How to apply rotation on last few points ?

Question

Muhammad Iqbal 2020-8-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/580980-how-to-apply-rotation-on-last-few-points

评论： KSSV 2020-8-18

采纳的回答： KSSV

在 MATLAB Online 中打开

I have 5 points but try to rotate the last few points not all

here is the code :

theta = 10;
R = [cosd(theta) -sind(theta) 0 ;
  sind(theta) cosd(theta) 0;
     0 0 1];
initialPoints = [ 0 0 0;
    15 0 0;
    30 0 0;
    45 0 0;
    60 0 0];
Rotation=initialPoints *R; 

the above code work well and rotate all points abut i want to apply rotataion only for last two steps ,can somebody suggest me how can i do that ?

thanks in advance

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Answer 1

KSSV 2020-8-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/580980-how-to-apply-rotation-on-last-few-points#answer_481452

在 MATLAB Online 中打开

To rotate only last two points, you can use.

Rotation=initialPoints(end-2:end,:) *R;

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Muhammad Iqbal 2020-8-18

Hi KSSV;

thanks for your immediate feedback ,it found that the above code vanish the initial points (0 0 0,15 0 0)and rotate the whole road segments ( that contains my points basically )like

i want the ego vehicle move from point A to B in straight initillaly on the road then rotate the road segmemts(contains points) at specific degree so that the ego vehicel also follow the rotated direction

your suggestions will be highly appreciated ,

best regards

KSSV 2020-8-18

在 MATLAB Online 中打开

theta = 10;
R = [cosd(theta) -sind(theta) 0 ;
  sind(theta) cosd(theta) 0;
     0 0 1];
initialPoints = [ 0 0 0;
    15 0 0;
    30 0 0;
    45 0 0;
    60 0 0];
Rotation=initialPoints(end,:)*R; 
R = initialPoints ; 
R(end,:) = Rotation ; 
I = initialPoints ; 
plot(I(:,1),I(:,2),'LineWidth',10) ;
hold on
plot(R(:,1),R(:,2),'LineWidth',10) ;