Hi all thanks to everyone that reviewed my code. The good news 1. I happy to say that it has become useful enough for me to use it in some matlab type caluculations. includes transient and dc op 2. The simple pivtoing code I added into the DSP Lu appears to be useable for this application. The bad news 1. If you dont use some strategy in simplifying circuits and use the simulator only, it would take a considerable amount of time to converge. A simple 10x10 non linear matrix will take 13 minutes. In a high-end circuit simulator this would have taken less than a second. What is everybodies expereience in speed difference between C and interpreted haskell? I am hoping to achieve at least 10x an equivalent C code. So if a 10x10 matrix takes 1 second for C I want it to take 10seconds for hugs. regards fernan -- http://www.fernski.com