| Re: [eigen] Index type for PermutationMatrix and Transpositions |
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On 25.01.2011 10:29, Helmut Jarausch wrote:
> On 01/25/11 10:11:22, Gael Guennebaud wrote:
>> Since it is unbelievable
>> that one day someone will perform a LU or LDLT dec on a matrix
>> requiring 64bits integers for the indices (think about the size of
>> the
>> matrix!), I think it is safe to use int there too.
Just like 640k ought to be enough for everyone ;)
> I agree for dense matrices, but a tridiagonal matrix of size 2^32
> isn't out of range (IMHO). So the situation might be different for
> sparse matrices - even in the near future.
I agree on that. Why not make it default to MatrixType::Index and tell
users to use an appropriate IndexType in the first place? This could be
even smaller if the matrix never reaches sizes above 2^16 (2^15?).
Christoph
--
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Dipl.-Inf. Christoph Hertzberg
Cartesium 0.051
Universität Bremen
Enrique-Schmidt-Straße 5
28359 Bremen
Tel: (+49) 421-218-64252
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