Help me solve this non-linear equation.

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David Perez Ramos
David Perez Ramos 2015-2-23
编辑： Andrew Newell 2015-2-23
Hello, I am new to MATLAB and I am trying to solve this non-linear equation, but the command windows said there is no solution found. Is this the right answer? Please see the picture attached in this questions. this is my code:
function z=eqns(x)
z(1)=sin(x(1).*x(2))^2;
z(2)=cos(x(1).*x(2));
end
Command Window:
>> solution = fsolve(@eqns,[-pi pi])
No solution found.
fsolve stopped because the last step was ineffective. However, the vector of function values is not near zero, as measured by the default value of the function tolerance.
<stopping criteria details>
solution =
-3.1953 3.1953
Thanks

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采纳的回答

Andrew Newell
Andrew Newell 2015-2-23
Before using MATLAB, you should think about the math. Suppose that y = x(1)*x(2). You are trying to solve
sin(y) = 0
cos(y) = 0
(if sin(y)^2=0 then sin(y)=0). Does this have any solutions?
  2 个评论
David Perez Ramos
David Perez Ramos 2015-2-23
Thanks for your fast respond I was able to solve it thank to your answer.
Andrew Newell
Andrew Newell 2015-2-23
编辑：Andrew Newell 2015-2-23
I hope your answer was no solutions!

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