[問題] 想請問pfx是什麼 (附數據)
先說好我真的是新手, 不是來亂的.
剛剛在 MLB 板爬到文，提到 pfx 的，說可以去 gameday 找到數據..
只能說 MLB 真的很了不起，為什麼人家在球場上比賽，底下的人可以用一堆科學
儀器測你的數據...
找了很久，找到小小郭這次先發的數據:
http://tinyurl.com/3fhn6w
其中隨便取一段
<pitch des="Ball" type="B" id="5" x="148.50" y="143.33" sv_id="080415_191140"
start_speed="95.0" end_speed="85.5" sz_top="3.546" sz_bot="1.769"
pfx_x="5.702" pfx_z="12.449" px="-1.462" pz="2.636" x0="1.249" y0="50.0"
z0="5.412" vx0="-9.364" vy0="-138.871" vz0="-5.999" ax="10.878" ay="37.795"
az="-8.351" break_y="23.7" break_angle="-39.9" break_length="2.8"
pitch_type="FA" type_confidence="1.4637298330413673" />
當初速是 95 時，末速是 85，然後再看 pfx..(x跟z怎麼看?) 可以得知他的隱形直球
怎麼來的嗎? XD
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