Ok, thanks. However, in my actual problem i have to use an inner
constructor, something like
type MyType{T}
data::Array{Float64, 1}
meta::Dict{ASCIIString, T}
N::Int64
function MyType{T}(data::Array{Float64, 1}, meta::Dict{ASCIIString, T})
new(data, meta, length(data))
end
end
This results in the same kind of "no method" error, like:
MyType(zeros(Float64, 5), ["param"=>2.0])
Why this? Any solution?
Thanks,
Davide
On Monday, May 19, 2014 11:55:24 PM UTC+1, Ethan Anderes wrote:
>
> Your right….
>
> ["param" => 2.0] is of type Dict{ASCIIString,Float64} which is not a
> subtype of Dict{ASCIIString,Number}
>
> You can use parametric types to solve your problem as follows:
>
> type MyType{T}
> data::Array{Float64, 1}
> meta::Dict{ASCIIString, T}
> N::Int64
> end
> MyType{T}(data::Array{Float64, 1}, meta::Dict{ASCIIString, T}) = MyType(data,
> meta, length(data))
>
> Notice, that you also had an error when passing size(data) to MyType
> since size(data) returns a tuple rather than an Int64. I changed it to
> length(data) in the above example.
> On Monday, May 19, 2014 2:53:38 PM UTC-7, Davide Lasagna wrote:
>
> Hi,
>>
>> I am starting with julia and stumbled upon this issue. Say I want to
>> define this composite type
>>
>> type MyType
>> data::Array{Float64, 1}
>> meta::Dict{ASCIIString, Number}
>> N::Int64
>> end
>> where the data field will store some floats, meta will be a dict of
>> metadata (from a simulation), and N is some other number storing the size
>> of data (just a silly example).
>>
>> Say I define another constructor as:
>> MyType(data::Array{Float64, 1}, meta::Dict{ASCIIString, Number}) = MyType
>> (data, meta, size(data))
>>
>>
>> If I then create an instance with the default constructor I get the
>> expected behaviour:
>> MyType(zeros(Float64, 5), ["param"=>2], 5)
>>
>> "MyType([0.0,0.0,0.0,0.0,0.0],["param"=>2], 5)"
>>
>>
>> However, if I use the additional constructor I obtain a
>> MyType(zeros(Float64, 5), ["param"=>2.0])
>>
>> "no method MyType(Array{Float64,1}, Dict{ASCIIString,Float64})
>> while loading In[4], in expression starting on line 1"
>>
>>
>>
>> As far as I understand, by reading the documentation regarding parametric
>> composite types, the error is raised because Dict{ASCIIString, Float64}
>> is not a subtype of Dict{ASCIIString, Number}.
>>
>> What is the approach to cope with this problem?
>>
>> Thanks,
>>
>> Davide
>>
>>
