yuelingchi 发表于 2007-7-11 15:49

svpwm s函数语句问题

麻烦大家 帮我看看下面这个s函数
我想要生成svpwm
结果建立函数模块的时候
总是报错
说是 倒数第三行的function位置不对或者错误嵌套
我都没动过这个函数
是不是我的if语句用的不对?
谢谢大家拉!!!




function = svpwm_2(t,x,u,flag)
%SFUNTMPL General M-file S-function template
%   With M-file S-functions, you can define you own ordinary differential
%   equations (ODEs), discrete system equations, and/or just about
%   any type of algorithm to be used within a Simulink block diagram.
%
%   The general form of an M-File S-function syntax is:
%       = SFUNC(T,X,U,FLAG,P1,...,Pn)
%
%   What is returned by SFUNC at a given point in time, T, depends on the
%   value of the FLAG, the current state vector, X, and the current
%   input vector, U.
%
%   FLAG   RESULT             DESCRIPTION
%   -----------             --------------------------------------------
%   0      Initialization, return system sizes in SYS,
%                           initial state in X0, state ordering strings
%                           in STR, and sample times in TS.
%   1      DX               Return continuous state derivatives in SYS.
%   2      DS               Update discrete states SYS = X(n+1)
%   3      Y                  Return outputs in SYS.
%   4      TNEXT            Return next time hit for variable step sample
%                           time in SYS.
%   5                         Reserved for future (root finding).
%   9      []               Termination, perform any cleanup SYS=[].
%
%
%   The state vectors, X and X0 consists of continuous states followed
%   by discrete states.
%
%   Optional parameters, P1,...,Pn can be provided to the S-function and
%   used during any FLAG operation.
%
%   When SFUNC is called with FLAG = 0, the following information
%   should be returned:
%
%      SYS(1) = Number of continuous states.
%      SYS(2) = Number of discrete states.
%      SYS(3) = Number of outputs.
%      SYS(4) = Number of inputs.
%               Any of the first four elements in SYS can be specified
%               as -1 indicating that they are dynamically sized. The
%               actual length for all other flags will be equal to the
%               length of the input, U.
%      SYS(5) = Reserved for root finding. Must be zero.
%      SYS(6) = Direct feedthrough flag (1=yes, 0=no). The s-function
%               has direct feedthrough if U is used during the FLAG=3
%               call. Setting this to 0 is akin to making a promise that
%               U will not be used during FLAG=3. If you break the promise
%               then unpredictable results will occur.
%      SYS(7) = Number of sample times. This is the number of rows in TS.
%
%
%      X0   = Initial state conditions or [] if no states.
%
%      STR    = State ordering strings which is generally specified as [].
%
%      TS   = An m-by-2 matrix containing the sample time
%               (period, offset) information. Where m = number of sample
%               times. The ordering of the sample times must be:
%
%               TS = [0      0,      : Continuous sample time.
%                     0      1,      : Continuous, but fixed in minor step
%                                    sample time.
%                     PERIOD OFFSET, : Discrete sample time where
%                                    PERIOD > 0 & OFFSET < PERIOD.
%                     -2   0];   : Variable step discrete sample time
%                                    where FLAG=4 is used to get time of
%                                    next hit.
%
%               There can be more than one sample time providing
%               they are ordered such that they are monotonically
%               increasing. Only the needed sample times should be
%               specified in TS. When specifying than one
%               sample time, you must check for sample hits explicitly by
%               seeing if
%                  abs(round((T-OFFSET)/PERIOD) - (T-OFFSET)/PERIOD)
%               is within a specified tolerance, generally 1e-8. This
%               tolerance is dependent upon your model's sampling times
%               and simulation time.
%
%               You can also specify that the sample time of the S-function
%               is inherited from the driving block. For functions which
%               change during minor steps, this is done by
%               specifying SYS(7) = 1 and TS = [-1 0]. For functions which
%               are held during minor steps, this is done by specifying
%               SYS(7) = 1 and TS = [-1 1].
%   Copyright 1990-2002 The MathWorks, Inc.
%   $Revision: 1.18 $
%
% The following outlines the general structure of an S-function.
%
n=u(1);
tt=u(2);
t0=u(3);
t1=u(4);
t2=u(5);
t7=u(6);

