Error: The variable voltages1 in a parfor cannot be classified.

1 visualización (últimos 30 días)
Hello,this is my code.
It is not runing because "The variable voltages1 in a parfor cannot be classified." Why?
voltages1 = num2cell(zeros(1,256),1);
voltages2 = voltages1;
parfor i=1:8
inputVoltage1 =readVoltage(a,'A0');
inputVoltage2 =readVoltage(a,'A5');
voltages1{256} = inputVoltage1;
voltages2{256} = inputVoltage2;
subplot(2,1,1) ;
[ax,h1,h2] = plotyy(times,voltages1{:},times,voltages2{:});
%axis(ax(1),[0 1 0 5]);
%axis(ax(2),[0 1 0 5]);
set(get(ax(1),'Ylabel'),'String','I Channel');
set(get(ax(2),'Ylabel'),'String','Q Channel');
title('Time Domain');
drawnow update;
voltages1{1:255} = voltages1{2:256};
voltages2{1:255} = voltages2{2:256};

Respuesta aceptada

Marc Jakobi
Marc Jakobi el 4 de Oct. de 2016
The problem is the line
voltages1{256} = inputVoltage1;
You cannot set a fixed index of an array or a matrix in a parfor loop, since multiple parallel instances of the loop will conflict with each other, trying to set voltages1{256} to different values at the same time.
  4 comentarios
0460051 NCTU
0460051 NCTU el 5 de Oct. de 2016
Editada: 0460051 NCTU el 5 de Oct. de 2016
Thanks,but I still feel confused. I did not use the variable i just for repeating 8 who runs in parallel? And I had another problems.
An UndefinedFunction error was thrown on the workers for 'configurePin'. This might be because the file containing 'configurePin' 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: Error using parallel_function>make_general_channel/channel_general (line 929) Undefined function 'configurePin' for input arguments of type 'double'.
I had no idea what it meant....
Marc Jakobi
Marc Jakobi el 5 de Oct. de 2016
I think you want to use for instead of parfor. parfor is used for parallel computing and doesn't make much sense when generating figures.

Iniciar sesión para comentar.

Más respuestas (1)

0460051 NCTU
0460051 NCTU el 6 de Oct. de 2016
Really? The reason why I use the function of parfor is beacause I want to make it plot quickly. Now ,I made time and fequency domains respectively,but the sampling rate was slower than the LabView's. So,that's why I wanted to seek the faster way to replace the LabView.
Thanks for your answering,thank you very much, Marc.


Más información sobre Loops and Conditional Statements en Help Center y File Exchange.


Aún no se han introducido etiquetas.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by