I am using parfor and fminsearch. The error massege is "An UndefinedFunction error was thrown on the workers for 'x'....'

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YoungGon Ryu 2015-4-3

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评论： Joshua Wysack 2015-5-1

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Hello. I am in trouble with an error message as following:

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Analyzing and transferring files to the workers ...done. Error using EXTRACTION (line 834) An UndefinedFunction error was thrown on the workers for 'x'. This might be because the file containing 'x' is not accessible on the workers. Use addAttachedFiles(pool, files) to specify the required files to be attached. See the documentation for 'parallel.Pool/addAttachedFiles' for more details.

Caused by: Undefined function 'x' for input arguments of type 'double'.

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I am using 'parfor' and 'fminsearch' in my code. The code is shown in below.

parfor b=1:7953
      Ra=x(1);
      Rb=x(2);
      La=x(3);
      Lb=x(4);
      Ga=x(5);
      Gb=x(6);
      Ca=x(7);
      Cb=x(8);
      R=[Ra, Rb, Rb; Rb, Ra, Rb; Rb, Rb, Ra;];
      L=[La, Lb, Lb; Lb, La, Lb; Lb, Lb, La;];
      G=[Ga, Gb, Gb; Gb, Ga, Gb; Gb, Gb, Ga;];
      C=[Ca, Cb, Cb; Cb, Ca, Cb; Cb, Cb, Ca;];
      Z=R+1i*wm(b,1).*L;
      Y=G+1i*wm(b,1).*C;
      Gamma=sqrtm(Z*Y);
      Zc=Gamma/Y;
      RLGC=abs(real(Zc_A_11(b,1))-real(Zc(1,1)))+abs(imag(Zc_A_11(b,1))-imag(Zc(1,1)))+abs(real(Zc_A_12(b,1))-real(Zc(1,2)))+abs(imag(Zc_A_12(b,1))-imag(Zc(1,2)));
      x0=[R_open(b,1), R_open(b,1)*0.1, L_open(b,1), L_open(b,1)*0.1, G_open(b,1), G_open(b,1)*0.1, C_open(b,1), C_open(b,1)*0.1];
      x=fminsearch(RLGC, x0, optimset('MaxFunEvals', 1e10, 'MaxIter', 1e7, 'TolX', 1e-7));
      Ra_num(b,1)=x(1);
      Rb_num(b,1)=x(2);
      La_num(b,1)=x(3);
      Lb_num(b,1)=x(4);
      Ga_num(b,1)=x(5);
      Gb_num(b,1)=x(6);
      Ca_num(b,1)=x(7);
      Cb_num(b,1)=x(8);
end

where wm, Zc_A_11, Zc_A_12 are calculated values before the shown code. I have no idea what I am doing wrong. Someone help me please. Please give me an advise or fix my code. It will be very helpful for me. Thank you..

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Edric Ellis 2015-4-7

Where is x defined before the parfor loop starts?

Joshua Wysack 2015-5-1

I'm having a similar issue, I've found that if I alter the the code being run in parallel in any way and rerun it, it works correctly. I deleted a spacer line at one point and mine started running in parallel correctly. I'm not sure why this is, but it may provide more information to try and find a cause/solution.

My UndefinedFunction is a Java class by the way.

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