ASK function, this is a block that has three input and one output. the input are the two carrier tha

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关键词: input the function carrier
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				FROM MATLAB 
				
				FUNCTION Add new function.
				    New functions may be added to MATLAB's vocabulary if they
				    are expressed in terms of other existing functions. The 
				    commands and functions that comprise the new function must
				    be put in a file whose name defines the name of the new 
				    function, with a filename extension of '.m'. At the top of
				    the file must be a line that contains the syntax definition
				    for the new function. For example, the existence of a file 
				    on disk called STAT.M with:
				  
				            function [mean,stdev] = stat(x)
				            %STAT Interesting statistics.
				            n = length(x);
				            mean = sum(x) / n;
				            stdev = sqrt(sum((x - mean).^2)/n);
				  
				    defines a new function called STAT that calculates the 
				    mean and standard deviation of a vector. The variables
				    within the body of the function are all local variables.
				    See SCRIPT for procedures that work globally on the work-
				    space. 
				 
				    A subfunction that is visible to the other functions in the
				    same file is created by defining a new function with the FUNCTION
				    keyword after the body of the preceding function or subfunction.
				    For example, avg is a subfunction within the file STAT.M:
				 
				           function [mean,stdev] = stat(x)
				           %STAT Interesting statistics.
				           n = length(x);
				           mean = avg(x,n);
				           stdev = sqrt(sum((x-avg(x,n)).^2)/n);
				 
				           %-------------------------
				           function mean = avg(x,n)
				           %AVG subfunction
				           mean = sum(x)/n;
				 
				    Subfunctions are not visible outside the file where they are defined.
				 
				    You can terminate any function with an END statement but, in most
				    cases, this is optional. END statements are required only in M-files 
				    that employ one or more nested functions. Within such an M-file, 
				    every function (including primary, nested, private, and subfunctions)
				    must be terminated with an END statement. You can terminate any 
				    function type with END, but doing so is not required unless the 
				    M-file contains a nested function.
				 
				    Normally functions return when the end of the function is reached.
				    A RETURN statement can be used to force an early return.
				 
				    See also script, return, varargin, varargout, nargin, nargout, 
				             inputname, mfilename.
				
				    Reference page in Help browser
				       doc function			

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