My Math Forum How many rounds?

 Applied Math Applied Math Forum

 July 5th, 2017, 02:48 AM #1 Newbie   Joined: Jun 2017 From: italia Posts: 13 Thanks: 2 How many rounds? A particle is moving along a circle CCW with almost constant speed. I sample the x and y coordinates of the particle to get a point every degree or so (usually 1 point every 0.5 to 1.5 degrees). Since I need to stop the sampling after a given number of rounds, I need to count how many rounds the particle has done so far.
 July 5th, 2017, 03:41 AM #2 Global Moderator   Joined: Dec 2006 Posts: 19,525 Thanks: 1748 Do you mean you want to count the number of completed rounds?
 July 5th, 2017, 05:24 AM #3 Newbie   Joined: Jun 2017 From: italia Posts: 13 Thanks: 2 Yep! (Sorry for my English.)
 July 5th, 2017, 10:25 AM #4 Senior Member   Joined: Aug 2012 Posts: 2,007 Thanks: 574 If the motion is always in the same direction, you can tell that it's gone around once when it appears to go backwards. In other words if the angle (between the ray from the origin to your point, and the positive x-axis) decreases. In other words if the angle is 45 degrees on one measurement and 44 degrees on the next, it must have gone around 359 degrees.

 Tags rounds

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post Appiani Linear Algebra 0 December 10th, 2015 02:40 AM yudencow Number Theory 2 December 19th, 2012 08:43 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top