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

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Shantanu K
Shantanu K 2013-3-24
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?

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回答（1 个）

Walter Roberson
Walter Roberson 2013-3-24
If there are no remaining symbolic variables in p, then double(p) to get the double precision equivalent.
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Shantanu K
Shantanu K 2013-3-24
Thanks Walter for your response. Then what i should do? when i use for loop then it create problem in calculation of p

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