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samer@39
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1 function h=mtimes(f,g)
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samer@12
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2 % compose - Constructs composition of two functions
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samer@12
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3 %
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samer@39
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4 % compose :: (B{:}->C{:}), (A{:}->B{:}) -> (A{:}->C{:}).
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samer@12
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5 %
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samer@12
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6 % returns the function h such that h(...) = f(g(...))
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samer@39
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7 % If functions have multiple returns and arguments, outputs
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samer@39
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8 % from g are routed to f.
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samer@12
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9
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samer@12
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10 h=@fg;
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samer@39
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11 n1=nargout(g); if n1<0, n1=inf; end
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samer@39
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12 n2=nargin(f); if n2<0, n2=inf; end
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samer@39
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13 n3=nargout(f); if n3<0, n3=inf; end
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samer@39
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14 nint=min(n1,n2);
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samer@39
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15 if ~isfinite(nint), error('Cannot determine number of intermediate values'); end
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samer@39
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16
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samer@39
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17 fns = { @q00, @q01, @q0n; @q10, @q11, @q1n; @qn0, @qn1, @qnn };
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samer@39
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18 h=fns{ acount(nint,1)+1, acount(n3,1)+1};
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samer@39
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19
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samer@39
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20 function q00(varargin), g(varargin{:}); f(); end
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samer@39
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21 function q10(varargin), f(g(varargin{:})); end
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samer@39
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22 function qn0(varargin), [y{1:nint}]=g(varargin{:}); f(y{:}); end
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samer@39
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23 function x=q01(varargin), g(varargin{:}); x=f(); end
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samer@39
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24 function x=q11(varargin), x=f(g(varargin{:})); end
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samer@39
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25 function x=qn1(varargin), [y{1:nint}]=g(varargin{:}); x=f(y{:}); end
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samer@39
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26 function varargout=q0n(varargin), g(varargin{:}); [varargout{1:nargout}]=f(); end
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samer@39
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27 function varargout=q1n(varargin), [varargout{1:nargout}]=f(g(varargin{:})); end
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samer@39
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28 function varargout=qnn(varargin), [y{1:nint}]=g(varargin{:}); [varargout{1:nargout}]=f(y{:}); end
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samer@12
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29 end
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