I have matrix F (x,y coordinates), which is 1000*2 matrix. i calculated distances between coordinates using PDIST2 command. i want coordinates which are at distance greater than 22?

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M.Prasanna kumar 2019-2-4

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评论： M.Prasanna kumar 2019-2-6

F = [x5;y5]'; % x,y coordinates
distances = pdist2(F,F); %% claculating distances between every coordinate to all other coodinates
closepoints = distances > 22;  %% checking the condition
result = find(closepoints==1); %% 

based on the logical condition how to get the coordinates (x,y) which are grater than 22

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madhan ravi 2019-2-4

So you want to obtain the x and y coordinates when distance is greater than 22 ?

M.Prasanna kumar 2019-2-4

thank you sir, i got the answer

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采纳的回答

Akira Agata 2019-2-4

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One possible solution would be like this:

F = [x5;y5]'; % x,y coordinates
D = pdist(F); % pdist function is suitable in this case
idx = squareform(D) > 22;
[p1,p2] = find(triu(idx));

Then, F(p1(i),:) and F(p2(i),:) (for i = 1, ..., numel(p1)) will give the coordinates (x1,y1) and (x2,y2) whose distance are grater than 22.

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M.Prasanna kumar 2019-2-6

编辑：M.Prasanna kumar 2019-2-6

coordinate A(x1,y1)

coordinate B(x2,y2)

coordinate C(x3,y3)

coordinate D(x4,y4)

and so on

distance between A to B, A to C and A to D should be greater than 22

distance between B to A, B to C and B to D should be greater than 22

distance between C to A, C to B and C to D should be greater than 22

distance between D to A, D to B and D to C should be greater than 22

and so on

like that how many such coordinates are possible . i want all such coordinates

for example:

In the above graph coordinate B voilates the condition i explainbed above, where as if we remove coordinate B from graph Coordnates A,B,C satisfies the condition i explained above.

M.Prasanna kumar 2019-2-6

In your case F is 4*2, out of four coordinates 3 coordinates are satisfying the condition (all possible distances between every coordinate to all other coordintes is greater than 22)

suppose In my case F is 1000*2 (randomly generated ) . out ofthousand how many such possible coordinates will satisfy the condition

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