MATLAB: Calculate the distance between 2 points

Question

hi every one i want to calculate the distance between 2 points(p1 & p2), so which of the following equation choose to do that:-

d = (x(p1)-x(p2))^2+(y(p1)-y(p2))^2;

or

d = sqrt((x(p1)-x(p2))^2+(y(p1)-y(p2))^2);

or any one from the above equations

thanks

Answer 1

The common use distance formula is the second one:

d = sqrt((x(p1)-x(p2))^2+(y(p1)-y(p2))^2);

http://en.wikipedia.org/wiki/Distance