolean showing whether or not they have won. I also pass in CardDeck and the Scanner object representing the keyboard in order to take keyboard input within the class.

At the moment, the run() method does nothing. This is because I don't know how to implement the multithreading functionality into Player.

Player.java

Code:
package matchGame;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Scanner;

public class Player implements Runnable {

    private final String name;

    public ArrayList hand;

    public final Dealer deal;

    public boolean hasWon;

    private final CardDeck deck;

    private Scanner kb;

    public Player(String name, CardDeck deck, Dealer deal, Scanner kb){

        this.name = name;

        this.hand = new ArrayList();

        this.hasWon = false;

        this.deal = deal;

        this.deck = deck;

        this.kb = kb;

    }

    public String getName(){

        return this.name;

    }

    public void giveCard(Card newCard){

        hand.add(newCard);

    }

    public Card removeCard(int destroyCard) throws Exception{

        Card temp = new Card(destroyCard);

        try{

            if(!(hand.remove(temp)))

                throw new Exception("Specified card is not in your hand!");

        }

        catch(Exception e){

            e.printStackTrace();

        }

        return temp;

    }

    public void sortHand(){

        Collections.sort(hand);

    }

    public String toString(){

        String returnString = "";

        for(Card i : hand)

            returnString += " " + i;

        return returnString;

    }

    @Override

    public void run() {

//        Here I would have a wait() while the dealer deals out cards.

//        I would just have another wait() after that to wait for the player's

//        turn here. This is probably wrong because I would have no way

//        of notifying player1 separately.

    }        

    public synchronized void playTurn(){

        System.out.println(deck);

        System.out.println("---------------------------------------" +

                "----------------------------");

        System.out.println(this.getName() + " is Playing ...");

        giveCard(deck.draw());

        System.out.println(this.getName() + " draws " + hand.get(hand.size() - 1)

                + " from deck.");

        this.sortHand();

        System.out.println(this.getName() + "'s five cards after DRAWING a" +

                " card from deck are: " + this + "(sorted)");

        System.out.print(this.getName() + ": Please discard one of the five cards in your hand: ");

        try {

            int cardToRemove = kb.nextInt();

            for(Card i : hand){

                if(Integer.valueOf(i.toString()) == cardToRemove){

                    cardToRemove = hand.indexOf(i);

                }

            }

            deck.discard(hand.remove(cardToRemove));

        } catch (Exception e) {e.printStackTrace();}

        this.sortHand();

        System.out.println(this.getName() + "'s four cards after DISCARD are: " + this);

        int a = Integer.valueOf(hand.get(0).toString());

        for(Card i : this.hand){

            if(a == Integer.valueOf(i.toString()))

                this.hasWon = true;

            else{

                this.hasWon = false;

                break;

            }

        }

        notify();

    }

}

The code for CardDeck might be necessary for the solution I'm asking for, so here it is. It's a simple ArrayList of instances of Card, and CardDeck contains the methods necessary for drawing cards from the top of the deck and discarding cards to the bottom of the deck.

CardDeck.java

Added the code for Dealer below. Dealer just represents the dealer and has one job: to deal four cards to each player at the beginning of the game. This code is inside its own class because I'm following the instructor (otherwise I'd just have deal() in CardGame).

Dealer pretty much runs the entire game once its thread is started. This is because I haven't figured out the multithreading part of the exercise yet. Preferably, at the very end of Dealer's run() method it would notify CardGame to let it know that the game has finished.

Dealer.java

What's the correct implementation for this? After starting the two Player threads, Player1 should go first immediately. When Player1's turn is done (and Player1 hasn't won yet), Player2 should be notified and Player1 should go to sleep and vice versa. And of course, when either Player1 or Player2 hasWon, the main() thread should keep going.

Any help would be greatly appreciated. I'm just having trouble grasping how this is supposed to work.

A basic Engineering Physics (vectors/forces) problem

Sun, 16 Feb 2014 19:41:49 +0000

Woo, alright. So, I'll throw this out there right off the bat: I'm taking a college level Physics course, but I've had no experience with anything Physics prior. So forgive me if I seem like I don't know what I'm doing (because I probably don't). I have a lab that I'm working on involving forces, and using vectors to graphically depict/analytically calculate said forces. Here is my dilemma:

Given two forces, F1 and F2:

F1 =
Force: 2.452 N
Mass: .25 kg
Direction: 30 degrees

F2 =
Force: 3.433 N
Mass: .35 kg
Direction: 130 degrees

[As cos 130 yields a negative value, I added 90 to it to get my angle measure back into Q1 for a positive value and used that for my calculations]

, I am to find the resultant |R| (its magnitude and direction).

