Unrecognized function or variable 'f2'.

When i run my program i get the errror.How can i fix it ?

[X, Y]=meshgrid(-5:0.1:5);
Z=sin(X.*Y)./X;
C=contourf(X,Y,Z); 
clabel(C)
grid on
figure
plot3(X,Y,Z);
hold on
grid on
xlabel('x');
ylabel('y');
title('Лінії рівня');
 
[res1,Fmin1]=fminsearch('f2',[0,1])
plot3(res1(1),res1(2),Fmin1,'ro-'); 
[res2,Fmin2]=fminsearch('f2',[0,-1])
plot3(res2(1),res2(2),Fmin2,'ro-');

figure
C=contourf(X,Y,Z); 
clabel(C)
grid on
hold on
plot(res1(1),res1(2),'ro-');
plot(res2(1),res2(2),'ro-');

Answer 1

[Walter Roberson]

When you use a quoted string as the first parameter to fminsearch then it needs to be the base name (without extension) of an executable file that is on your MATLAB path. It would typically name an m file such as f2.m but there are other possibilities