Visual C++ :: Create A Program That Perform Same Calculation For Every Oscillation

I am reading from a text file and want to create a program that will perform the same calculation for every oscillation.

The text file I'm reading from is attached to this post. A3.txt

The program that I've written is as follows:

Code:
#include <iostream>
#include <fstream>
using namespace std;
int main() {
ifstream inFile ("AP1.txt");
ofstream results_file ("APDuration.txt");

[Code]...

Where I'm having trouble is in having the inFile.seekg function iterate to the next series of values.

Here is what the data file looks like in a graph:

In a nutshell, my program will read the duration of each action potential from a point called "dVmax" (where the upstroke is at its maximum upward rate of change) to the point of 90% repolarization (on the downstroke where 90% of the total wave amplitude is subtracted from the volts at peak amplitude).

If you would like to test my program on one action potential, here is one action potential : AP1.txt