when I saved the m-file below under the name trial.m
function fcns=trial(z)
x=z(1);
y=z(2);
fcns(1)=A.*x.^p1+2.*y.^2-5.*x+7.*y-40;
fcns(2)=3.*x.^2-y.^2+4.*x+B.*y.^p2-28;
end
and when I entered in the command window:
A=1
B=2
p1=2
p2=1
guess=[2 3]
and after that I entered in the command window:
result=fsolve(@trial,guess)
I received the following error message:
??? Undefined function or variable 'A'.
Error in ==> trial at 4
fcns(1)=A.*x.^p1+2.*y.^2-5.*x+7.*y-40;
Error in ==> fsolve at 254
fuser = feval(funfcn{3},x,varargin{:});
Caused by:
Failure in initial user-supplied objective function evaluation.
FSOLVE
cannot continue.
Please what is wrong in my m-file ? ( the same m-file is working when A,B,p1 and p2 are replaced by numbers in the m-file )
I am using m-files like this one because working with x and y for me is easier than working with other names of variables.
Also the m-file must have a name because I need it to use it when I am entering the f-solve command in the command window.
