fmincon error, please help me!

fzstage2 = @(fkj, h2k, h2l) zstage2([fkj, h2k, h2l], demandrateSubregionBothDCs(1,j),...
      distances(DCindexk, j), distances(DCindexl, j), spatialpointdensity(j),...
      k, numberofstops(j), s2, ts, vmax2, cd, cr, dcs, ci, cif, cs);

  fzstage2con = @(fkj, h2k, h2l) zstage2con([fkj, h2k, h2l], demandrateSubregionBothDCs(1,j),...
      distances(DCindexk, j), distances(DCindexl, j), spatialpointdensity(j),...
      k, numberofstops(j), s2, ts, vmax2);
  
  

  decVar0=[0.5 1 1];

  lb=[0,0,0]; 

  ub=[1, 1000, 1000];

  options=optimset('largescale','off','display','iter'); 

  [decVaropt,fval,exitflag,output] = fmincon(fzstage2,decVar0,[],[],[],[],lb,ub,fzstage2con,options); 

Err Msg:
Error using
@(fkj,h2k,h2l)zstage2([fkj,h2k,h2l],demandrateSubregionBothDCs(1,j),distances(DCindexk,j),distances(DCindexl,j),spatialpointdensity(j),k,numberofstops(j),s2,ts,vmax2,cd,cr,dcs,ci,cif,cs)
Not enough input arguments.

Error in fmincon (line 601)
      initVals.f = feval(funfcn{3},X,varargin{:});

Caused by:
    Failure in initial user-supplied objective function evaluation.
    FMINCON cannot continue.

function  [ zstage2con ceq ] = zstage2con( DECVAR, DtotStage2j, rkj, rlj, SPDj, k, nsj, s2, ts, vmax2)

fkj = DECVAR(1);

h2k = DECVAR(2);

h2l = DECVAR(3);
...
function  zstage2 = zstage2( DECVAR, DtotStage2j, rkj, rlj, SPDj, k, nsj, s2, ts, vmax2, cd, cr, dcs, ci2, cif, cs)

fkj = DECVAR(1);

h2k = DECVAR(2);

h2l = DECVAR(3);
...

help! T_T

Answer 1

[Alan Weiss]

If I understand you, then this is a syntax error. fmincon expects that the objective function is a function of one variable. This variable can be a matrix or vector. So if you have variables fkj, h2k, and h21, you should write your objective function as

 function y = zstage(x)
 fkj = x(1:21); % assumes fkj is a 21-element vector
 h2k = x(22:40); % h2k is a 19-element vector
 h21 = x(41); % h21 is a scalar
 ...

Or, if you want to include some parameters in your objective function, do it as described here.

If I misunderstood what you were asking, feel free to ask again.

Alan Weiss

MATLAB mathematical toolbox documentation