cvx_subsref_check.m
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	function s = cvx_subsref_check( nin, nin_norm, S )

	if nin < nin_norm,
	s = 'Not enough input arguments';
	elseif nin == nin_norm,
	if ~isa( S, 'struct' ),
	s = 'Subscript argument to SUBSREF and SUBSASGN must be a structure.';
	else
	Sf = fieldnames( S );
	if length( Sf ) ~= 2,
	s = 'Subscript argument to SUBSREF and SUBSASGN must have two fields.';
	elseif ~isempty( setdiff( { 'type', 'subs' }, Sf ) ),
	s = 'Subscript argument to SUBSREF and SUBSASGN must have two fields whose names are "type" and "subs".';
	elseif isempty( S ),
	s = 'Subscript argument to SUBSREF and SUBSASGN must not be empty.';
	else
	s = '';
	end
	end
	else
	s = '';
	end

	% Copyright 2005-2014 CVX Research, Inc.
	% See the file LICENSE.txt for full copyright information.
	% The command 'cvx_where' will show where this file is located.