| Re: [eigen] array slicing/range |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] array slicing/range
- From: Aron Ahmadia <aja2111@xxxxxxxxxxxx>
- Date: Fri, 5 Feb 2010 14:00:55 +0300
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Hi Jinglei,
> I'm wondering if it's possible to use array(i:j)
Nope. The : isn't a reserved operator in C++, so for you to use an
expression like array(i:j), the best thing you could do would be to
write your own preprocessor that automagically takes expressions of
that form and translates them to array.segment(i,j)
David Bindel (Cornell) has a piece of software that does similar (but
not what you want) preprocessing work for constant matrices:
http://www.cs.cornell.edu/~bindel/cims/matexpr/
However, my recommendation is that you just stick with the Eigen API
unless you want to spend three days learning a parsing tool like YACC
to do what you want.
Warm Regards,
Aron Ahmadia
On Fri, Feb 5, 2010 at 1:53 PM, Jinglei Hu <jingleihu@xxxxxxxxx> wrote:
> Hi guys,
>
> I knew from the Eigen developer that one can use array.segment(i, j) to get
> slice of an array. I'm wondering if it's possible to use array(i:j) to get
> slice just like Fortran.
>
> Cheers,
> Jinglei
>
>
>