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: Force.m
    path of file: ./repos/NASTRAN_CoFE/nastran_cofe/cofe_models
    
    the code of the file until where you have to start completion: % Class for point force vectors.
% Anthony Ricciardi
%
classdef Force < Load
    
    properties
        sid % [uint32] Load set identification number.
        g % [uint32] Grid point identification number.
        cid % [uint32] Coordinate system identif
    
function [p_g,gdof]=assemble_sub(obj,model)
            % Outputs
            % gdof [1,3 uint32] index of global degrees of freedom
            % p_g [3,1 double] Force vector expressed in the nodal displacement coordinate system defined at grid points.
            fnode = model.point.getNode(obj.g,model);
            fcsys = model.coordinateSystem.getCoordinateSystem(obj.cid,model);
            gdof = fnode.gdof(1:3);
            p_g = fnode.T_g0*...
                  fcsys.T_c0(fcsys.x_c(fnode.x_0)).'*...
                  obj.f;
        end