Sylvestre Ledru <sylves...@debian.org> writes: > On 28/11/2012 15:05, Christophe TROESTLER wrote: > >> The routine DGEMV (with TRANS = 'N') is supposed to perform the >> operation >> >> y ← beta * y + alpha * A * x >> >> where the matrix A has dimensions M×N. In particular, if N=0 (and M > >> 0), A * x is the null vector (all elements are given by sums on an >> empty set of indices). Consequently, if N = 0, the operation should >> be >> >> y ← beta * y >> >> and NOT leave y untouched. For your convenience, I have attached a >> program demonstrating the latter (wrong) behavior. > > I am getting: > 1.0000000000000000 > 2.0000000000000000 > What should I get ? > 2 & 2 ?
Christophe is expecting 2 & 4 (Y=[1,2] and beta=2 in his example) -- .''`. Sébastien Villemot : :' : Debian Developer `. `' http://www.dynare.org/sebastien `- GPG Key: 4096R/381A7594
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