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: YR_colors.m
    path of file: ./repos/lrslibrary/libs/+lightspeed/graphics
    
    the code of the file until where you have to start completion: function colors = YR_colors(n)
% YR_colors    A good sequential colormap.
% YR_colors(n) returns an RGB matrix of n colors (default 64).
% These colors form a sequential colormap (colors easily perceived to lie
% on a sequence).
%
% Example:
%   colormap(YR_colors)
%

    
function colors = YR_colors(n)
% YR_colors    A good sequential colormap.
% YR_colors(n) returns an RGB matrix of n colors (default 64).
% These colors form a sequential colormap (colors easily perceived to lie
% on a sequence).
%
% Example:
%   colormap(YR_colors)
%
% See also YlGnBu_colors

% Written by Tom Minka

if nargin < 1
  n = 64;
end