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Solving non linear equation system.

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Alberto Bolzoni
Alberto Bolzoni 2015-4-9
关闭： MATLAB Answer Bot 2021-8-20
I'm trying to solve this system:
sin(x)+y-2=0
x-y+1=0
with this procedure:
M=@(x,y)[sin(x)+y-2;x-y+1];
x0=[1,0];
Sol=fsolve(M,x0);
but I obtain an error. Could you please help me? Thank you.

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回答（1 个）

Michael Haderlein
fsolve needs a function which has only one variable. Therefore, you need to change your definition to
M=@(x)[sin(x(1))+x(2)-2;x(1)-x(2)+1];
The rest of your code is fine.
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Torsten
Torsten 2015-4-9
There is no such function in MATLAB because if you had a model with 150 unknowns, the alphabet wouldn't suffice to represent your variables.
Best wishes
Torsten.
Michael Haderlein
Michael Haderlein 2015-4-9
As Torsten said, there's no such function as far as I know. However, when I had the similar problem, I just typed in all the equations with the "natural" variable names in a blank file and then replaced the variable names by x(1), x(2) and so on (press ctrl+h). It's less likely to type in errors this way.

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