The variable is not being assigned a value for some reason. (MATLAB)

[poster]

For some reason, result_spmd is not being assigned a value and I am not sure what I have done wrong. Can someone please help me?

spmd(4)

    interval_size = (finish-start) / No_intervals;

    range = finish - start;

    start_spmd = ((labindex - 1) * (range/4)) + start;

    finish_spmd = start_spmd + (range/4);

    fprintf ("Worker %d will count from %f to %f ", labindex, start_spmd, finish_spmd );





for x = start_spmd:interval_size:(finish_spmd - interval_size)   

    result_spmd = result_spmd + 0.5 * ( Function_to_Integrate(x) + Function_to_Integrate(x+interval_size) ) * interval_size; %Issue is on this line

end



end



fprintf ("The value from worker 1 is %f\n", result_spmd{1} );

fprintf ("The value from worker 2 is %f\n", result_spmd{2} );

fprintf ("The value from worker 3 is %f\n", result_spmd{3} );

fprintf ("The value from worker 4 is %f\n", result_spmd{4} );

result_total = ( result_spmd{1} + result_spmd{2} + result_spmd{3} + result_spmd{4} );

% Display the answer

fprintf("The integral of x^2 is %f arbituary units\n\n",result_total);

toc



% This is the funtion you will be integrating  (y=x^2)

function y = Function_to_Integrate(x)

    y = x*x;

end

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