Thanks for the clarification.
If my function foo has more parameters I just go like this ?
function foo{V<:VecOrMat}(X::Vector{V}, param1::Int, param2::String)
...
end
Regards,
Jan
Dňa utorok, 28. apríla 2015 16:31:37 UTC+2 Tom Breloff napísal(-a):
>
> The reason is a little subtle, but it's because you have an abstract type
> inside a parametric type, which confuses Julia. When you annotate
> a::MyAbstractType, julia understands what to do with it (i.e. compiles
> functions for each concrete subtype). When you annotate
> a::Vector{MyAbstractType}, it is expecting a concrete type
> Vector{MyAbstractType}, but you are in fact passing it a different concrete
> type Vector{MyConcreteType}. Use the signature that Tim suggested to get
> around the issue.
>
> On Tuesday, April 28, 2015 at 10:08:57 AM UTC-4, Ján Dolinský wrote:
>>
>> Hi Tim,
>>
>> Thanks for the tip. Very interesting. In function definition it works. I
>> read the parametric-composite-types manual. I am still puzzled however.
>>
>> Consider the example below which works as I expect:
>>
>> a = rand(10)
>> b = rand(10,2)
>>
>> julia> a :: VecOrMat{Float64}
>> 10-element Array{Float64,1}:
>> ...
>>
>> julia> b :: VecOrMat{Float64}
>> 10x2 Array{Float64,2}:
>> ...
>>
>>
>> The following example does not work as I would expect:
>>
>> a = Vector{Float64}[rand(10), rand(10)]
>> b = Matrix{Float64}[rand(10,2), rand(10,2)]
>>
>> julia> a :: Vector{VecOrMat{Float64}}
>> ERROR: type: typeassert: expected
>> Array{Union(Array{Float64,1},Array{Float64,2}),1}, got
>> Array{Array{Float64,1},1}
>>
>> julia> b :: Vector{VecOrMat{Float64}}
>> ERROR: type: typeassert: expected
>> Array{Union(Array{Float64,1},Array{Float64,2}),1}, got
>> Array{Array{Float64,2},1}
>>
>> however, this:
>> julia> a :: Vector{Vector{Float64}}
>> 2-element Array{Array{Float64,1},1}:
>> ...
>> and this works:
>> julia> b :: Vector{Matrix{Float64}}
>> 2-element Array{Array{Float64,2},1}:
>> ...
>>
>> Thanks,
>> Jan
>>
>>
>>
>> Dňa utorok, 28. apríla 2015 13:13:36 UTC+2 Tim Holy napísal(-a):
>>>
>>>
>>> http://docs.julialang.org/en/release-0.3/manual/types/#parametric-composite-types
>>>
>>>
>>> Use foo{V<:VecOrMat}(X::Vector{V})
>>>
>>> --Tim
>>>
>>> On Tuesday, April 28, 2015 02:40:41 AM Ján Dolinský wrote:
>>> > Hi guys,
>>> >
>>> > I am trying to write a function which accepts as an input either a
>>> vector
>>> > of vectors or a vector of matrices e.g.
>>> >
>>> > function foo(X::Vector{VecOrMat{Float64}})
>>> >
>>> > When running the function with a vector of matrices I get the
>>> following
>>> > error " 'foo' has no method matching foo(::Array{Array{Float64,2},1})"
>>> >
>>> > Am I missing something here ?
>>> >
>>> > Thanks,
>>> > Jan
>>>
>>>
