| |
On Fri, Aug 05, 2005 at 07:25:52PM +0000, Rob Antonishen wrote:
> Using trig, for each value accumulate the sum of the sines and the sum
> of the cosines. Then divide each of these sums by the number of
> entries to get:
> x = average cosine and y = average sine. Then use the arctan2 function
> to get the average angle as: Angle = arctan2( x , y), except this
> fails if x=0 and y=0, as would be the case when trying to average 90
> and 270, sot here is no simple solution to that problem with trig...
>
> So any smart people up to the challenge?
I think using vector math (as you do above) is the right way to go. As
for the special cases, meh, deal with it :)
--
Dan Boger
dan@peeron.com
|
|
Message has 1 Reply:
 | | Re: OT: Math Help
|
| (...) And if you stop and think about it for a second or two, you'll realize your special case really does deserve special consideration. The average is no wind at all, so the direction would be undefined. (19 years ago, 5-Aug-05, to lugnet.org.ca.rtltoronto)
|
Message is in Reply To:
| | OT: Math Help
|
| Figured I'd bounce this problem off the smart people in RTLTotonto...This was posted on an automation mailing list, with little resolution: I have a weather station which measures both the direction and speed of the wind and is connected to a PC to (...) (19 years ago, 5-Aug-05, to lugnet.org.ca.rtltoronto)
|
9 Messages in This Thread:
  
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
