清空筛选条件
清空筛选条件

How to evaluate an algebraic expression at a certain point when it is in a matrix?

6 次查看（过去 30 天）
Aravind Vissamsetty
评论： Aravind Vissamsetty 2021-3-15
In the below expressions:
syms x1 x2 H f
xs = [1 1];
f = (12*x1^3 - 20*x1^3*x2^2 + 6*x2^2 + x1^2 +9);
H = hessian(f);
So the term H(1,1) would be a symbolic with a value (- 120*x1*x2^2 + 72*x1 + 2)
What is the simplest way to calculate the value of this expression at a point, say (x1,x2) = (1,2) ?

请先登录，再回答此问题。

采纳的回答

ANKUR KUMAR
ANKUR KUMAR 2021-3-15
You can use matlabFunction to create an anonymous function, which will eventually help to calcuate the values at specific x1 and x2.
syms x1 x2 H f
xs = [1 1];
f1 = (12*x1^3 - 20*x1^3*x2^2 + 6*x2^2 + x1^2 +9);
func=matlabFunction(hessian(f1));
func(1,2)

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Linear Algebra 的更多信息

标签

产品


版本

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by