Hi all, Another bug is revealed Traceback (most recent call last): File "complex_it.py", line 6, in ? res=dot(A,x)-r File "/usr/lib/python2.3/site-packages/Numeric/dotblas/__init__.py", line 55, in dot if multiarray.array(a).shape == () or multiarray.array(b).shape == (): TypeError: a float is required Nils