How to obtain samples within angular windows?

1 次查看（过去 30 天）
OH
OH 2017-1-17
评论： OH 2017-1-21
Hi, Let us say I have a projectile moving around in a square environment and I want to sample all positions where the projectile has travelled within a 20 degrees angular window, as seen from a fixed point in the environment. Can anyone help me figure out how to do this? In the attached picture, the spiral is a made up path of the projectile and the red dot is the fixed point from which I want to make the angular window.
Thanks
  1 个评论
OH
OH 2017-1-18
Ok, so if I construct vectors with 20 degrees separation emanating from the fixed point (as in the picture below), can I then somehow get all the non-NaN elements (i.e where the projectile has been) in the area between two vectors?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Jyotish Robin
Jyotish Robin 2017-1-20
Hi,
Since you are asking for a way in which you can get the non- NaN elements, I suppose you are having a matrix which corresponds to the image. Let me know if that is not the case.
Now, I would suggest you to make use of the function "isnan". isnan(A) returns an array with the same size as A containing logical 1 (true) where the elements of A are NaNs and logical 0 (false) where they are not.
So if it's just a 1D vector ( say y), you can simply do something like this:
>>y1 = y(~isnan(y));
You can read about this in detail in the below link:
https://www.mathworks.com/help/matlab/ref/isnan.html
Hope it helps!!
  3 个评论
显示 1更早的评论
OH
OH 2017-1-21
I would say so.
If one also wants a vector with the sector identity for each
position sample, one may add the following to the example above:
sectorIdentity = (1:n) * sectorgrouping;
Thanks

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by