problem in getting power information from the given below verilog-AMS code

i want to ask you is how to get power analysis data for verilog AMS code. i have tried with sample code given in cadence LRM but i have n't got any power information the code is given below

 ‘include "disciplines.vams"

module Res(p1, n1);

inout p1, n1;

electrical p1, n1;

parameter real r=5;

analog begin

V(p1,n1) <+ r * I(p1,n1);

$pwr(V(p1,n1)*I(p1,n1));

end

endmodule

when i simulated the above code with the statement options pwr=all it didn't give any power information i tried both dc operating point analysis and transient simulation but both given same result.

Note:code is simulating but power information is not available