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

[Nicholas Tustison]

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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