[ADMB Users] explantion on error message: no match for 'operator'

John Sibert sibert at hawaii.edu
Fri May 27 09:46:20 PDT 2011

Vector and matrix operations are documented briefly in the API 
documentation found at


On 05/27/2011 06:11 AM, dave fournier wrote:
> Is this a vignette?
> When I was writing the Autodiff libraries (which underly ADMB)
> I used the * operator for the vector dot product.  Why not use
> the same conventions as R you ask.  Well R did not exist yet (this was 
> around 1990)
>  and Splus (if it existed) was so full of memory leaks that it was 
> incapable of
> running any slightly non-trivial (for that time) non linear
> parameter estimation model.   Even today  ADMB is up to thousands
> of times faster than R for slightly large nonlinear models.
> One thing I hate to do is to break code that currently works.
> (Sadly open sourcing seems to have degraded the software a bit in
> this respect, but what can you expect from a committee.)
> But I digress.
> Anyway  since * was taken I used elem_prod and elem_div for
> element wise operations.
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John Sibert
Emeritus Researcher, SOEST
University of Hawaii at Manoa

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