Difference between revisions of "User talk:Voidious/Optimal Velocity"

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(one-liner for getMaxVelocity)
 
(Added interesting test with Skillgannon's code.)
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</pre>
 
</pre>
 
--[[User:Skilgannon|Skilgannon]] 10:00, 16 July 2009 (UTC)
 
--[[User:Skilgannon|Skilgannon]] 10:00, 16 July 2009 (UTC)
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 +
Hey [[User:Skilgannon|Skilgannon]], I did a test with your one-liner with the formula's on [[Positive/Optimal Velocity]]:
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 +
StartVelocity = 0.0; StartDistance = 6.0;
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<pre>
 +
velocity = 0.0; distance=6.0
 +
velocity = 1.0; distance=5.0
 +
velocity = 2.0; distance=3.0
 +
velocity = 2.0; distance=1.0
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velocity = 1.0; distance=0.0
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</pre>
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StartVelocity = 0.0; StartDistance = 10.0;
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<pre>
 +
velocity = 0.0; distance=10.0
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velocity = 1.0; distance=9.0
 +
velocity = 2.0; distance=7.0
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velocity = 3.0; distance=4.0
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velocity = 3.0; distance=1.0
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velocity = 1.0; distance=0.0
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</pre>
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StartVelocity = -1.9; StartDistance = 10.0;
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<pre>
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velocity = -1.9; distance=10.0
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velocity = 0.10000000000000009; distance=9.9
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velocity = 1.1; distance=8.8
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velocity = 2.1; distance=6.700000000000001
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velocity = 3.1; distance=3.600000000000001
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velocity = 2.0; distance=1.600000000000001
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velocity = 1.600000000000001; distance=0.0
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</pre>
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StartVelocity = 8.0; StartDistance = -2.0;
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<pre>
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velocity = 8.0; distance=-2.0
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velocity = 6.0; distance=-8.0
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velocity = 4.0; distance=-12.0
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velocity = 2.0; distance=-14.0
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velocity = -0.0; distance=-14.0
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velocity = -1.0; distance=-13.0
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velocity = -2.0; distance=-11.0
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velocity = -3.0; distance=-8.0
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velocity = -4.0; distance=-4.0
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velocity = -3.0; distance=-1.0
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velocity = -1.0; distance=0.0
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</pre>
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StartVelocity = 5.0; StartDistance = 40.0;
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<pre>
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velocity = 5.0; distance=40.0
 +
velocity = 6.0; distance=34.0
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velocity = 7.0; distance=27.0
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velocity = 8.0; distance=19.0
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velocity = 7.0; distance=12.0
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velocity = 6.0; distance=6.0
 +
velocity = 4.0; distance=2.0
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velocity = 2.0; distance=0.0
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</pre>
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 +
Your solution and Voidious's one seem to preform about the same. Interesting. :) By the way, I did adjust your function to:
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 +
<pre>
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    private static final double maxVel(double distance){
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    if(distance<0)
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    return -maxVel(-distance);
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    if(distance<=Rules.DECELERATION)
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    return distance;
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        return Math.floor((Math.sqrt(1 + 4*2/Rules.DECELERATION*distance) - 1));
 +
    }
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</pre>
 +
 +
Otherwise it gives nextVel=0.0 on distance==0.6.  --[[User:Positive|Positive]] 10:50, 16 July 2009 (UTC)

Revision as of 11:50, 16 July 2009

I did a quick one-liner which gives almost exactly the same results as your getMaxVelocity(distance): 

       private static final double maxVel(double distance){
         return Math.floor((Math.sqrt(1 + 4*2/Rules.DECELERATION*distance) - 1));
         
      }

The difference is that mine gives integer results, rather than all the 0.5s 0.33333s 0.25s and 0.666667s. 

Distance  Skilgannon    Voidious
0          0.0           0.0
1          1.0           1.0
2          2.0           2.0
3          2.0           2.5
4          3.0           3.0
5          3.0           3.5
6          4.0           4.0
7          4.0           4.333333333333333
8          4.0           4.666666666666667
9          5.0           5.0
10          5.0           5.333333333333333
11          5.0           5.666666666666667
12          6.0           6.0
13          6.0           6.25
14          6.0           6.5
15          6.0           6.75
16          7.0           7.0
17          7.0           7.25
18          7.0           7.5
19          7.0           7.75
20          8.0           8.0

--Skilgannon 10:00, 16 July 2009 (UTC)

Hey Skilgannon, I did a test with your one-liner with the formula's on Positive/Optimal Velocity:

StartVelocity = 0.0; StartDistance = 6.0; 

velocity = 0.0; distance=6.0
velocity = 1.0; distance=5.0
velocity = 2.0; distance=3.0
velocity = 2.0; distance=1.0
velocity = 1.0; distance=0.0

StartVelocity = 0.0; StartDistance = 10.0; 

velocity = 0.0; distance=10.0
velocity = 1.0; distance=9.0
velocity = 2.0; distance=7.0
velocity = 3.0; distance=4.0
velocity = 3.0; distance=1.0
velocity = 1.0; distance=0.0

StartVelocity = -1.9; StartDistance = 10.0; 

velocity = -1.9; distance=10.0
velocity = 0.10000000000000009; distance=9.9
velocity = 1.1; distance=8.8
velocity = 2.1; distance=6.700000000000001
velocity = 3.1; distance=3.600000000000001
velocity = 2.0; distance=1.600000000000001
velocity = 1.600000000000001; distance=0.0

StartVelocity = 8.0; StartDistance = -2.0; 

velocity = 8.0; distance=-2.0
velocity = 6.0; distance=-8.0
velocity = 4.0; distance=-12.0
velocity = 2.0; distance=-14.0
velocity = -0.0; distance=-14.0
velocity = -1.0; distance=-13.0
velocity = -2.0; distance=-11.0
velocity = -3.0; distance=-8.0
velocity = -4.0; distance=-4.0
velocity = -3.0; distance=-1.0
velocity = -1.0; distance=0.0

StartVelocity = 5.0; StartDistance = 40.0; 

velocity = 5.0; distance=40.0
velocity = 6.0; distance=34.0
velocity = 7.0; distance=27.0
velocity = 8.0; distance=19.0
velocity = 7.0; distance=12.0
velocity = 6.0; distance=6.0
velocity = 4.0; distance=2.0
velocity = 2.0; distance=0.0

Your solution and Voidious's one seem to preform about the same. Interesting. :) By the way, I did adjust your function to: 

    private static final double maxVel(double distance){
    	if(distance<0)
    		return -maxVel(-distance);
    	if(distance<=Rules.DECELERATION)
    		return distance;
        return Math.floor((Math.sqrt(1 + 4*2/Rules.DECELERATION*distance) - 1));
     }

Otherwise it gives nextVel=0.0 on distance==0.6. --Positive 10:50, 16 July 2009 (UTC)

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