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I am writing a code in C++ and want to compute distance between two points. Question 1:
I have two points P(x1, y1, z1) and Q(x2, y2, z2) , where x, y and z are floats/doubles.
I want to find the distance between these two points. One way to do it is :
square_root(x_diffx_diff + y_diffy_diff + z_diff*z_diff)
But this is probably not the most efficient way . (e.g. a better formula or a ready made utility in math.h etc )
Question 2:
Is there a better way if I just want to determine if P and Q are in fact the same points?
My inputs are x, y and z coordinates of both the points.
Thank you
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To find the distance between two points, take the coordinates of two points such as (x1, y1) and (x2, y2) Use the distance formula (i.e) square root of (x2 – x1)2 + (y2 – y1) For this formula, calculate the horizontal and vertical distance between two points.
You know that the distance AB between two points in a plane with Cartesian coordinates A(x1,y1) and B(x2,y2) is given by the following formula: AB=√(x2−x1)2+(y2−y1)2.
Do you need the actual distance? You could use the distance squared to determine if they are the same, and for many other purposes. (saves on the sqrt operation)
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