# Order Points for plotting

20 views (last 30 days)
Ahmed Abdulla on 24 May 2022
Commented: Ahmed Abdulla on 24 May 2022
I have the coordinates of the above two shapes imported from a CAD software, however when I plot the shape the points are not in order. Is there a method to order the coordinates so that points on the perimeter of the shape that are side by side are next to each other in the matrix.
If there is any mathematical method that would help me, I am willing to understand it and code it myself. Thank you Ahmed Abdulla on 24 May 2022
@Walter Roberson Here I am using a shrink factor of 1 which is the highest I can go :(

KSSV on 24 May 2022
x = A(:,1) ; y = A(:,2) ;
n = length(x) ;
iwant = zeros(n,2) ;
i = 1 ;
iwant(i,:) = [x(i) y(i)] ;
x(i) = [] ; y(i) = [] ;
while ~isempty(x)
i = i+1;
idx = knnsearch([x y],iwant(i-1,:));
iwant(i,:) = [x(idx) y(idx)] ;
x(idx) = [] ; y(idx)= [];
end
iwant(end+1,:) = iwant(1,:) ;
plot(iwant(:,1),iwant(:,2)) Ahmed Abdulla on 24 May 2022
Thank you @KSSV for your efforts I really appreciate it. Unfortunately this doesnt work every time and I am trying to make a generalised function that will work for any shape and at all times

### Categories

Find more on Scopes and Data Logging in Help Center and File Exchange

R2019a

### Community Treasure Hunt

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

Start Hunting!