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* sum up our points: | * sum up our points: | ||
<code>p0 + p1 + p2 + p3 ... = sum</code> | <code> | ||
p0 + p1 + p2 + p3 ... = sum | |||
</code> | |||
* divide the sum by out number of point: | * divide the sum by out number of point: | ||
<code>centroid = sum / num_of_points</code> | <code> | ||
centroid = sum / num_of_points | |||
</code> | |||
== Example Centroid Calculation == | == Example Centroid Calculation == | ||
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Note: We sum up points simply by adding up their x and y values. E.g. | Note: We sum up points simply by adding up their x and y values. E.g. | ||
<code> | <code> | ||
p0 = (1,1), p1= (4,2) | |||
c = p0 + p1; | |||
c = (1,1) + (4,2) = (5,3) | |||
</code> | </code> | ||
Dividing the point by a number, means to divide both dimensions by the same number: | Dividing the point by a number, means to divide both dimensions by the same number: | ||
<code> | <code> | ||
centroid = p2 /3 = (5,3) / 2 = (2.5,1.5) | |||
</code> | </code> | ||