owner, status changed; severity set

Gunter — Mon, 24 Sep 2007 21:23:17 GMT

owner changed from mistevens to Gunter
status assigned → new
severity → Problem

the issue was already solved at 07.11.2006 but the patch was never commited.

status, resolution changed

Gunter — Mon, 24 Sep 2007 21:29:47 GMT

status new → closed
resolution None → fixed

patch commited to SVN. See thread "Serious bug in mapped_vector_of_mapped_vector" of uBLAS mailing list (from sept. 2006!)

On Thursday 07 September 2006 14:04, Gunter Winkler wrote:

On Sunday 23 July 2006 11:13, Matthias Troyer wrote:

There is a serious bug in the mapped_vector_of_mapped_vector spare matrix type. Rows containing only zero elements are not treated correctly in prod(). The following code should give a vector that contains only 1 in the last element. Instead prod() gives a vector containing 1 in each element. In debug mode this bug is found by the

I could reproduce the bug. It is inside the vector_assign logic. The product is correctly computed, but the assignment fails. I will give more details shortly.

I finally found the bug and (hopefully) fixed it. The patch and sample program is attached. Is someone using mapped_vector_of_mapped_vector in a larger program? I'd like to know if the changes have any unexpected side affect.

I changed the behavior of the iterators: Even the outer iterators skip empty rows (or columns).

Boost C++ Libraries: Ticket #688: ublas: bug in mapped_vector_of_mapped_vector

owner, status changed; severity set

status, resolution changed