I'm trying to debug a function that is returning NaN's somewhat sporatically and for no obvious (to me) reason. I didn't write this function, but have gone through it pretty carefully and can't find anything that looks wrong -- though I'm a fairly new mathcad user. Basically, the function pulls in some part numbers, queries a database for some values that go with those part numbers (ESR, Capacitance and ESL for those interested), does a few simple matrix operations and returns the result. It works fine when the number of parts is low (below 11 seems to work every time) but when my part number matrix is too long I get random NaN's as a result of the matrix operations. Hopefully the attached screenshots will explain better in detail -- they show the function and various outputs with 6, 14 and 44 parts. Does anyone have any ideas about this?
Message was edited by: Jay Kobor Note: The parts are the same and in the same order throughout the screenshots. So the first 6 caps in the 14caps image are the same caps as in the 6caps image, and so on. I just mention this to highlight the eccentricity of the problem, since the parts are consistent but the NaN's are not.