function [varargout] = lookfor(varargin)
%LOOKFOR Search all M-files for keyword.
%   LOOKFOR XYZ looks for the string XYZ in the first comment line
%   (the H1 line) of the HELP text in all M-files found on MATLABPATH.
%   For all files in which a match occurs, LOOKFOR displays the H1 line.
%
%   For example, "lookfor inverse" finds at least a dozen matches,
%   including the H1 lines containing "inverse hyperbolic cosine"
%   "two-dimensional inverse FFT", and "pseudoinverse".
%   Contrast this with "which inverse" or "what inverse", which run
%   more quickly, but which probably fail to find anything because
%   MATLAB does not ordinarily have a function "inverse".
%
%   LOOKFOR XYZ -all  searches the entire first comment block of
%   each M-file.
%
%   In summary, WHAT lists the functions in a given directory,
%   WHICH finds the directory containing a given function or file, and
%   LOOKFOR finds all functions in all directories that might have
%   something to do with a given key word.
%
%   See also DIR, HELP, WHO, WHAT, WHICH.

%   Copyright 1984-2003 The MathWorks, Inc.
%   $Revision: 1.1.6.3 $  $Date: 2004/04/10 23:29:37 $
%   Built-in function.

if nargout == 0
  builtin('lookfor', varargin{:});
else
  [varargout{1:nargout}] = builtin('lookfor', varargin{:});
end