switch flag,
%%%%%%%%%%%%%%%%%%
% Initialization %
%%%%%%%%%%%%%%%%%%
case 0,
    =mdlInitializeSizes(n,tt,t0,t1,t2,t7);
%%%%%%%%%%%%%%%
% Derivatives %
%%%%%%%%%%%%%%%
case 1,
    sys=mdlDerivatives(t,x,u);
%%%%%%%%%%
% Update %
%%%%%%%%%%
case 2,
    sys=mdlUpdate(t,x,u);
%%%%%%%%%%%
% Outputs %
%%%%%%%%%%%
case 3,
    sys=mdlOutputs(t,x,u);
%%%%%%%%%%%%%%%%%%%%%%%
% GetTimeOfNextVarHit %
%%%%%%%%%%%%%%%%%%%%%%%
case 4,
    sys=mdlGetTimeOfNextVarHit(t,x,u);
%%%%%%%%%%%%%
% Terminate %
%%%%%%%%%%%%%
case 9,
    sys=mdlTerminate(t,x,u);
%%%%%%%%%%%%%%%%%%%%
% Unexpected flags %
%%%%%%%%%%%%%%%%%%%%
otherwise
    error(['Unhandled flag = ',num2str(flag)]);
end
% end sfuntmpl
%
%=============================================================================
% mdlInitializeSizes
% Return the sizes, initial conditions, and sample times for the S-function.
%=============================================================================
%
function =mdlInitializeSizes
%
% call simsizes for a sizes structure, fill it in and convert it to a
% sizes array.
%
% Note that in this example, the values are hard coded.This is not a
% recommended practice as the characteristics of the block are typically
% defined by the S-function parameters.
%
sizes = simsizes;
sizes.NumContStates= 0;
sizes.NumDiscStates= 0;
sizes.NumOutputs   = 3;
sizes.NumInputs      = 6;
sizes.DirFeedthrough = 0;
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= ;
% end mdlInitializeSizes
%
%=============================================================================
% mdlDerivatives
% Return the derivatives for the continuous states.
%=============================================================================
%
function sys=mdlDerivatives(t,x,u)
sys = [];
% end mdlDerivatives
%
%=============================================================================
% mdlUpdate
% Handle discrete state updates, sample time hits, and major time step
% requirements.
%=============================================================================
%
function sys=mdlUpdate(t,x,u)
sys = [];
% end mdlUpdate
%
%=============================================================================
% mdlOutputs
% Return the block outputs.
%=============================================================================
%
function sys=mdlOutputs(t,x,u,n,tt,t0,t1,t2,t7)
   
if n==1
   if t>=tt&t<tt+t0/2
sys=;
else if t>=tt+t0/2&t<tt+t0/2+t1/2
sys=;
else if t>=tt+t0/2+t1/2&t<tt+t0/2+t1/2+t2/2
sys=;
else if t>=tt+t0/2+t1/2+t2/2&t<tt+t0/2+t1/2+t2/2+t7
sys=;
else if t>=tt+t0/2+t1/2+t2/2+t7&t<tt+t0/2+t1/2+t2+t7
sys=;
else if t>=tt+t0/2+t1/2+t2+t7&t<tt+t0/2+t1+t2+t7
sys=;
else
sys=;

if n==2
if t>=tt&t<tt+t7/2
sys=;
else if t>=tt+t7/2&t<tt+t7/2+t1/2
sys=;
else if t>=tt+t7/2+t1/2&t<tt+t7/2+t1/2+t2/2
sys=;
else if t>=tt+t7/2+t1/2+t2/2&t<tt+t7/2+t1/2+t2/2+t0
sys=;
else if t>=tt+t7/2+t1/2+t2/2+t0&t<tt+t7/2+t1/2+t2+t0
sys=;
else if t>=tt+t7/2+t1/2+t2+t0&t<tt+t7/2+t1+t2+t0
sys=;
else
sys=;
if n==3
if t>=tt&t<tt+t0/2
sys=;
else if t>=tt+t0/2&t<tt+t0/2+t1/2
sys=;
else if t>=tt+t0/2+t1/2&t<tt+t0/2+t1/2+t2/2
sys=;
else if t>=tt+t0/2+t1/2+t2/2&t<tt+t0/2+t1/2+t2/2+t7
sys=;
else if t>=tt+t0/2+t1/2+t2/2+t7&t<tt+t0/2+t1/2+t2+t7
sys=;
else if t>=tt+t0/2+t1/2+t2+t7&t<tt+t0/2+t1+t2+t7
sys=;
else
sys=;
if n==4
if t>=tt&t<tt+t7/2
sys=;
else if t>=tt+t7/2&t<tt+t7/2+t1/2
sys=;
else if t>=tt+t7/2+t1/2&t<tt+t7/2+t1/2+t2/2
sys=;
else if t>=tt+t7/2+t1/2+t2/2&t<tt+t7/2+t1/2+t2/2+t0
sys=;
else if t>=tt+t7/2+t1/2+t2/2+t0&t<tt+t7/2+t1/2+t2+t0
sys=;
else if t>=tt+t7/2+t1/2+t2+t0&t<tt+t7/2+t1+t2+t0
sys=;
else
sys=;
if n==5
if t>=tt&t<tt+t0/2
sys=;
else if t>=tt+t0/2&t<tt+t0/2+t1/2
sys=;
else if t>=tt+t0/2+t1/2&t<tt+t0/2+t1/2+t2/2
sys=;
else if t>=tt+t0/2+t1/2+t2/2&t<tt+t0/2+t1/2+t2/2+t7
sys=;
else if t>=tt+t0/2+t1/2+t2/2+t7&t<tt+t0/2+t1/2+t2+t7
sys=;
else if t>=tt+t0/2+t1/2+t2+t7&t<tt+t0/2+t1+t2+t7
sys=;
else
sys=;

