problem with the fminsearch function

gw = @(c,m) -((2.*m.*c)./(4 + 0.8.*m + c.^2 + 0.2.*m.^3));

[X,Y] = meshgrid(0:.5:10,0:.5:10);
Z = gw(X,Y);
surf(X,Y,Z,'EdgeColor','none')

[xy,z] = fminsearch(gw,[4,5])

and i get the error

Not enough input arguments.

Error in Homework_3>@(c,m)-((2.*m.*c)./(4+0.8.*m+c.^2+0.2.*m.^3))

Error in fminsearch (line 200)
fv(:,1) = funfcn(x,varargin{:});

Error in Homework_3 (line 79)
[xy,z] = fminsearch(gw,[4,5])

please help

Answer 1

[Matt J]

fminsearch assumes your objective function has a single input argument

[xy,z] = fminsearch(@(xy) gw(xy(1),xy(2)),[4,5])