Seems like a bug to me. Can you file an issue?
On Thu, Oct 13, 2016 at 10:13 AM, Josh Day <[email protected]> wrote:
> After much confusion, I discovered That BLAS.syr! gives incorrect results
> when using a view. Is this a bug, or is it not recommended to use views
> with BLAS functions?
>
>
> julia> a1 = zeros(2,2); a2 = zeros(2, 2); x = randn(5, 2);
>
> julia> BLAS.syr!('U', 1.0, view(x, 1, :), a1)
> 2×2 Array{Float64,2}:
> 0.483364 0.440104
> 0.0 0.400716
>
> julia> BLAS.syr!('U', 1.0, x[1, :], a2)
> 2×2 Array{Float64,2}:
> 0.483364 0.458034
> 0.0 0.434032
>
> However, BLAS.syrk! appears to work:
>
> julia> a1 = zeros(2,2); a2 = zeros(2, 2); x = randn(5, 2);
>
> julia> BLAS.syrk!('U', 'T', 1.0, x, 0.0, a1)
> 2×2 Array{Float64,2}:
> 4.16346 -0.618009
> 0.0 4.75777
>
> julia> BLAS.syrk!('U', 'T', 1.0, view(x, :, :), 0.0, a2)
> 2×2 Array{Float64,2}:
> 4.16346 -0.618009
> 0.0 4.75777
>
