Solving non linear equation system.

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.

Answer 1

[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.

[Alberto Bolzoni]

Could you please suggest me another function that can be used and accepts more than one variable? Because actually I have to solve also systems with 15 variables and this method may be somehow difficult to be implemented.

[Torsten]

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]

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.