Matrix dimensions must agree.

Hi all, first time user and I have only started to use matlab recently.
I need help with making matrix's dimensions agree.
I am using the following formula: E = -(G*M/R^2)*(Y1/R) where R = sqrt(Y1^.2 +Y2.^2)
the following occurs when i try and find E

??? Error using ==> mldivide
Matrix dimensions must agree.

Error in ==> Eastward_easy at 4
E = -(G*M/R.^2)

How do I get the matrix's to agree?
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