Calculate the distance between a point and all the others

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

[Guillaume]

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.

Answer 1

[Guillaume]

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

Answer 2

[Torsten]

Use "pdist".

Best wishes

Torsten.

[Guillaume]

Well, the function to use for the distance is the least of the OP problem. Learning matlab would be required first.