nimbleRcall implementation of base::eigen

[Tom LaBone]

I want to call the base::eigen function from nimble code using nimbleRcall. I am not sure how to do this, but I know that this will not work:

es <- nimbleRcall(list(x=double(2)),Rfun="eigen",returnType=list(values=double(1),vectors=double(2)))

Any suggestions on how to achieve success here?

 

[Perry de Valpine]

Hi Tom,

eigen() is a supported function in nimble programming, so you might be able to avoid use of nimbleRcall for this need.  Please see  Table 11.3 in the User Manual.

In general if you do need a nimbleRcall like this, there are a couple of considerations. It is common to need to write a wrapper function, i.e. a function you access via nimbleRcall that calls your actual function of interest with arguments and then return value rearranged as needed. For example, if you just need the eigenvectors, a wrapper function could pick those out and return them.  The bigger issue is the returnType declaration: nimble type declarations do not include an R list of type declarations as a nimble type.  I think you could use a nimbleList data structure for this purpose.  You would have to create a nimbleList type and then use that as the declared returnType.  But you would still need to write a wrapper, so that you could convert the list returned from base::eigen into a nimbleList object to return from your wrapper.  I hope that makes sense.

But again, here's hoping that nimble's native support for eigen gives you what you need.

-Perry

  

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