When you say 'perform the transfer function' do you mean finding a time-based signal's frequency response? Or are you trying to identify the transfer function itself? If we are talking about identifying the function, there is a CVI function "TransferFunction" from the Advanced Analysis Library that, given the time-based input and output of a system (as arrays) can return the values needed for the transfer function (Hf).
If you're simply interested in finding the frequency response of a time-based signal and displaying it in a graph, I would suggest looking into the FFT function in our Advanced Analysis Library, or one of the other pre-made filters found in the "Library>>Advanced Analysis...>>Signal Processing..." operations category. There are a wide variety of diffe
rent filters, and most of them perform their calculations in-place, overwriting the input arrays given. These arrays can then be plotted via the graph control on your user interface panel. Please see the help pages for the FFT and the graph control in you CVI help browser for more information on this topic.
Elaine R.
Applications Engineer
National Instruments
http://www.ni.com/ask
