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parse_fh

PURPOSE ^

returns a function handle from a target (string, function library, or function itself)

SYNOPSIS ^

function fh = parse_fh(target)

DESCRIPTION ^

 returns a function handle from a target (string, function library, or function itself)
 
   fh = parse_fh(target)
 
 if given a string, uses str2func to retrieve function handle
 if given a function handle, returns that function handle
 
 function library: a function that, given an argument, will return the
 function handle for a sub-function of that function.
 
 if given a cell array of 2 strings, parse_fh  will attempt to turn the
 first string into a function handle (str2func) and then will pass the
 second string as an argument to the first string/function, and will
 expect a function handle to return as the first product of this function
 this is the convention that is being used in stimulus selection function
 libraries (see private/matlab/projects/stim_markup/stim_markup_library.m
 for an example)
 
 FB 2009.04.20

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function fh = parse_fh(target)
0002 
0003 % returns a function handle from a target (string, function library, or function itself)
0004 %
0005 %   fh = parse_fh(target)
0006 %
0007 % if given a string, uses str2func to retrieve function handle
0008 % if given a function handle, returns that function handle
0009 %
0010 % function library: a function that, given an argument, will return the
0011 % function handle for a sub-function of that function.
0012 %
0013 % if given a cell array of 2 strings, parse_fh  will attempt to turn the
0014 % first string into a function handle (str2func) and then will pass the
0015 % second string as an argument to the first string/function, and will
0016 % expect a function handle to return as the first product of this function
0017 % this is the convention that is being used in stimulus selection function
0018 % libraries (see private/matlab/projects/stim_markup/stim_markup_library.m
0019 % for an example)
0020 %
0021 % FB 2009.04.20
0022 
0023 if ischar(target)
0024   % target is a string, use str2func
0025   fh = str2func(target);
0026 elseif iscell(target)
0027   % target is a cell ... could this be intended for a function library?
0028   if length(target) ~= 2 || ...
0029           ~ischar(target{1}) || ...
0030           ~ischar(target{2})
0031     error(['must provide library name and sub-function for '...
0032         'function library reference\n']);
0033   end
0034   lfh = str2func(target{1});
0035   fh = lfh(target{2});
0036 elseif isa(target,'function_handle')
0037   fh = target;
0038 else
0039   error(['must provide either a function string, cell array of strings '...
0040       'for a function library call, or a valid function\n']);
0041 end

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