# MATLAB: How to interpret the result from the matlabpool parallel processing

matlabpoolparallel computing

In order to understand the matlabpool parallel processing, I tried a simple example.
spmd %the statement from the Parallel computing toolbox    % Run all the statements in parallel    if labindex==1    a=2   end   if labindex==2     b=3     end    a+bend
The expected result is supposed to be 5, but in reality there is a error:
An UndefinedFunction error was thrown on the workers for 'a'. This may be because the file containing 'a' is not accessible on the workers. Specify the required files for this parallel pool using the command: addAttachedFiles(pool, …). See the documentation for parpool for more details. Undefined function or variable "a".
How to fix this problem

      spmd         if labindex==1          A=2;         end         if labindex==2          A=3;         end      end      result= A{1}+A{2}