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sfun_vargain.m in SIMULINK.rar

			
function [sys,x0,str,ts] = sfun_vargain(t,x,u,flag,gain)

%multiplies the input signal by a variable gain.

switch flag,

  case 0,
    [sys,x0,str,ts]=mdlInitializeSizes;

  case 1,
    sys=mdlDerivatives(t,x,u);

  case 2,
    sys=mdlUpdate(t,x,u);

  case 3,
    sys=mdlOutputs(t,x,u,gain);

  case 4,
    sys=mdlGetTimeOfNextVarHit(t,x,u);

  case 9,
    sys=mdlTerminate(t,x,u);

  otherwise
    error(['Unhandled flag = ',num2str(flag)]);

end

function [sys,x0,str,ts]=mdlInitializeSizes(initial_state)

sizes = simsizes;

sizes.NumContStates  = 0;
sizes.NumDiscStates  = 0;
sizes.NumOutputs     = 1;
sizes.NumInputs      = 1;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1;   % at least one sample time is needed

sys = simsizes(sizes);

%
% initialize the initial conditions
%
x0  = [];

%
% str is always an empty matrix
%
str = [];

%
% initialize the array of sample times
%
ts  = [0 0];

% end mdlInitializeSizes

%
%=============================================================================
% mdlDerivatives
% Return the derivatives for the continuous states.
%=============================================================================
%
function sys=mdlDerivatives(t,x,u)

sys = [];

% end mdlDerivatives

%
%=============================================================================
% mdlUpdate
% Handle discr			

			...
			...
			... to be continued.

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