Hi all, I found two bugs in linalg.qmr and linalg.bicg. Traceback (most recent call last): File "sparse_it.py", line 19, in ? sol2,info2 = linalg.qmr(A,r) File "/usr/lib/python2.3/site-packages/scipy/linalg/iterative.py", line 576, in qmr rmatvec = get_rmatvec(A) File "/usr/lib/python2.3/site-packages/scipy/linalg/iterative.py", line 26, in __init__ raise ValueError, "Object must be an array "\ ValueError: Object must be an array or have a callable rmatvec attribute. Traceback (most recent call last): File "sparse_it.py", line 20, in ? sol3,info3 = linalg.bicg(A,r) File "/usr/lib/python2.3/site-packages/scipy/linalg/iterative.py", line 154, in bicg rmatvec = get_rmatvec(A) File "/usr/lib/python2.3/site-packages/scipy/linalg/iterative.py", line 26, in __init__ raise ValueError, "Object must be an array "\ ValueError: Object must be an array or have a callable rmatvec attribute. Nils