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6 Commits

Author SHA1 Message Date
Laura Messio
477f5f4ea1 bug in a det_manip constructor (from vectors for x and y values) corrected 2013-12-18 11:21:39 +01:00
Olivier Parcollet
b534936589 Fix matrix * alias issue and adapt det_manip
- The previous version of the * operator for matrix was too clever.
It was giving a lazy object and then rewriting C = A *B into gemm (a,A,B,0,C).
The pb was in case of aliasing : when e.g. C = A, or is a part of A.
gemm is not correct that case, and as a result generic code like
a = a *b
may not be correct in matrix case, which is unacceptable.

- So we revert to a simple * operator for matrix
that does immediate computation.
Same thing for matrix* vector

- we also suppress a_x_ty class.

-> for M = a * b,
when M is a matrix, there is no overhead due to move assignment
-> however, when M is a view, there is an additionnal copy.

-Correctness comes first, hence the fix.
However, if one wants more speed and one can guarantee that
there is no aliasing possible, then one has to write a direct gemm call.

-> det_manip class was adapted, since in that case, we can show there
no alias, and we want the speed gain, so the * ops where replaced
by direct blas call (using the array blas interface).

-> also gemm, gemv, ger were overloaded in the case the return
matrix/vector (i.e. last parameter of the function) is not an lvalue,
but a temporary view created on the fly.
2013-09-11 18:49:22 +02:00
Laura Messio
a39e41e9fd det_manip: try_insert_from_function(i,j,fx,fy,ksi) 2013-09-09 15:41:46 +02:00
Olivier Parcollet
072b45ac1c arrays: Remove dim0, dim1, .shape in various matrix object.
Not in the concept, not needed, just an annoyance.
replaced by free functions :
first_dim(A), second_dim(A), get_shape(A) and so on...
2013-08-27 13:43:58 +02:00
Olivier Parcollet
c8fcb40164 arrays : rm linalg/determinant and inverse (links)
It is clearer to have only one file :
det_and_inverse.hpp
changed the included in tests.
2013-08-27 13:43:57 +02:00
Olivier Parcollet
f2c7d449cc First commit : triqs libs version 1.0 alpha1
for earlier commits, see TRIQS0.x repository.
2013-07-17 19:24:07 +02:00