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: marrmotBMI.m
    path of file: ./repos/MARRMoT/BMI/lib
    
    the code of the file until where you have to start completion: classdef marrmotBMI < BMI
    % MARRMoT m01 implemented as a BMI model
    
    
    properties
        % BMI required
        startTime           % start time
        endTime             % end time
        dt                  % time step size
        time_unit           % units of time
        time = 1;           % current time step
        lat                 % latitude
        lon                 % longitude
        
        % Indepdendent of mo
    
function output = get_var_nbytes(obj,long_var_name)
            switch long_var_name
                case 'P'
                    tmp = obj.forcing.precip;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'T'
                    tmp = obj.forcing.temp;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'Ep'
                    tmp = obj.forcing.pet;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'S(t)'
                    tmp = obj.store_cur;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'mod'
                    tmp = obj.model_name;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'par'
                    tmp = obj.parameters;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'sol'
                    tmp = obj.solver;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'flux_out'
                    tmp = obj.output_externalFluxes;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'flux_in'
                    tmp = obj.output_internalFluxes;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                case 'wb'
                    tmp = obj.output_waterBalance;
                    tmp = whos('tmp');
                    output = tmp.bytes;
                otherwise
                    error('unkown variable');
            end