Warning: feval on script names will not work, or may work differently error.

x0=1 y0=1 z0=1

options=optimset('Display','iter');

[solution,fval] = fsolve(@myfun,[x0,y0,z0],options) % Call solver

eqn1 = @(x0, y0, z0) (-4.71777*10^21)+(2.10263*(10^15)*x0)-(3.49196*(10^8)*(x0^2))+(28*x0^3)+(1.56321*(10^14)*y0)-(3.76035*(10^7)*x0*y0)-(1.16399*(10^8)*y0^2)+(28*x0*y0^2)+(1.11156*(10^15)*z0)-(2.6739*(10^8)*x0*z0)-(1.16399*(10^8)*z0^2)+(28*x0*z0^2);

eqn2 = @(x0, y0, z0) (-7.62057*10^20)+(1.56321*(10^14)*x0)-(1.88017*(10^7)*x0^2)+(1.16012*(10^15)*y0)-(2.32797*(10^8)*x0*y0)+(28*(x0^2)*y0)-(5.64052*(10^7)*y0^2)+(28*y0^3)+(1.7955*(10^14)*z0)-(2.6739*(10^8)*y0*z0)-(1.88017*(10^7)*z0^2)+(28*y0*z0^2);

eqn3 = @(x0, y0, z0) (-5.41882*(10^21)+(1.11156*(10^15)*x0)-(1.33695*(10^8)*x0^2)+(1.7955*(10^14)*y0)-(1.33695*(10^8)*y0^2)+(2.41161*(10^15)*z0)-(2.32797*(10^8)*x0*z0)+(28*(x0^2)*z0)-(3.76035*(10^7)*y0*z0)+(28*(y0^2)*z0)-(4.01085*(10^8)*z0^2)+(28*z0^3));

fun = @(x) [eqn1(x(1), x(2), x(3)); eqn2(x(1), x(2), x(3)); eqn3(x(1), x(2), x(3))];

%it gives this error

Warning: Warning: feval on script names will not work, or may work differently,

 in a future version of MATLAB.  To make your code insensitive to any change

 and to suppress this warning message:

- Either change the script to a function.

- Or use eval instead of feval.

 The script file in question is myfun.

> In fsolve at 241

In positioning_by_ranging at 11

Error using feval

Attempt to execute SCRIPT myfun as a function:

C:\Matlab_codes\myfun.m

Error in fsolve (line 241)

            fuser = feval(funfcn{3},x,varargin{:});

Error in positioning_by_ranging (line 11)

[solution,fval] = fsolve(@myfun,[x0,y0,z0],options) % Call solver

Caused by:

    Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue.

Answer 1

[Walter Roberson]

What is in myfun.m ? You show us fun being constructed and it would normally be assumed you were going to fsolve fun but you fsolve the unknown myfun instead.