while using FMINCON can we pass matrices as arguments while using calling objective function saved as seperate file

I'm using FMINCON . I saved my objective function in a seperate file. can i pass matrices as arguments while calling the objective function from main program.? if yes can i access the individual elements of the matrix?

call from main program is given below

[x,fval]=fmincon(@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k),x0,A,b,Aeq,beq,lb,ub,@(x)nonlcon(x,i,SOC1,PVpow,Pabrmp,Pplc,Psm,V1ref,k));

here PVpow,Pabrmp,Psm,Pplc are matrices

Answer 1

[John D'Errico]

Yes. You can pass in any arguments you wish, matrices or not.

If you can pass them into a function, why would you think you cannot access individual elements of those matrices? Of course you can.

It seems apparent that you hd a problem, because otherwise, this question makes little sense. But if you got an error, then show it.

The function handle that you show:

@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k),

encapsulates the current value of those variables from the caller workspace, passing them into fun. fun can use those arguments in any way you wish.

[Krishna prasad K]

yeah, when i executed the code this error message was shown on command window (screen shot of error screen attached also)

Undefined function 'mtimes' for input arguments of type 'cell'.

Error in fun (line 2) f=EC(i+1)*(1/3)*{Pabrmp(i+1)+Psm(i+1)+Pplc(i+1)-PVpow(i+1)-x(k-i)-x(k-2*i+72)}+.055*(1/3)*x(k-2*i+72) + EC(i+2)*(1/3)*{Pabrmp(i+2)+Psm(i+2)+Pplc(i+2)-PVpow(i+2)-x(k-i+1)-x(k+1-2*i+72)}+.055*(1/3)

Error in @(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k)*

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

Error in predprog (line 46) [x,fval]=fmincon(@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k),x0,A,b,Aeq,beq,lb,ub,@(x)nonlcon(x,i,SOC1,PVpow,Pabrmp,Pplc,Psm,V1ref,k));

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

[John D'Errico]

Aw, give me a break! :) I can't read that pic without a microscope. :) :) I'm not old. Just age challenged.

The error message suggests what you did.

"Undefined function 'mtimes' for input arguments of type 'cell'."

So, one or more of those "arrays" is actually a cell array. I don't know which one, because there are a lot of multiplies in the line that had the error.

The point is though, you cannot multiply cell arrays. So lets try an example to show you what happens.

C = {1 2 3 4 5}
C =
  1×5 cell array
    [1]    [2]    [3]    [4]    [5]

C(1)*2
Undefined operator '*' for input arguments of type 'cell'.

The problem is, C(1) is still a cell array. I can extract that element though. So, this will work:

C{1}*2
ans =
     2

Why does this happen?

C(1)
ans =
  cell
    [1]

C{1}
ans =
     1

Because when you index a cell array with round parens, the result is another cell array. When you use curly braces, the result will be extracted from its cell array form.

You can also extract the elements of a cell array into a regular flat array using tools like cell2mat:

cell2mat(C)
ans =
     1     2     3     4     5

D = cell2mat(C)
D =
     1     2     3     4     5

D*pi
ans =
       3.1416       6.2832       9.4248       12.566       15.708

[Krishna prasad K]

thanks again for your time sorry for that screen shot :)

as per your instruction i used curl brackets to access the elements of the cell array. then the following error is shown

Cell contents reference from a non-cell array object.

Error in fun (line 2)

    f=EC{i+1}*{1/3}*{Pabrmp{i+1}+Psm{i+1}+Pplc{i+1}-PVpow{i+1}-x{k-i}-x{k-2*i+72}}+.055*(1/3)*x{k-2*i+72} +
    EC{i+2}*{1/3}*{Pabrmp{i+2}+Psm{i+2}+Pplc{i+2}-PVpow{i+2}-x{k-i+1}-x{k+1-2*i+72}}+.055*(1/3)

Error in

@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k)

Error in fmincon (line 601)

      initVals.f = feval(funfcn{3},X,varargin{:});

Error in predprog (line 50)

    [x,fval]=fmincon(@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k),x0,A,b,Aeq,beq,lb,ub,@(x)nonlcon(x,i,SOC1,PVpow,Pabrmp,Pplc,Psm,V1ref,k));

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

>>

Answer 2

[Krishna prasad K]

thanks again for your time sorry for that screen shot :)

as per your instruction i used curl brackets to access the elements of the cell array. then the following error is shown

Cell contents reference from a non-cell array object.

Error in fun (line 2)

    f=EC{i+1}*{1/3}*{Pabrmp{i+1}+Psm{i+1}+Pplc{i+1}-PVpow{i+1}-x{k-i}-x{k-2*i+72}}+.055*(1/3)*x{k-2*i+72} +
    EC{i+2}*{1/3}*{Pabrmp{i+2}+Psm{i+2}+Pplc{i+2}-PVpow{i+2}-x{k-i+1}-x{k+1-2*i+72}}+.055*(1/3)

Error in

@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k)

Error in fmincon (line 601)

      initVals.f = feval(funfcn{3},X,varargin{:});

Error in predprog (line 50)

    [x,fval]=fmincon(@(x)fun(x,i,EC,PVpow,Pabrmp,Pplc,Psm,V1ref,k),x0,A,b,Aeq,beq,lb,ub,@(x)nonlcon(x,i,SOC1,PVpow,Pabrmp,Pplc,Psm,V1ref,k));

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

>>