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: draw_line_clip.m
    path of file: ./repos/lrslibrary/libs/+lightspeed/graphics
    
    the code of the file until where you have to start completion: function h = draw_line_clip(m,b,a, linespec, varargin)
%DRAW_LINE_CLIP  Draw a line defined by an equation.
% DRAW_LINE_CLIP(M,B,A) draws a line, clipped to the current axes, 
% defined by a*y = m*x + b.

    
function h = draw_line_clip(m,b,a, linespec, varargin)
%DRAW_LINE_CLIP  Draw a line defined by an equation.
% DRAW_LINE_CLIP(M,B,A) draws a line, clipped to the current axes, 
% defined by a*y = m*x + b.
% DRAW_LINE_CLIP(M,B,A,LINESPEC) also specifies the line style and color.

if nargin < 4
  linespec = 'b';
end