matlab波形优化算法经常要用到的matlab toolbox工具箱:yalmip

				function x = true(x)
				% TRUE Constrains a variable to be positive
				%
				% TRUE(x) returns the constraint set(x>=1).
				%
				% For safety, it is advised to use the TRUE operator when working with
				% logic constraints, instead of relying on the automatic constraints used
				% by YALMIP (expression generated using AND and OR are automatically
				% assumed to be constrained to be true.
				%
				% SET(a|b) is automatically changed to SET(TRUE(a|b)), or equivalently
				% SET((a|b) >= 1), while SET(a) will be interpreted as SET(a>=0). To
				% constrain a to be true, the user has to explicitely use SET(TRUE(a)).
				%
				%   See also SDPVAR/FALSE, SDPVAR/AND, SDPVAR/OR, SDPVAR/NOT, BINVAR, BINARY
				
				x = set(x>=1);