Diff does not work with symmatrix

6 次查看（过去 30 天）
GIOSUÉ
GIOSUÉ 2025-3-14
评论： GIOSUÉ 2025-3-14
Ran in:
Consider the following very simple example:
syms a x [1,1] matrix
diff(x .^ (symmatrix(eye(1)) - a), x)
ans = 
The output of the function shoud be simply:
(symmatrix(eye(1)) - a)*x.^-a
while instead is returned exactly the same command of the input.
Is it a bug? Do you know any turn around?
Thank you

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2025-3-14
编辑：Matt J 2025-3-14
Ran in:
Element-wise exponentiation is not a standard matrix algebra operation. I imagine it is for that reason that symmatrix.diff() doesn't support it. Workaround:
syms a x [3,3]
F_vec = reshape(x .^ (eye(3) - a), [], 1);
dF_vec = jacobian(F_vec, x(:));
dF = reshape(diag(dF_vec), 3, 3)
dF = 

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Code Performance 的更多信息

标签

产品


版本

R2024b

Community Treasure Hunt

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

Start Hunting!

Translated by