Sum of series in matlab

I have 27 points x and y coordinates. I write these as a R matrix, R=[X;Y]. I want to make this process, but i dont know how can you help me?

[James Tursa]

Is this homework? Do you have to use a for-loop?

[Rana Önem]

yeah i need to use for loop i think it is the best

Answer 1

[James Tursa]

You could use a simple matrix multiply for this (it looks like the x is the first row and the y is the second row):

A = R(1,1:27) * R(2,2:28).';