evaluating the value of the gradient at some point.

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Del
Del 2012-12-21
评论： Bishwesvar Pratap Singh 2018-3-27
I have
syms x1 x2
f=x1^2+4*x2^2-8*x1-16*x2
f =
x1^2 - 8*x1 + 4*x2^2 - 16*x2
grad_f=gradient(f)
grad_f =
2*x1 - 8
8*x2 - 16
Now, I would like to evaluate the value of the gradient of f at some point, let say (x1,x2)=(1,0).
What should I do?

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回答（1 个）

Walter Roberson
Walter Roberson 2012-12-21
subs(grad_f, {x1, x2}, {1, 0})
You will likely want to double() the result of the subs()

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