AddResidualBlock and DynamicCostFunction::Evaluate

[Zhian Guo]

I have a question on the behavior of these two functions.   I have DynamicCostFunction implementation that operates on one block but it's identical to all blocks.   So use AddResidualBlock() to add one cost function object to for each block using the pointer to the specific parameter block I operate on.   But what I see in the Evaluate function is that I am presented with a double pointer that includes all blocks.       How do I get around this problem?    It's rather tedious to have a block index passed to each cost function object which is not a very elegant solution.

Thanks in advance.

[Sameer Agarwal]

If your construction operates on just one block why are you using a dynamicconstruction?

Sameer 

On Tue, Mar 11, 2025, 1:55 AM Zhian Guo <zhia...@gmail.com> wrote:

I have a question on the behavior of these two functions.   I have DynamicCostFunction implementation that operates on one block but it's identical to all blocks.   So use AddResidualBlock() to add one cost function object to for each block using the pointer to the specific parameter block I operate on.   But what I see in the Evaluate function is that I am presented with a double pointer that includes all blocks.       How do I get around this problem?    It's rather tedious to have a block index passed to each cost function object which is not a very elegant solution.

Thanks in advance.

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[Zhian Guo]

The parameter block size is not determined at compile time and I have to do analytical jacobian.  

What's the appropriate class I should choose in this case?

Thanks

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[Sameer Agarwal]

Just use a regular costfunction object 

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[Zhian Guo]

Ok thanks.

In the Evaluate interface of CostFunction class is it garanteed that parameter[0] is the pointer I used to call Problem::AddResidualBlock)?

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[Sameer Agarwal]

Yes

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