# No ldiv!(x, A, b) on Bidiagonal matrices

**URL:** <https://discourse.julialang.org/t/no-ldiv-x-a-b-on-bidiagonal-matrices/24704>\
**Category:** General Usage\
**Created:** [May 28, 2019, 6:59pm UTC](https://discourse.julialang.org/t/no-ldiv-x-a-b-on-bidiagonal-matrices/24704 "2019-05-28T18:59:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jonas-schulze](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jonas-schulze/32/9228_2.png) [@jonas-schulze](https://discourse.julialang.org/u/jonas-schulze)\
**Post date:** [May 28, 2019, 6:59pm UTC](https://discourse.julialang.org/t/no-ldiv-x-a-b-on-bidiagonal-matrices/24704/1 "2019-05-28T18:59:40Z")

</div>

Suppose

```julia
using LinearAlgebra

n = 10
A = Bidiagonal(rand(n,n), :L)
F = factorize(A)
b = rand(n)
x = similar(b)

```

Then `F === A` and `ldiv!(x, F, b)` throws a no-method-error while `ldiv!(F, b)` is fine. Is this intended?