Re: [eigen] Question about ColMajor vs. RowMajor

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 17.12.2011 01:27, Michael Dixon wrote:
> My colleagues and I were recently playing around with changing the
> default for matrices from ColMajor to RowMajor, and we found that
> doing so changed the behavior of the () operator.  Specifically, when
> accessing a two-dimensional matrix with a single index (e.g., mat(i)

I assume you compiled with -DNDEBUG or something similar?
IIRC operator() with single argument should only be used for 
single-dimensional matrices (i.e. vectors).

Actually (question to Gael/Benoit): Shouldn't there be a compile-time 
check/static assertion for operator(), making it work only on matrices 
which are known at compile-time to have (at least) one dimension fixed to 1?

Or is operator()(int) supposed to mime the MATLAB behavior of mat(i) now 
(i.e. viewing the matrix data as a vector)?

Christoph



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Dipl.-Inf. Christoph Hertzberg
Cartesium 0.051
Universität Bremen
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