# Using ToeplitzMatrices
**URL:** https://discourse.julialang.org/t/using-toeplitzmatrices/53140
**Category:** General Usage
**Created:** [January 11, 2021, 4:04am UTC](https://discourse.julialang.org/t/using-toeplitzmatrices/53140 "2021-01-11T04:04:55Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@panditabupesh](https://discourse.julialang.org/u/panditabupesh)
#### Post date: [January 11, 2021, 4:04am UTC](https://discourse.julialang.org/t/using-toeplitzmatrices/53140/1 "2021-01-11T04:04:55Z")
```julia
using ToeplitzMatrices
Hankel([1.,2.,3.], 3:5)
Hankel([1,2,3], 3:5)
```
The first example work, but the second fails with this message:
ERROR: LoadError: TypeError: in new, expected Toeplitz{Int64,S} where S\<:Number, got a value of type Toeplitz{Float32,Complex{Float32}}
Stacktrace:
[1] \_Hankel at C:\Users\bupandit.julia\packages\ToeplitzMatrices\JiFWS\src\ToeplitzMatrices.jl:667 [inlined]
[2] Hankel{Int64}(::Array{Int64,1}, ::UnitRange{Int64}) at C:\Users\bupandit.julia\packages\ToeplitzMatrices\JiFWS\src\ToeplitzMatrices.jl:677
[3] Hankel(::Array{Int64,1}, ::UnitRange{Int64}) at C:\Users\bupandit.julia\packages\ToeplitzMatrices\JiFWS\src\ToeplitzMatrices.jl:680
[4] top-level scope at C:\Projects\PHYBUDGET\pam4\_j\hankel\_example.jl:4
[5] include(::String) at .\client.jl:457
[6] top-level scope at REPL[113]:1
in expression starting at C:\Projects\PHYBUDGET\pam4\_j\hankel\_example.jl:4
---
### Author:  [@Skoffer](https://discourse.julialang.org/u/Skoffer)
#### Post date: [January 11, 2021, 10:32am UTC](https://discourse.julialang.org/t/using-toeplitzmatrices/53140/2 "2021-01-11T10:32:27Z")
It looks like a bug in `ToeplitzMatrices.jl`, at least this conversion looks suspicious
```julia
julia> convert(Toeplitz{Int}, Toeplitz{Int}([3, 4, 5], [3, 2, 1]))
3×3 Toeplitz{Float32, ComplexF32}:
3.0 2.0 1.0
4.0 3.0 2.0
5.0 4.0 3.0
```
I think it makes sense to open an issue in ToeplitzMatrices.jl repository.
If you can allow yourself type piracy, you can override current behaviour with
```julia
import ToeplitzMatrices
ToeplitzMatrices.Toeplitz(vc::AbstractVector, vr::AbstractVector) = Toeplitz{promote_type(eltype(vc), eltype(vr))}(vc, vr)
```