Ι have a problem finding a minimum

I created a fuction by writting

function [y]=h(x) 
y=(x^8+P(x))^2

end

and I saved it as h.m then I wrote

[x,fval]=fminsearch(h,[2,3])

and it says its error FYI P(x) is a polynomial which i created in the main file

[dpb]

What's P? Undefined here...

[dpb]

And, may as well show us the whole session including the error, too...

[joanna zappa]

P=polyfit(X,Y.',7)

[Walter Roberson]

Duplicated by later http://uk.mathworks.com/matlabcentral/answers/262900-have-a-problem-finding-a-minimum which has an answer, so I am merging into that

Answer 1

[jgg]

It looks like the issue is that you have not passed P into your function. You probably want something like this instead:

 P=polyfit(X,Y.',7);
 func = @(x)h(x,P);
 [x,fval]=fminsearch(func,[2,3])

where you define in your h.m file

 function [y]=h(x,P) 
   p = polyval(P,x);
   y=(x^8+p)^2
 end

Answer 2

[Walter Roberson]

Answered in duplicate Question http://uk.mathworks.com/matlabcentral/answers/262900-have-a-problem-finding-a-minimum

It sure is easier when people do not ask duplicate questions...