Hey, is there a link to this program anywhere? I am interested in being a NECROmancer to this program!!! 

For those in FRC, the challenge is complicated: Throw Frisbees accurately into goals.

I found this page that helps a ton with the physics and has an included Java program: http://web.mit.edu/womens-ult/www/smite/frisbee_physics.pdf

Good stuff to know.

I made a few modifications to the program to take input

This is the class with the main method:

package frisbee;

import java.util.Scanner;

public class FrisbeeCalc
{
public static Scanner sc = new Scanner(System.in);
public static Frisbee frisbee = new Frisbee();

public static double y0;
public static double vx0;
public static double vy0;
public static double alpha;
public static double deltaT;

@SuppressWarnings("static-access")
public static void main(String[] args)
{
System.out.print("initial y: ");
y0 = sc.nextDouble();
System.out.print("initial x velocity: ");
vx0 = sc.nextDouble();
System.out.print("initial y velocity: ");
vy0 = sc.nextDouble();
System.out.print("angle: ");
alpha = sc.nextDouble();
System.out.print("delta T: ");
deltaT = sc.nextDouble();

frisbee.simulate(y0, vx0, vy0, alpha, deltaT);
}
}

This is the Frisbee class:

package frisbee;

import java.lang.Math;
/**
* The class Frisbee contains the method simulate which uses Euler’s
* method to calculate the position and the velocity of a frisbee in
* two dimensions.
*
* @author Vance Morrison
* @version March 4, 2005
*/
public class Frisbee
{
    private static double x;
    //The x position of the frisbee.
    private static double y;
    //The y position of the frisbee.
    private static double vx;
    //The x velocity of the frisbee.
    private static double vy;
    //The y velocity of the frisbee.
    private static final double g = -9.81;
    //The acceleration of gravity (m/s^2).
    private static final double m = 0.175;
    //The mass of a standard frisbee in kilograms.
    private static final double RHO = 1.23;
    //The density of air in kg/m^3.
    private static final double AREA = 0.0568;
    //The area of a standard frisbee.
    private static final double CL0 = 0.1;
    //The lift coefficient at alpha = 0.
    private static final double CLA = 1.4;
    //The lift coefficient dependent on alpha.
    private static final double CD0 = 0.08;
    //The drag coefficent at alpha = 0.
    private static final double CDA = 2.72;
    //The drag coefficient dependent on alpha.
    private static final double ALPHA0 = -4;
    /**
    * A method that uses Euler’s method to simulate the flight of a frisbee in
    * two dimensions, distance and height (x and y, respectively).
    *
    */
    public static void simulate(double y0, double vx0, double vy0, double alpha, double deltaT)
    {
        //Calculation of the lift coefficient using the relationship given
        //by S. A. Hummel.
        double cl = CL0 + CLA*alpha*Math.PI/180;
        //Calculation of the drag coefficient (for Prantl’s relationship)
        //using the relationship given by S. A. Hummel.
        double cd = CD0 + CDA*Math.pow((alpha-ALPHA0)*Math.PI/180,2);
        //Initial position x = 0.
        x = 0;
        //Initial position y = y0.
        y = y0;
        //Initial x velocity vx = vx0.
        vx = vx0;
        //Initial y velocity vy = vy0.
        vy = vy0;
        //A loop index to monitor the simulation steps.
        int k = 0;
        //A while loop that performs iterations until the y position
        //reaches zero (i.e. the frisbee hits the ground).
        while(y>0)
        {
            //The change in velocity in the y direction obtained setting the
            //net force equal to the sum of the gravitational force and the
            //lift force and solving for delta v.
            double deltavy = (RHO*Math.pow(vx,2)*AREA*cl/2/m+g)*deltaT;
            //The change in velocity in the x direction, obtained by
            //solving the force equation for delta v. (The only force
            //present is the drag force).
            double deltavx = -RHO*Math.pow(vx,2)*AREA*cd*deltaT;
            //The new positions and velocities are calculated using
            //simple introductory mechanics.
            vx = vx + deltavx;
            vy = vy + deltavy;
            x = x + vx*deltaT;
            y = y + vy*deltaT;
            //Only the output from every tenth iteration will be sent
            //to the spreadsheet so as to decrease the number of data points.
            if(k%10 == 0)
            {
                System.out.println(x + ", " + y + ", " + vx);
            }
            k++;
        }
    }
}

Now, here's the thing: It is a positional equation that takes input velocities, initial y distance, angle, and deltaT (how often the position is calculated)

In the robot design, the angle and initial y distance are constant, and the y distance at the goal is constant. The IV: X distance to goal. The DV: x and y velocities.

I want to make the program so that you input the x distance, and it outputs the velocities necessary.

I'm very rusty on parametric equations, and I need some help in rearranging the equations for the program... Please help if you can.

What is it??? A MOBA, MMO, Online Multiplayer thingymabob?

That's exactly my problem. I really, really wanted to get a Raspberry Pi but I didn't know why (no idea what I'd do with one) so I never did.

EDIT: pimathbrainiac, there's a $25 model.

The $25 doesn't have as many USBs doesn't have an ethernet port

Quote

Lionel : Yes, my plan is to become a pro. So far, I tried C, C++, Java, Lua, TI-8x Basic, Axe, z80 ASM and HP40g Basic.

Good

Quote

I don't really like the Basic languages nor Lua because they're too limited.

The BASIC languages are, indeed, limited. Their goal is ease of use, not computing power / computing efficiency. What's more, calculator BASIC implementations (and the underlying native code routines) are lackluster, be it on the TI-Z80, TI-68k, Nspire or Prizm - they're slow beyond the cost of being high-level interpreted languages, wanting to deal with multiple data types / performing simplifications, etc.
Lua isn't that limited, though. Its popularity is rising, thanks to it being an efficient interpreted language, being easy to program, and being JITable with LuaJIT (though it remains much worse than native code for heavy computation, but nobody in their right mind does such computations in languages other than, basically, C, C++ or Fortran).

Quote

My opinion for Java is more balanced because it's very similar to C++, but VM and no low level capabilities.

Yeah, but it's one of the most widely used languages. Pretty much every professional software developer has to know a bit of Java.
In this day and age, it's also important to do a bit of JavaScript, and know about the frameworks that are all the rage nowadays (Node.js, Backbone.js, etc.). Again, execution efficiency is not the utmost goal with JS; ease of coding is. With those frameworks, it's possible to build nontrivial HTML5 Web apps in a very low number of SLOC.
Another important thing, in my mind, is to spend time reading about trends and technical solutions on the Internet, and using critical thinking about them. The software engineering field is mutating, thanks to the availability of good open-source components: though it remains important to have programming knowledge, it's also important to know the strengths and weaknesses of a wide variety of solutions, and to be able to assemble ready-made pieces instead of reinventing the wheel. Large companies milking other companies, and state agencies, over custom software that is duplicated or exceeded by open source software, are going to have to change their business model ^^

Java is not JS... you know that, right?

Hey, I already wondered this a long time: How do I handle sockets on the server? I know how to do it on the client, and I mean more a general concept, but I put it in C/C++ programming help as for specific code examples i'd be good in C++.
Thanks for any help

Actually, I can't help you... but on Cemetech chat earlier today, there was a discussion about using this with gCn. (there eventually was an argument about programming langs though)

I've done direct linking with the engine, but I don't have two computers to test it on

35$??? Holy Crap!!! ME GUSTA!!!