if n==6
if t>=tt&t<tt+t7/2
sys=;
else if t>=tt+t7/2&t<tt+t7/2+t1/2
sys=;
else if t>=tt+t7/2+t1/2&t<tt+t7/2+t1/2+t2/2
sys=;
else if t>=tt+t7/2+t1/2+t2/2&t<tt+t7/2+t1/2+t2/2+t0
sys=;
else if t>=tt+t7/2+t1/2+t2/2+t0&t<tt+t7/2+t1/2+t2+t0
sys=;
else if t>=tt+t7/2+t1/2+t2+t0&t<tt+t7/2+t1+t2+t0
sys=;
   else
sys=;
      end


% end mdlOutputs
%
%=============================================================================
% mdlGetTimeOfNextVarHit
% Return the time of the next hit for this block.Note that the result is
% absolute time.Note that this function is only used when you specify a
% variable discrete-time sample time [-2 0] in the sample time array in
% mdlInitializeSizes.
%=============================================================================
%
% end mdlGetTimeOfNextVarHit
%
%=============================================================================
% mdlTerminate
% Perform any end of simulation tasks.
%=============================================================================
%
function sys=mdlTerminate(t,x,u)
sys = []; % end mdlTerminate
% end mdlTerminate

wenchx 发表于 2007-8-22 15:36

if 与and 不匹配

wenchx 发表于 2007-8-24 11:37

回复 #2 wenchx 的帖子

你的这个函数中,输入量tt是什么意思,t是指当前仿真时间吗

witty01 发表于 2007-8-24 16:20

function = svpwm_2(t,x,u,flag)
%SFUNTMPL General M-file S-function template
%   With M-file S-functions, you can define you own ordinary differential
%   equations (ODEs), discrete system equations, and/or just about
%   any type of algorithm to be used within a Simulink block diagram.
%
%   The general form of an M-File S-function syntax is:
%       = SFUNC(T,X,U,FLAG,P1,...,Pn)
%
%   What is returned by SFUNC at a given point in time, T, depends on the
%   value of the FLAG, the current state vector, X, and the current
%   input vector, U.
%
%   FLAG   RESULT             DESCRIPTION
%   -----------             --------------------------------------------
%   0      Initialization, return system sizes in SYS,
%                           initial state in X0, state ordering strings
%                           in STR, and sample times in TS.
%   1      DX               Return continuous state derivatives in SYS.
%   2      DS               Update discrete states SYS = X(n+1)
%   3      Y                  Return outputs in SYS.
%   4      TNEXT            Return next time hit for variable step sample
%                           time in SYS.
%   5                         Reserved for future (root finding).
%   9      []               Termination, perform any cleanup SYS=[].
%
%
%   The state vectors, X and X0 consists of continuous states followed
%   by discrete states.
%
%   Optional parameters, P1,...,Pn can be provided to the S-function and
%   used during any FLAG operation.
%
%   When SFUNC is called with FLAG = 0, the following information
%   should be returned:
%
%      SYS(1) = Number of continuous states.
%      SYS(2) = Number of discrete states.
%      SYS(3) = Number of outputs.
%      SYS(4) = Number of inputs.
%               Any of the first four elements in SYS can be specified
%               as -1 indicating that they are dynamically sized. The
%               actual length for all other flags will be equal to the
%               length of the input, U.
%      SYS(5) = Reserved for root finding. Must be zero.
%      SYS(6) = Direct feedthrough flag (1=yes, 0=no). The s-function
%               has direct feedthrough if U is used during the FLAG=3
%               call. Setting this to 0 is akin to making a promise that
%               U will not be used during FLAG=3. If you break the promise
%               then unpredictable results will occur.
%      SYS(7) = Number of sample times. This is the number of rows in TS.
%
%
%      X0   = Initial state conditions or [] if no states.
%
%      STR    = State ordering strings which is generally specified as [].
%
%      TS   = An m-by-2 matrix containing the sample time
%               (period, offset) information. Where m = number of sample
%               times. The ordering of the sample times must be:
%
%               TS = [0      0,      : Continuous sample time.
%                     0      1,      : Continuous, but fixed in minor step
%                                    sample time.
%                     PERIOD OFFSET, : Discrete sample time where
%                                    PERIOD > 0 & OFFSET < PERIOD.
%                     -2   0];   : Variable step discrete sample time
%                                    where FLAG=4 is used to get time of
%                                    next hit.
%
%               There can be more than one sample time providing
%               they are ordered such that they are monotonically
%               increasing. Only the needed sample times should be
%               specified in TS. When specifying than one
%               sample time, you must check for sample hits explicitly by
%               seeing if
%                  abs(round((T-OFFSET)/PERIOD) - (T-OFFSET)/PERIOD)
%               is within a specified tolerance, generally 1e-8. This
%               tolerance is dependent upon your model's sampling times
%               and simulation time.
%
%               You can also specify that the sample time of the S-function
%               is inherited from the driving block. For functions which
%               change during minor steps, this is done by
%               specifying SYS(7) = 1 and TS = [-1 0]. For functions which
%               are held during minor steps, this is done by specifying
%               SYS(7) = 1 and TS = [-1 1].
%   Copyright 1990-2002 The MathWorks, Inc.
%   $Revision: 1.18 $
%
% The following outlines the general structure of an S-function.
%

