Removing row of Matrix under specific condition

Hello,

I've a matrix Nx2 which list a pair of coordinates [x,y] like this [x1 y1;x2 y2;x3 y3;....;xn yn]. I would like to removes the rows were one pair is too close from one other.

The idea is I want to compare on pair of coordinates with all others, and if [xi-xj yi-yj] <[cond1 cond2], then I want to supress this row.

I hope I'm clear engouh, Thanks !

[madhan ravi]

Can you give an example and the required output as numbers so that we can figure it out?

[dpb]

Is it mandatory to use dx, dy as the criterion or would overall d be ok (or what is maybe intended)?

[Stephen23]

Imra's "Answer" moved here:

Hi ! Thanks for asking,

I've a set of coordinate like that : A =[8 10;9 9;9 10;12 12;10 9;13 12;18 24]; For example, I want to keep only those which are separate by at least 2x2 points (To be clear, in practice those coordinate are used to draw a circle, I just dont want to have circle which overlap, so keeping only one).

As often, after posting I had an illumination and did the following thing :

for i=length(A):-1:1
    AA=abs(A(i,:)-A(:,:));
    AA(i,:)=[]; 
    fact_test=find(AA<2);
    if length(fact_test)>1
        A(i,:)=[]
    end
end

I need to test it a bit before i'm sure it works. (Also, I indeed keep one coordinate between other totally arbitrarely).

Answer 1

[Matt J]

You can use uniquetol(...,'ByRows',1)

[Imra]

Hi,

I don't manage to use the function correctly, but when I look at the documentation of it, it seems that the loop I posted earlier do more or the less the same thing, with the 'absolute' tolerance.

Thanks for the function, I didn't know it :) !