You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rate.m
    path of file: ./repos/Path-Selection-and-Rate-allocation-in-Self-backhauled-mmWave-Networks
    
    the code of the file until where you have to start completion: function [ c ] = rate( a, b  )
% This function is going to calculate the rate for learning game
power = 10; % Assume that each subflow can use maximum transmit power, i.e., 10 wat

    
function [ c ] = rate( a, b  )
% This function is going to calculate the rate for learning game
power = 10; % Assume that each subflow can use maximum transmit power, i.e., 10 wat
[distance_cal, h]  = topology();
    c = ratecal( power, channel_gain( distance_cal(a,b), h(a,b) ) );

end