switch flag,
%%%%%%%%%%%%%%%%%%
% Initialization %
%%%%%%%%%%%%%%%%%%
case 0,
    = mdlInitializeSizes;
%%%%%%%%%%%%%%%
% Derivatives %
%%%%%%%%%%%%%%%
%case 1,
    %sys=mdlDerivatives(t,x,u);
%%%%%%%%%%
% Update %
%%%%%%%%%%
%case 2,
%sys=mdlUpdate(t,x,u);
%%%%%%%%%%%
% Outputs %
%%%%%%%%%%%
case 3,
    sys=mdlOutputs(t,x,u);
%%%%%%%%%%%%%%%%%%%%%%%
% GetTimeOfNextVarHit %
%%%%%%%%%%%%%%%%%%%%%%%
%case 4,
%sys=mdlGetTimeOfNextVarHit(t,x,u);
%%%%%%%%%%%%%
% Terminate %
%%%%%%%%%%%%%
case {1,2,4,9},% different
    sys=[];
%%%%%%%%%%%%%%%%%%%%
% Unexpected flags %
%%%%%%%%%%%%%%%%%%%%
otherwise
    error(['Unhandled flag = ',num2str(flag)]);
end
% end sfuntmpl
%
%=============================================================================
% mdlInitializeSizes
% Return the sizes, initial conditions, and sample times for the S-function.
%=============================================================================
%
function =mdlInitializeSizes
%
% call simsizes for a sizes structure, fill it in and convert it to a
% sizes array.
%
% Note that in this example, the values are hard coded.This is not a
% recommended practice as the characteristics of the block are typically
% defined by the S-function parameters.
%
sizes = simsizes;
sizes.NumContStates= 0;
sizes.NumDiscStates= 0;
sizes.NumOutputs   = 3;
sizes.NumInputs      = 6;
sizes.DirFeedthrough = 0;
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= ;
% end mdlInitializeSizes
%
%=============================================================================
% mdlDerivatives
% Return the derivatives for the continuous states.
%=============================================================================
%

%function sys=mdlDerivatives(t,x,u)
%sys = [];
% end mdlDerivatives
%
%=============================================================================
% mdlUpdate
% Handle discrete state updates, sample time hits, and major time step
% requirements.
%=============================================================================
%
%function sys=mdlUpdate(t,x,u)
%sys = [];
% end mdlUpdate
%
%=============================================================================
% mdlOutputs
% Return the block outputs.
%=============================================================================
%
function sys=mdlOutputs(t,x,u)
n=u(1);
tt=u(2);
t0=u(3);
t1=u(4);
t2=u(5);
t7=u(6);   
if n==1
   if t>=tt && t<tt+t0/2
   sys=;
   elseif t>=tt+t0/2 && t<tt+t0/2+t1/2
   sys=;
   elseif t>=tt+t0/2+t1/2 && t<tt+t0/2+t1/2+t2/2
   sys=;
   elseif t>=tt+t0/2+t1/2+t2/2 && t<tt+t0/2+t1/2+t2/2+t7
   sys=;
   elseif t>=tt+t0/2+t1/2+t2/2+t7 && t<tt+t0/2+t1/2+t2+t7
   sys=;
   elseif t>=tt+t0/2+t1/2+t2+t7 && t<tt+t0/2+t1+t2+t7
   sys=;
   else
   sys=;
   end
end

