hi, I am a pitch f/x mania from South Korea.
I'm really impressed by your post about Chien-Ming Wang(I also a huge fan of Wang).
IF... you don't mind, could you tell me how to draw the chart like that? especially the speed-spinrate system... I cannot plot like that by excel.. :'(
all of your plots are excellent...!
have a nice day!
Thank you for your encouragement. It’s been a pleasure to meet and learn much from PITCHf/x maniac all over the world, especially another Chien-Ming Wang fan. Welcome. Your PITCHf/x blog fulls of so many interesting analyses and in-depth reports. My appreciation is beyond language barriers.
Those polar plots for spin rate & spin axis direction were drawn by "KaleidaGraph", a data analysis and graphing software. KaleidaGraph provides several graphic functions for statistical purpose. However, we can produce similar polar plot just by Excel. All you need is following coordinate transformation:
x = spin rate * cos (φ/360 * 2π)
y = spin rate * sin (φ/360 * 2π)
And then draw a x-y graph by these (x, y) coordinates. Take Wang’s PITCHf/x data of "Game@TB, 2008/05/13" for example:
Hope this would be helpful. Enjoy it. Have a nice (game)day.