problem in create script when use pmode

hi,

my computer has two cores, so I tried to run this simple code. I faced two problems:

1. I can not run script, I can run this code from command window. I don not know why?
2. when run it , the two cores give me two results. It must each core give one result. Where each core sum one column.why each core give the sum of two columns?

    pmode start 
    x=magic(2);
    a=sum(x,distributed());

thanks in advance

[Walter Roberson]

Related question from same poster: http://www.mathworks.co.uk/matlabcentral/answers/53675-problem-in-running-when-use-pmode