How to implement this equation in matlab,i am basic level?

Answer 1

[Thorsten]

T and Vt can be of arbitrary size and dimensions, as long as both T and Vt have the same size and dimensions.

ind = Rt >= 0;
Rt(ind) = T(ind) - Vt(ind);

You can put that into an infinite loop

 dont_stop = 1;
 while dont_stop
   % copy above code here
 end

that can be stopped typing CRTL-C. But usually you want to define a stop criterium inside the loop.