精華區beta NY-Yankees 關於我們 聯絡資訊
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: : ※ 引述《logicmana (就是要看棒球)》之銘言: : : 新版的 Gameday 都會有投手每一個球的數據 : : 包含 SPD BRK PFX : : 其中 BRK 是指球於本壘板上空的變化幅度嗎? : : 那另外一個PFX 又是指什麼? : : Swinging Strike 的球大多都是這兩個數字很大 : : 請解惑...謝謝... : 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。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.228.74.170
amax1120:就本文的理解確實好像是這樣子....但是不是很清楚它的意렠 05/04 11:28
yevvi:PFX只是其中一種而已.還有PFY,PX,PY..PFX_x,PFX_z 05/04 11:29
yevvi:來人阿...誰懂這些 05/04 11:29
ynd:上下旋造成壓力差? 而下墬嚴重? 05/04 11:32
ohyeaah:有pFY? 那pFX說不定是縱向 實際值和理論值的距離.. 05/04 11:33
yevvi:http://tinyurl.com/2er6nk 05/04 12:18
yevvi:這篇裡有提到...我也嚇了一跳 05/04 12:18