[R] how to fit y=m*x

[genomenet at gmail.com]

Hi There,

I have a set of data (xi,yi).I want to fit them with the equation
y=mx. 

note: in the above equation, there is no intercept.

I don't know how to use common software such as R , matlab, sas, or
spss to do this kind of regression.

Does anyone know how to do this?

I know it is easy to use least square method to do this by
programming. But I want to find if there exists some common software
which can do this. 

Thank you very much.

Van