/sci/ - Science & Math

Does anyone know how to read two summations in this context?

The equation will give me the x1 coordinate, there is a similar equation for the y1 coordinate. The (x,y) in the equations are just the values of the 9x9 array so (0,0) is 600.

I think it's saying that starting at x=0, (the first row), look at the values under it including itself, so 600, 553, 561... 550 and apply the 50(600..550). Then repeat it for the next column where x=1. Same for the denominator. Afterwards I'll get like 9x9 numbers where I then add them all up and I'll get the x1 coordinate?