computing the gradient $f(\vec{x}) = \vec{x}^T\vec{x}+c$
489
How to take the gradient of the quadratic form?
18670
What is the gradient of $x^T A\, x$ with respect to the matrix $A$?
9924
Derivative of conjugate multivariate function
38923
What can we say about differentiability of $f$ at $c$?
141286
When is $\mathbf{X}^{T}\mathbf{X}+\lambda\mathbf{I}$ invertible?
76297
What is the inverse of the $\mbox{vec}$ operator?
35337
Problem in notation: $(\vec{v}\cdot\vec{\nabla})\vec{v}$ versus $L_v(\vec{v})$
28096
Finding the derivative of $x\uparrow\uparrow n$
85085
Simplifying the derivative of $|x|$
30032
What does it mean to take the gradient of a vector field?
140024
How to obtain the gradient in polar coordinates
32281
Derivative of convolution
103308
Showing that $\nabla\times(\nabla\times\vec{A}) = \nabla(\nabla\cdot\vec{A})-\Delta\vec{A}$
15287
Proving that second derivative is perpendicular to curve
16463
Is the function $\mbox{tr}(XAX')$ convex?
26602
Continuity and existence of directional derivatives at all directions of a $f:\mathbb{R}^{2} \to \mathbb{R}$ given by $f(x,y)=\frac{2x^2y}{x^2+y^2}$
66181
Find the derivative of the function