[Insight-developers] Best way to concatenate itk Arrays?

[Michael Stauffer (Circular Logic)]

Thanks Nick. This is what I've used so far, along with copy_out(). I was
checking to see if it's Kosher with itk best practices, since it's
relying on the underlying data type. 

Cheers,
Michael 

>-----Original Message-----
>From: Nicholas Tustison [mailto:ntustison at gmail.com] 
>Sent: Thursday, December 09, 2010 4:38 PM
>To: Michael Stauffer (Circular Logic)
>Cc: 'ITK-dev-list'
>Subject: Re: [Insight-developers] Best way to concatenate itk Arrays?
>
>Hi Michael,
>
>You should look in the BSplineDeformableTransform class where 
>the data_block() function is accessed directly.
>
>Nick
>
>
>On Dec 9, 2010, at 4:18 PM, Michael Stauffer (Circular Logic) wrote:
>
>> Hi,
>> 
>> I need to concatenate itk Arrays (Transform::ParameterType objects,
>> actually) into a single new Array. Is it acceptable to 
>directly use the
>> underlying public vnl_vector routines like data_block() and 
>copy_out()
>> to do this efficiently? Or must I copy element-by-element using
>> Array::GetElement(). Or is there some other way I'm missing?
>> 
>> I could add an Insert method to Array that allows inserting 
>of another
>> array at a given index, in order to avoid using the 
>vnl_vector routines
>> directly.
>> 
>> This is part of the new CompositeTransform class. We're set-ing and
>> get-ing concatenated parameter arrays that hold the 
>parameters for all
>> the constituent transforms in the composite class. We may 
>have dozens of
>> transforms at once, so element-by-element copying will start 
>to add up
>> over all the calls to get and set parameters made by the optimizer in
>> the registration process.
>> 
>> Cheers,
>> Michael
>> 
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