errcheck_vreq: Error check inputs for the creator function for the vreq class.
Description
Error check inputs for the creator function for the vreq class.
Usage
errcheck_vreq(com, comnull, vr)
Arguments
com
Should be a positive number, equal to comnull*vr
comnull
Should be a positive number
vr
Should be a positive number
Value
errcheck_vreq returns nothing but throws and error if the inputs do not
meet the requirements of a vreq object