Calculate the distance between a point and all the others

Question

Marwen Tarhouni 2016-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/314736-calculate-the-distance-between-a-point-and-all-the-others

编辑： Guillaume 2016-11-30

Hi, I try to calculate the distance between a point and all the others. for exemple A(-20,90) B(-24,50) C(-23,90) D(-13,50) E(50,16)

I want to calculate the distance between (A and B) & (A and C) &(A and D) & (A and E)

also (B and A) & (B and C) &(B and D) & (B and E)

do you have an idea ?

x1= -20;
y1=90;
x2=-24;
y2=50;
x3=-23;
y3=90;
x4=-13;
y4=59;
x5= 50;
y6=16;
i=5; 
% for while 
while i<=4
i=i-1;
distance =  sqrt((xi-x1)^2+(yi-y1)^2);    ------------------> error distance???
end

Thanks

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Guillaume 2016-11-30

编辑：Guillaume 2016-11-30

Where have you seen that matlab would magically understand that the i in the variable name xi is supposed to be substituted by the actual value of the variable i in order to make a new variable name?

There is no point in telling you how to calculate the distance if you don't even know how to index in matlab. Please, go through the getting started tutorial.

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Answer 1

Guillaume 2016-11-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/314736-calculate-the-distance-between-a-point-and-all-the-others#answer_245354

在 MATLAB Online 中打开

See comment to question. You need to learn matlab first.

In R2016b, this is very straightforward:

points = [-20, 90;
          -24, 50;
          -23, 90;
          -13, 50; 
           50, 16];
distance = hypot(points(:, 1) - points(1, 1), points(:, 2) - points(1, 2))  %distances to 1st point