985 reputation
48
bio website maths.leeds.ac.uk/~jitse
location Leeds, United Kingdom
age 39
visits member for 4 years
seen Jul 25 at 7:12

I am a lecturer in the School of Mathematics at the University of Leeds. My research specialization is numerical analysis (mostly ordinary differential equations, some partial differential equations, some linear algebra). Most of my programming is related to this; in particular I contribute to the Eigen library (linear algebra, C++). I usually program in Python, C++ or MATLAB. I have been using LaTeX from \pm 1994.


Aug
22
answered what is name of this numerical scheme for ode?
Aug
13
awarded  Critic
Aug
11
awarded  Civic Duty
Aug
9
comment Why is the only $k$ step method with stiff decay BDF?
I added some details on the first step.
Aug
9
revised Why is the only $k$ step method with stiff decay BDF?
elaborate on first step
Aug
8
answered Why is the only $k$ step method with stiff decay BDF?
Aug
6
answered Why is (asymptotic) stability inherited by A-stable Runge-Kutta-methods?
Aug
6
comment Why is (asymptotic) stability inherited by A-stable Runge-Kutta-methods?
I get it, you are worried about poles in $R$.
Aug
6
comment Why is (asymptotic) stability inherited by A-stable Runge-Kutta-methods?
Why does $x_{k+1} = R(\lambda\tau) x_k$ only hold for small enough step size?
Aug
5
comment Symplectic integrators and divergence free vector fields
I added a bit on second-order equations. You need the acceleration field to come from a conservative force; for instance, you can have acceleration pointing to the origin (a central force).
Aug
5
revised Symplectic integrators and divergence free vector fields
added bit on second-order equations
Aug
4
answered Symplectic integrators and divergence free vector fields
Jul
31
awarded  Organizer
Jul
31
revised What numerical optimization method to use for this function?
remove convex-optimization tag, as function is clearly not convex
Jul
31
suggested suggested edit on What numerical optimization method to use for this function?
Jul
30
awarded  Yearling
May
14
answered How to verify the order of DOPRI Runge-Kutta method
May
10
comment butcher tableau runge kutta methods
@user54511 that's correct
May
1
comment butcher tableau runge kutta methods
Yes, $c=1-\theta$. To get the other entries, write down the Runge-Kutta method corresponding to a Butcher tableau with one stage and $c=1-\theta$ and compare with the method you are considering.
May
1
comment Error estimate, asymptotic error and the Peano kernel error formula
ok, I edited my answer to give some details on what you need to do.