dlarfb - uninitialized reference possible

[lawrence mulholland]

Line 256 of DLARFB.f
LASTV = MAX( K, ILADLR( M, K, V, LDV ) )
should be
lastv = k + ILADLR(m-k,k,v(k+1,1),ldv)

the former can access unititialized elements of V when this has column of zeros.

[admin]

We found that your solution would break if m=n=k, for example, since v(k+1,1) could be out of bounds.
Could you be more explicit on "the former can access unititialized elements of V when this has column of zeros"? do you mean when V is the zero matrix? If so, that's not a problem as long as you have a valid value of k.