Using the head-to-tail method of moving vectors, I moved F2 on the graph without rotating it to the tail of F1, and constructed |R| by drawing a straight line from the tail of F2 to the head of F1. This forms a triangle (not a right triangle, just a triangle). The first part of this exercise asks me to graphically depict and measure the resultant force. Measuring things out with a ruler and protractor, I come to the result:

|R|:
Force(N) = 3.813 N
Direction: 93.5 degrees.

The next step is to calculate the resultant analytically. The formula below is given to accomplish this:

Rx = ([F1]x+[F2]x) = [F1]cos(angle[F1]) + [F2]cos(angle[F2])
Ry = ([F1]y+[F2]y) = [F1]sin(angle[F1]) + [F2]sin(angle[F2])
|R| = sqrt([Rx]^2+[Ry]^2)

Plugging in my values I get:

Rx = ([F1]x+[F2]x) = [2.452]cos(30) + [3.433]cos(40)
Ry = ([F1]y+[F2]y) = [2.452]sin(30) + [3.433]sin(40)

Rx = 4.7533
Ry = 3.4327
Rx^2 = 22.594
Ry^2 = 11.783

|R| = sqrt([Rx]^2+[Ry]^2)

|R| = sqrt(22.594+11.783)
|R| = sqrt(34.377)
|R| = 5.8632

So, analytically:
|R|:
Force(N) = 5.863 N
Direction: 72.2 degrees.
Mass: 0.60 kg

My analytical and graphical results are extremely different. I can't figure out where I'm going wrong.

Esoterics

Mon, 10 Feb 2014 11:49:00 +0000

So in light of the recent thread about creationist vs evolution, I started thinking about how people view the ideas of the people behind the scenes. Questions like do you think they are just as crazy religious people, do you even think they existed and acted in the capacity people claim the did and do and the like.

I'm referring to influential people in this realm such as Manly P. Hall, Francis Bacon, Benjamin Franklin, Aleister Crowley, Anton Szandor LaVey,the great families who control the federal banks (or who are claimed to control: Goldman Sachs, Rockefellers, Lehmans and Kuhn Loebs of New York; the Rothschilds of Paris and London; the Warburgs of Hamburg; the Lazards of Paris; and the Israel Moses Seifs of Rome).

Do many people even believe the stuff the are suspected of doing or does anyone even care in the first place. I want to get an opinion from the people of southperry since I seen some of your views on science and the like, partly because these influential people admittedly believe in alot more than just science they use it sure, but their ideas and actions go beyond regular thought patterns.

They are many videos you can find on the workings of these people, i'm sure any of you being learned in the ways of the internet can find them if you choose, but I wouldn't mind posting specific videos that claim to expose what these people were/are all about.

Your views gentlemen?

Reflection of a Vector

Sat, 01 Feb 2014 08:01:00 +0000

Ok, Linear Algebra question here. I have no idea what I'm exactly doing wrong, or how everyone else does this. I can't find a good example online that is doing it the way my text book is teaching it.

So here's the problem.

Let L be the line in R^3 that consists of all scalar multiples of
L=

Code:
2

1

2

*this is a 1x3 matrix, not sure how to represent a matrix well on here*

Find the reflection of the vector about the line L.
v=

Code:
1

1

1

*again, 1x3 matrix*

From what I know, I need to find the orthogonal projection of v onto line L, and then use a handy dandy formula.
I know that a projection is equal to ;
(1/||w||^2)w dot w^T

where ||w||^2 is the magnitude of w squared and w^T is w transpose.

So, I'm saying that w is my line, L. Therefore, ||w||^2 = ((2^2 + 1^2 + 2)^1/2)^2 = ((9)^1/2)^2) = 9

hopefully?

and L dot L^T = 3x3 matrix;

Code:
2 4

1 2

2 4

SoOoOOoOo my projection matrix, A, is equal to

(1/9) *

Code:
2 4

1 2

2 4

And my handy dandy formula to find the reflection of a matrix with respect to a line is 2proj(x) - x which is also
2Ax - x
(2A - I)x where I is an identity matrix

preforming this out is definitely not getting me the answer in the back of the book though.

I apologize for this really weird way of typing this out, and I really dunno what I'm seeing incorrectly but it's something massive lol.

Gravity from a mountain observation.

Mon, 13 Jan 2014 06:39:08 +0000

A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 8.00×10−3m/s^2 less than that at sea level.
What is the observatory's altitude?

Given gravity at sea level: 9.83 m/s^2

I used:
G = 6.673 * 10 ^ -11 m^3 kg^-1 s^-2
r = 6.37*10^6 m
mass of the earth = 5.98 *10^24 kg

The equation I used was: g = Gm/(r^2)

How I did the problem:
9.822 = Gm/(r+h)^2
(r+h)^2 = Gm/9.822
h = sqrt(Gm/9.822) - r
The answer I got was 3987 m, while the correct answer is 2590 m. Plugging in their answer I get 9.826 m/s^2, while plugging in my answer gets me 9.822 m/s^2.

Is their answer wrong, or am I using the wrong equation?