how to solve two equation with 2 variables

Question

Adham Ahmed 2023-2-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1913450-how-to-solve-two-equation-with-2-variables

编辑： Matt J 2023-2-16

采纳的回答： Matt J

how to solve these two equations :

sin(x2) +2x2 =0

sin(x1-1)+2(x1-1)=0

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Answer 1

Matt J 2023-2-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1913450-how-to-solve-two-equation-with-2-variables#answer_1172620

编辑：Matt J 2023-2-16

在 MATLAB Online 中打开

You could use fsolve or fminsearch

fun=@(x) [sin(x(2))+2*x(2); sin(x(1)-1)+2*(x(1)-1)];
[x,fval]=fsolve(fun,[0;0])
Equation solved.

fsolve completed because the vector of function values is near zero
as measured by the value of the function tolerance, and
the problem appears regular as measured by the gradient.
x = 2×1
     1
     0
fval = 2×1
     0
     0
[x,fval]=fminsearch(@(x) norm(fun(x)), [0,0])
x = 1×2
    1.0000   -0.0000
fval = 9.4426e-05