Sheehan Olver

This is picking up where #495 left off. Some simple examples of derivatives involving `fft` are now working. I wasn't able to get `dct` or `r2r` working, yet, as they...

It would be nice to be able to generate notebooks for problem sheets where the solutions can be omitted. I'm imagining something like this: ** Problem 5** finish the following...

Don't export ∞

8

InfiniteArrays.jl has `∞` as a special type, which conflicts with the exporting of `∞` from this package. I think the best solution is to not export `∞` from here, as...

LinearAlgebra.reflectorApply!

5

I'm giving a seminar in a few weeks using QR and just realised that `LinearAlgebra.reflectorApply!` has issues with if the matrix is not diagonally dominant. Here's a simple demonstration of...

Make BDF solvers custom-vector type friendly

1

The BDF stepper seems to only work with `Vector`, e.g., with a custom vector type one may run into problems here https://github.com/SciML/OrdinaryDiffEq.jl/blob/683e56a953154ce2370e015fa2ad59133a4789ed/src/perform_step/bdf_perform_step.jl#L739 as `D` is stored as a `Matrix`. To...

https://github.com/JuliaMath/Calculus.jl/blob/ffeaee8ab516c4dd598be246e2ec8745f1dd70ca/src/differentiate.jl#L172

Add documentation

1

I can never remember the order of the arguments, and `?ode45` is not particularly helpful.

Add hooklength

1

I have the following code that calculates the `hooklength` of a partition. I'll put in a PR when I get time: ```julia function hooklength(σ::Vector{Int}) ret = 1 m = length(σ)...

Use HierarchicalMatrices.jl for n-body problems

1

This continues a conversation that started here: https://github.com/JuliaDiffEq/MultiScaleArrays.jl/issues/25#issuecomment-371539346 HierarchicalMatrices.jl gives a convenient way to implement the fast multipole method, which exploits low rank structure to make matrix multiplication fast. This...