geting answer in variable format , i want in number format.

z = sym('2*x1 * x1 + x2*x2 + 3*x3*x3');
syms x1 x2 x3 ;

gradz = [diff(z,x1); diff(z,x2); diff(z,x3)]; 
x1(1)=2;
x2(1)=-2;
x3(1)=1;

%for k=2:5
p=subs(gradz, [x1 x2 x3], [x1(1) x2(1) x3(1)]);

I am getting answer in variable format,,,,,,i want in number format....so how i should get it?

Answer 1

[Walter Roberson]

If there are no remaining symbolic variables in p, then double(p) to get the double precision equivalent.

[Shantanu K]

Thanks Walter for your response. Then what i should do? when i use for loop then it create problem in calculation of p

[Walter Roberson]

? What should you do about what ?