Extract positive value from solve function

Question

Sashi Mendoza 2022-4-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1687354-extract-positive-value-from-solve-function

编辑： Sashi Mendoza 2022-4-21

eqs = [(A-a1)  == d, (A-a2)  == d2;
 S = solve(eqs, [A B]);
 a = S.A
 b = S.B

In the code above, all other variables are given so i AM solving for A and B. The code above alrEADY works and displays a solution but how will I extract the positive values of the solution only , and assign them to variables a and b?

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Answer 1

Torsten 2022-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/1687354-extract-positive-value-from-solve-function#answer_933379

编辑：Torsten 2022-4-3

在 MATLAB Online 中打开

If a and b contain no more symbolic constants, then you can use

a = double(a);
b = double(b);
a = a(abs(imag(a)) < 1e-6);
b = b(abs(imag(b)) < 1e-6);
a = real(a);
b = real(b);
A = [];
B = [];
iter = 0;
for i = 1:numel(a)
  if a(i) >= 0 && b(i) >= 0
    iter = iter + 1;
    A(iter) = a(i);
    B(iter) = b(i);
  end
end
A
B