running mean of circular data (angles)

36 次查看（过去 30 天）

Jakob Sievers 2011-10-5

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17491-running-mean-of-circular-data-angles

评论： Walter Roberson 2020-5-7

Hi there

Im trying to do a running mean of a quite large wind-direction data-set but I'm having trouble finding solutions that work. Does anyone know of a simple solution?

Thanks in advance

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Andrei Bobrov 2011-10-5

>> doc mean

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Mark Brandon 2011-10-5

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17491-running-mean-of-circular-data-angles#answer_23580

You could look at the excellent "Circular Statistics Toolbox"

http://www.mathworks.com/matlabcentral/fileexchange/10676

5 个评论
显示 3更早的评论隐藏 3更早的评论

Ana Soph 2020-5-6

how can i use mean angle?
M = xlsread('Dic2019','Dic2019mat')
ten_minute_avarege = meanangle(reshape(M, 10, []), 'omitnan')
xlswrite('datosexcel1.xlsx', ten_minute_avarege, 'Hoja1', 'A1');

Walter Roberson 2020-5-7

I am not aware of any meanangle() function that has 'omitnan' as an option.

请先登录，再进行评论。

更多回答（2 个）

David Young 2011-10-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17491-running-mean-of-circular-data-angles#answer_23578

在 MATLAB Online 中打开

Have a look at

doc unwrap

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Jakob Sievers 2011-10-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17491-running-mean-of-circular-data-angles#answer_23587

The Circular Statistics Toolbox doesnt appear to have a running mean function though. I have used its circ_mean function to make my own running mean but it takes hours to complete its calculation due to the size of the dataset (basically a long vector containing 10 million points).

Does anyone have any other suggestions?

4 个评论
显示 2更早的评论隐藏 2更早的评论

David Young 2011-10-5

Note that unwrap assumes your angles are in radians. If you're using degrees (and from the 360 in your code I think you are), multiply your data by pi/180 before using unwrap. You can convert back afterwards if necessary by multiplying by 180/pi.

Also, perhaps there's a problem with runmean. Maybe you could explain a little more about what this function does, or if it's very short even copy it into your question. (Not into a comment or answer though.)

Jakob Sievers 2011-10-5

Hi David

I just talked with a colleague who said that a 30min mean would be sufficient, meaning that I can make a simple running mean that runs in a 20 seconds or so myself using the circ_mean as described above. Thanks for the help though!

请先登录，再进行评论。

请先登录，再回答此问题。