Oh, I guess it's just with most of the Base types you can do that (they
must have internal constructors for it). The convert issue comes up because
you have type checks on your fields, i.e. ::Type, otherwise you could just
make an internal constructor which calls new(nothing,nothing). No sweat,
you can just make an internal constructor:
D() = new(Array{Float64,2}(),string())
(or anything like that). Since your Type is not mutable, you can just
overwrite what you put in there.
On Friday, July 15, 2016 at 6:37:54 PM UTC-7, J Luis wrote:
>
> Thanks. Didn't know one could create empty types,, but is it a 0.5
> feature. Because on 0.4
>
> julia> Di=D()
> ERROR: MethodError: `convert` has no method matching convert(::Type{D})
> This may have arisen from a call to the constructor D(...),
> since type constructors fall back to convert methods.
>
>
>
> sábado, 16 de Julho de 2016 às 02:28:30 UTC+1, Chris Rackauckas escreveu:
>>
>> Well, you just made the type D, so you can make Array{D,n} or anything
>> else like that. The Base types are not special in Julia, anywhere you can
>> use a type, you can use your own.
>>
>> You can create an empty form of your type via dinstance = D(). You can
>> then add to it by setting dinstance.data = someMatrix; dinstance.header =
>> "hi!". In fact, you can make a whole array of empty D's by Darr = [D() for
>> i in 1:N] and then set the fields in a loop by Darr[i].data = someMatrix.
>> You might want to read the documentation on type for more details.
>>
>> If you need the fields to be mutable, you can make one of the fields in
>> the type be a dictionary and use that, or you can use a cell array (I think
>> these may be deprecated?)
>>
>>
>> On Friday, July 15, 2016 at 6:14:26 PM UTC-7, J Luis wrote:
>>>
>>> Hi,
>>>
>>> I need to mimic what in Matlab is called a struct matrix. e.g.
>>>
>>> >> D=struct('data',{rand(2,2);rand(2,2)},'text',{'aa';'bb'})
>>>
>>> D =
>>>
>>> 2x1 struct array with fields:
>>>
>>> data
>>> text
>>>
>>>
>>> in MEX I would use (and actually that's what I do in the C MEX code that
>>> I'm trying to port)
>>>
>>> mxCreateStructMatrix()
>>>
>>> For one single of this it's easy
>>>
>>> type D
>>> data::Array{Float64,2}
>>> header::ASCIIString
>>> end
>>>
>>> but how do I create an array of D's?
>>> And probably worst, I need to fill them with the data that comes from a
>>> ccall(). So not only I do not know to create the array as I have no idea
>>> either on how fill it since one cannot create empty types and fill them in
>>> loops.
>>>
>>> Thanks
>>>
>>
