getPositions: Get positions of PVCs
Description
Returns the positions of all ventricular premature complexes (VPCs) and
accordingly the coupling intervals that were found in the given vector
when the HRTList was created.
Usage
getPositions(HRTListObj)# S4 method for HRTList
getPositions(HRTListObj)
Value
No return value, possibly throws errors/warnings