Gonna need to take a ride in the wayback machine all the back to 2004. I first encountered the need for a similar function when generating a repetitive sine wave. It helped me determine the right # of cycles to put into a repeating buffer so that the correct sinusoid frequency could be generated despite having only discrete output sample rates available.
The whole thread is here. The good stuff is found at the end in this post, where I attached 2 LabVIEW-coded methods for calculating a rational approximation. You'll probably need the context of the rest of the thread to decipher the use of terms and names of parameters though.
-Kevin P
ALERT! LabVIEW's subscription-only policy came to an end (finally!). Unfortunately, pricing favors the captured and committed over new adopters -- so tread carefully.