if n==2
if t>=tt && t<tt+t7/2
sys=;
elseif t>=tt+t7/2 && t<tt+t7/2+t1/2
sys=;
elseif t>=tt+t7/2+t1/2 && t<tt+t7/2+t1/2+t2/2
sys=;
elseif t>=tt+t7/2+t1/2+t2/2 && t<tt+t7/2+t1/2+t2/2+t0
sys=;
elseif t>=tt+t7/2+t1/2+t2/2+t0 && t<tt+t7/2+t1/2+t2+t0
sys=;
elseif t>=tt+t7/2+t1/2+t2+t0 && t<tt+t7/2+t1+t2+t0
sys=;
else
sys=;
end
end
if n==3
if t>=tt && t<tt+t0/2
sys=;
elseif t>=tt+t0/2 && t<tt+t0/2+t1/2
sys=;
elseif t>=tt+t0/2+t1/2 && t<tt+t0/2+t1/2+t2/2
sys=;
elseif t>=tt+t0/2+t1/2+t2/2 && t<tt+t0/2+t1/2+t2/2+t7
sys=;
elseif t>=tt+t0/2+t1/2+t2/2+t7 && t<tt+t0/2+t1/2+t2+t7
sys=;
elseif t>=tt+t0/2+t1/2+t2+t7 && t<tt+t0/2+t1+t2+t7
sys=;
else
sys=;
end
end
if n==4
if t>=tt && t<tt+t7/2
sys=;
elseif t>=tt+t7/2 && t<tt+t7/2+t1/2
sys=;
elseif t>=tt+t7/2+t1/2 && t<tt+t7/2+t1/2+t2/2
sys=;
elseif t>=tt+t7/2+t1/2+t2/2 && t<tt+t7/2+t1/2+t2/2+t0
sys=;
elseif t>=tt+t7/2+t1/2+t2/2+t0 && t<tt+t7/2+t1/2+t2+t0
sys=;
elseif t>=tt+t7/2+t1/2+t2+t0 && t<tt+t7/2+t1+t2+t0
sys=;
else
sys=;
end
end
if n==5
if t>=tt && t<tt+t0/2
sys=;
elseif t>=tt+t0/2 && t<tt+t0/2+t1/2
sys=;
elseif t>=tt+t0/2+t1/2 && t<tt+t0/2+t1/2+t2/2
sys=;
elseif t>=tt+t0/2+t1/2+t2/2 && t<tt+t0/2+t1/2+t2/2+t7
sys=;
elseif t>=tt+t0/2+t1/2+t2/2+t7 && t<tt+t0/2+t1/2+t2+t7
sys=;
elseif t>=tt+t0/2+t1/2+t2+t7 && t<tt+t0/2+t1+t2+t7
sys=;
else
sys=;
end
end

if n==6
if t>=tt && t<tt+t7/2
sys=;
elseif t>=tt+t7/2 && t<tt+t7/2+t1/2
sys=;
elseif t>=tt+t7/2+t1/2 && t<tt+t7/2+t1/2+t2/2
sys=;
elseif t>=tt+t7/2+t1/2+t2/2 && t<tt+t7/2+t1/2+t2/2+t0
sys=;
elseif t>=tt+t7/2+t1/2+t2/2+t0 && t<tt+t7/2+t1/2+t2+t0
sys=;
elseif t>=tt+t7/2+t1/2+t2+t0 && t<tt+t7/2+t1+t2+t0
sys=;
else
sys=;
end
end


% end mdlOutputs
%
%=============================================================================
% mdlGetTimeOfNextVarHit
% Return the time of the next hit for this block.Note that the result is
% absolute time.Note that this function is only used when you specify a
% variable discrete-time sample time [-2 0] in the sample time array in
% mdlInitializeSizes.
%=============================================================================
%
% end mdlGetTimeOfNextVarHit
%
%=============================================================================
% mdlTerminate
% Perform any end of simulation tasks.
%=============================================================================
%
%function sys=mdlTerminate(t,x,u)
%sys = []; % end mdlTerminate
% end mdlTerminate

witty01 发表于 2007-8-24 16:23

因为没有运行环境,没有flag的值,所以我只能调到这个程度了,你试试看吧,我也刚刚开始用matlab编程

另外,elseif是连写的不能分开
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