\ on qr factorization objects gives a method error

[ChrisRackauckas]

MWE:

A = cu(-rand(3,3)); b = cu(rand(3))
_qr = qr(A)
_qr \ A

QR factorization already works, and JuliaGPU/CuArrays.jl#165 handled the \ for Triangular, so all of the pieces are there to define this. In fact,

_x = vec(UpperTriangular(_qr.R) \ (_qr.Q' * reshape(b,length(b),1)))

works, since JuliaGPU/CuArrays.jl#165 requires a matrix, so it's not that far off. Using this a \ can be defined which would solve https://github.com/JuliaGPU/CuArrays.jl/issues/103

[ChrisRackauckas]

Ref: SciML/OrdinaryDiffEq.jl#719

[ChrisRackauckas]

JuliaGPU/CuArrays.jl#580

[maleadt]

This works now.