In Sage versions 5.6, 5.7, and now in 5.8 too, installing the optional
package cbc-2.7.5 doesn't work.
Some details: I always install sage from source on an intel 64 bit machine
under Ubuntu. sage -i cbc-2.7.5 works fine. Doing sage -b afterwards yields:
Building
Hello !!!
Am I doing something wrong?
It's very hard to do something wrong with only two lines of code. I'll take
a look at that, but I would bet that the problem comes from a newer version
of Cython :-)
Nathann
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Hello !
It's very hard to do something wrong with only two lines of code. I'll
take
a look at that, but I would bet that the problem comes from a newer
version
of Cython :-)
It's fixed there : http://trac.sagemath.org/sage_trac/ticket/14310
Probably a Cython upgrade. Oh, and CBC
Suppose that A is an m by n integer matrix. Its Gram matrix is G = A*A^t.
If A is not full rank, then G has some eigenvalues of 0. If I do
G.LLL_gram() I get a somewhat uniformative error message like:
Value Error: ma matrix from Full MatrixSpace of 10 by 2 dense matrices over
Integer Ring
