Java-Gaming.org Hi !
Featured games (81)
games approved by the League of Dukes
Games in Showcase (513)
Games in Android Showcase (119)
games submitted by our members
Games in WIP (576)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  [Scala] Finding the intersect of functions  (Read 372 times)
0 Members and 1 Guest are viewing this topic.
Offline saucymeatman
« Posted 2014-04-07 02:29:20 »

Ok,before someone reminds me that this is JavaGaming.org and not ScalaGaming.org Scala still runs on the JAVA virtual machine, so take that!

Lets say we have two anonymous functions (or lambdas) :
1  
2  
val f1 = (x:Int) => x-1
val f2 = (x:Int) => -x+1

How do we find the value of x that will result in the same output?

So the method signature would look somthing like this :
1  
2  
type Function = Int => Int
def intercept(a:Function, b:Function):Int = ????????
Offline Riven
« League of Dukes »

JGO Overlord


Medals: 816
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2014-04-07 05:34:53 »

This is math problem.

Each function results in a straight line. Just find the intersection-point, if any.

Hi, appreciate more people! Σ ♥ = ¾
Learn how to award medals... and work your way up the social rankings
Offline Roquen
« Reply #2 - Posted 2014-04-07 08:42:35 »

{x->1}...can scala do exp rewritting?
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline Danny02
« Reply #3 - Posted 2014-04-07 08:50:09 »

Let's say that you don't know anything about these functions (linear, quadratic whatever). You can than do a numerical approximation, most of the time in an iterative fashion.
The most common method was invented by Newton.

So you would subtract one of the function from the over and then with the help of the above method approximated the intersection point.
Offline Roquen
« Reply #4 - Posted 2014-04-07 08:51:25 »

How do you automatically get the derivate? (Or can scala replace types so you can use dual numbers?)
Offline Danny02
« Reply #5 - Posted 2014-04-07 08:53:05 »

dunno, calculate the tangent yourself with a small sample size.


ps: you can probably write a solver macro to do all the hard work at compile time Cheesy
Offline Roquen
« Reply #6 - Posted 2014-04-07 08:54:37 »

The example isn't really clear...like is the field of integers only of interest?  Wait scratch that...what do you really want to do?
Offline saucymeatman
« Reply #7 - Posted 2014-04-07 10:56:40 »

Let's say that you don't know anything about these functions (linear, quadratic whatever).Newton.
This is what I meant sorry.
Ill look into this method.
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

Longarmx (41 views)
2014-10-17 03:59:02

Norakomi (33 views)
2014-10-16 15:22:06

Norakomi (26 views)
2014-10-16 15:20:20

lcass (30 views)
2014-10-15 16:18:58

TehJavaDev (59 views)
2014-10-14 00:39:48

TehJavaDev (60 views)
2014-10-14 00:35:47

TehJavaDev (50 views)
2014-10-14 00:32:37

BurntPizza (66 views)
2014-10-11 23:24:42

BurntPizza (38 views)
2014-10-11 23:10:45

BurntPizza (80 views)
2014-10-11 22:30:10
Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50

List of Learning Resources
by SilverTiger
2014-07-31 16:26:06
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!