Compute the total resistance of n resistors in parallel.

This m-file function can be used in any area where the total electrical resistance of parallel resistors is required.

Example usage:
>> z = Rparallel3(1,1,1)

z = 0.3333

>>

By using 'varargin' Rparallel3 can take a variable number of input arguments (scalars only) allowed. I got the idea for this function from an Instructor for an Introduction course on MATLAB that I attended 3 years ago as a helper/attendee. The code has evolved a bit since my first foray into MATLAB but the function essentially performs the same as the first version I wrote as a learner 3 years ago.