Hi With a checkout from today I see octave:1> test eigs ***** testif HAVE_ARPACK d1 = eigs (A, k); assert (abs(d1), abs(d0(end:-1:(end-k+1))), 1e-12); !!!!! test failed eigs: error -8 in znaupdoctave:2> Does this mean I have some dependencies installed wrongly, or is it a bug in Octave? Søren