can't convert to Matrix

[kleinschmidt]

               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
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  | | |_| | | | (_| |  |  Version 0.6.2 (2017-12-13 18:08 UTC)
 _/ |\__'_|_|_|\__'_|  |
|__/                   |  x86_64-pc-linux-gnu

julia> using PDMats

julia> x = rand(2,2)
2×2 Array{Float64,2}:
 0.667854  0.660297
 0.92969   0.775099

julia> y = PDMat(x'x)
PDMats.PDMat{Float64,Array{Float64,2}}(2, [1.31035 1.16158; 1.16158 1.03677], Base.LinAlg.Cholesky{Float64,Array{Float64,2}} with factor:
[1.14471 1.01474; 0.0 0.0840556])

julia> Matrix(y)
ERROR: MethodError: Cannot `convert` an object of type PDMats.PDMat{Float64,Array{Float64,2}} to an object of type Array{T,2} where T
This may have arisen from a call to the constructor Array{T,2} where T(...),
since type constructors fall back to convert methods.
Stacktrace:
 [1] Array{T,2} where T(::PDMats.PDMat{Float64,Array{Float64,2}}) at ./sysimg.jl:77

[ararslan]

Yeah, it's because we dropped 0.6 support at the same time as changing full to Matrix to mimic Base. full should still work on 0.6 and should work with a depwarn on 0.7.

[devmotion]

This seems to be fixed in the latest (and probably previous) release:

julia> using PDMats

julia> x = rand(2,2)
2×2 Matrix{Float64}:
 0.252179  0.297023
 0.598621  0.824223

julia> y = PDMat(x'x)
2×2 PDMat{Float64, Matrix{Float64}}:
 0.421941  0.5683
 0.5683    0.767567

julia> Matrix(y)
2×2 Matrix{Float64}:
 0.421941  0.5683
 0.5683    0.767567