Plotting curves requires 1 parameter

For the code below, I want to plot a x against H graph trying to find the minimal of H, so I wrote

ezplot(x,H)

And there is an error "Plotting curves requires 1 parameter." What is the correct code to solve this problem?

Here is the code:

O=[706;524;1072]

D=[1049,1142,766]

c=[7 12.4 19.9;12.4 7 19.1;19.9 19.1 7]

syms x

f=c.^-x

syms A1 A2 A3 B1 B2 B3

A=[A1;A2;A3]

B=[B1,B2,B3]

j=1:3;

A1=(sum(D(j).*f(1,j)))^-1;

A2=(sum(D(j).*f(2,j)))^-1;

A3=(sum(D(j).*f(3,j)))^-1;

i=1:3;

B1=(sum(A(i).*O(i).*f(i,1)))^-1;

B2=(sum(A(i).*O(i).*f(i,2)))^-1;

B3=(sum(A(i).*O(i).*f(i,3)))^-1;

for i=1:3

for j=1:3

    T(i,j)=A(i).*B(j).*O(i).*D(j).*f(i,j)

end

end

for i =1:3

   y(i)=sum(T(i,:))

end

for i =1:3

z(i)=sum(T(:,i))

end

for i =1:3

    F(i)=(sum((y(i)-O(i))^2))+(sum((z(i)-D(i))^2))

end

H=sum(F)