Jiaqi_Wang

QR failed for InterlaceOperator in segment of multi-union domain.

1

A is a multi-union interlaceOperator: such like that ~~InterlaceOperator : [Chebyshev(the segment [-2.5 - 0.5im,-1.5 - 0.5im])]⨄[Chebyshev(the segment [-1.5 + 0.5im,-0.5 + 0.5im])]⨄[Chebyshev(the segment [-0.5 - 0.5im,0.5 - 0.5im])]⨄[Chebyshev(the segment...

LoadError: UndefVarError: Domain1d not defined

8

Hello sir! I'm getting the following error message for Version 0.7,1.1 of julia of ApproxFun package, when precompiling it: **julia> using ApproxFun** [ Info: Precompiling ApproxFun [28f2ccd6-bb30-5033-b560-165f7b14dc2f] WARNING: could not...

How can I deal with the derivatives bessel with Respect to Order?

4

Sir, Thankyou for your good job. I want to ask how can I deal with the derivatives bessel with Respect to Order? Is this package can help me or not.

∂u∂n=⨍[G]\uiΓ not work for union domains? Because of "\" no suitable methods?

1

【@time φ0,∂u∂n=vec([0 ⨍;1 ⨍[G]]\Any[0.,uiΓ])】 works both for single and union domain in the Faraday’s cage example. However, error occurs with similar code【@time ∂u∂n=⨍[G]\uiΓ】using in example of Helmholtz equation: It is...

There are no Array{Segment{Complex{Float64}},1} method for "Space" function

2

Hello,sir. When I run the example of Lapalace.jl: cr = exp.(im*2π*(0:N-1)/N) crl = (1-2im*r)cr crr = (1+2im*r)cr dom = ∪(Segment.(crl,crr)) sp = Space(dom) MethodError: no method matching Space(::Array{Segment{Complex{Float64}},1}) Closest candidates...

A question for inverting the Hilbert transform

5

Hello sir, Your class is worth learning in detail. Thank you for your kindness!! In lecture 19, when you derive the solution of logarithmic singular integral equations, in the end,...

Tiny mistakes in Lecture 24

1



"S₀ = I : Chebyshev() → Ultraspherical(1)" :UndefVarError: I not defined

4

In lecture16, here are several codes: S₀ = I : Chebyshev() → Ultraspherical(1) f = Fun(exp, Chebyshev()) g = S₀*f g(4) - exp(4) I found the error when I run...

In lecture 14., and ..somewhere else.