My loop returns imaginary results!

Maryam S

2020 5 30

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Hello,

I write this simple code in a loop, and I obtain unwabted imaginary results. Could you please tell me where my mistake is:

SO = 0.5 .* ones(10,1);
   A(1,:) = 5.02 * (16.6 / 42) ^ 0.33 * SO(1,:) ^ 0.38;
for i = 2 : 10
   A(i,:) = 5.02 * ((16.6 - sum(A(1:i-1,:)))/ 42) ^ 0.33 * SO(i,:) ^ 0.38;
end

Thanks in advance

Maryam S.

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madhan ravi 2020-5-30

编辑：madhan ravi 2020-5-30

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Evaluate the part

((16.6 - sum(A(1:i-1,:)))/ 42)

and see what happens when the sum(...) is greater than 16.6

Note: No loop needed here sum(...) could be replaced by cumsum(...) and linear indexing is sufficient, subscript indexing is not needed here since it’s a vector.