how to use fsolve in a parfor loop to reach a correct answer?

Hi.

I have problem with parfor loop and fsolve function. when I use fsolve in a for loop it take times a lot ( at last answer correctly ), BUT when I use parfor ( and sliced variable to gather output ) its answer is incorrect. how can I use parfor and get correct answer.

part of the code:

with for :

K0=zeros(1,1,size(X1,3));
for k1=1:size(X1,3)
    K0(1,1,k1)=fsolve(@(krho)det(FunChi(krho,Xrho,Xphi,N,X1,X_1,k1)),Bsw0,options);
end

with parfor :

K0=zeros(1,1,size(X1,3));
parfor k1=1:size(X1,3)
    K0(1,1,k1)=fsolve(@(krho)det(FunChi(krho,Xrho,Xphi,N,X1,X_1,k1)),Bsw0,options);
end

[S.A abtahi]

it's very unaccustomed to me when I use

options = optimoptions('fsolve','Display','off','UseParallel',true);

( with parpool from the begining) in simple for loop

K0=zeros(1,1,size(X1,3));
for k1=1:size(X1,3)
    K0(1,1,k1)=fsolve(@(krho)det(FunChi(krho,Xrho,Xphi,N,X1,X_1,k1)),Bsw0,options);
end

the answers become incorrect. What is happening?

Answer 1

[Raymond Norris]

It shouldn't matter, but what is UseParallel option set to? You're using parfor and then is fsolve also using parfor (which resolves to running the "inner" parfor as a for-loop in reverse, negating the need to set UseParallel).

If options has UseParallel set to true, set it to false and then run the parfor again.

[S.A abtahi]

hi

thanks but it doesn't help

I had changed my options but the answers are incorrect again.

I used the options below:

options = optimoptions('fsolve','Display','off','UseParallel',false);