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Summation issue using loop

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Ali aaa
Ali aaa 2019-10-18
关闭： MATLAB Answer Bot 2021-8-20
I am trying to implement this summation in matlab but i do not know how ?
thank u

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回答（2 个）

Ali aaa
Ali aaa 2019-10-18
since n is just a number -1
for n=0:n-1
x(n+1) = ((x^2)(mN+i)
end
Robert U
Robert U 2019-10-20
Hi Ali aaa,
in your code parts are missing. Without knowing any constraints about the variables, I suggest the following solution:
  1. Define a (local) function to solve the summation formula
  2. check input validity
  3. Try to vectorize the calculation
function [Em] = sum_mNi(x,m,N)
validateattributes(x,{'numeric'},{'vector','nonempty'});
validateattributes(m,{'numeric'},{'scalar','nonempty'});
validateattributes(N,{'numeric'},{'scalar','nonempty'});
Em = 1/N * sum(cell2mat(arrayfun(@(ind) x.^2 .* (m*N + ind),0:N-1,'UniformOutput',false)'),1);
end
The solution might be wrong, depending on the input value types.
Kind regards,
Robert

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