○ <=出手點
○
pFX ○
|<==>|○
●____ ○__<=直直的進壘點
| |
| |
\ /
\ /
我猜測是不是出手點取一條線跟本壘板成垂直(如空白圈)
但是球實際進到進到本壘板是實圈 而這差距就是pFX 變化是水平的
那麼pFY就是上下變化
※ 引述《ohyeaah (..)》之銘言：
: 我理解的感覺是這樣:
:
: ●○ ○ ↓
: ●○ ● ○
: ●○ ● ○
: ●○ ● ○
: ● ● ○ ↓ break
: ●
: ● pFX
: ●
: ● ↑ ↑
:
: 注: 白色為實際軌跡
: 藍色為若球沒旋轉 理論上的軌跡
: ps.第一次畫圖..請鞭小力點 囧
: ※ 引述《Romulus (Säubern Mode)》之銘言：
: : http://gameday.mlblogs.com/
: : Q: What is the PFX value?
: : Q: PFX值是什麼？
: : A: The "Pitch-f/x" value is currently defined as the measurement of the
: : distance between the location of the actual pitch thrown over the plate, and
: : the calculated location of a ball thrown by the pitcher in the same way, with
: : 現在使用的pitch-f/x值定義為實際進壘位置和計算上球無旋轉時進壘位置的距離。
: : no spin; this is the value we provided in Enhanced Gameday last season as
: : "Break". The new Break value, which we feel is more appropriate for the
: : common understanding of the term, is defined as the measurement of the
: : greatest distance between the trajectory of the pitch at any point between
: : the release point and the front of home plate, and the straight line path
: : from the release point and the front of home plate. By this definition, a
: : Barry Zito curveball will have a much greater Break value than a Brad Penny
: : fastball.
: : 以前我們把這叫做break，現在為了符合本詞一般使用習慣，break改為表示理論軌跡和
: : 實際軌跡間任一點的最大距離。
: : 在這定義下，Zito的曲球會有比Penny速球大很多的break值。
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