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: techPref.m
    path of file: ./repos/chebfun/@chebtech
    
    the code of the file until where you have to start completion: function outPref = techPref(inPref)
%TECHPREF   Preference settings for CHEBTECH.
%   P = CHEBTECH.TECHPREF() returns a structure P with fields which contain the
%   default CHEBTECH preferences as field/value pairs.  This structure may be
%   passed to the CHEBTECH constructor.
%
%   P = CHEBTECH.TECHPREF(Q) does the same but replaces the default CHEBTECH
%   preferences with the values specified by the field/value pairs in the input
%   structure Q.
%
%   Note that no checking of either the input preference names or values takes

    
function outPref = techPref(inPref)
%TECHPREF   Preference settings for CHEBTECH.
%   P = CHEBTECH.TECHPREF() returns a structure P with fields which contain the
%   default CHEBTECH preferences as field/value pairs.  This structure may be
%   passed to the CHEBTECH constructor.
%
%   P = CHEBTECH.TECHPREF(Q) does the same but replaces the default CHEBTECH
%   preferences with the values specified by the field/value pairs in the input
%   structure Q.
%
%   Note that no checking of either the input preference names or values takes
%   place and that preference names are case-sensitive.
%
%   ABSTRACT PREFERENCES REQUIRED OF ALL TECHS
%
%     chebfuneps          - Relative tolerance used in construction and subsequent
%      [2^-52]       operations.  See CHEBTECH.HAPPINESSCHECK for more details.
%
%     maxLength    - Maximum number of points used by the constructor.
%      [2^16+1]
%
%     fixedLength  - Fixed number of points used by constructor.  NaN allows
%      [NaN]         adaptive construction.
%
%     extrapolate
%       true       - Function values at end