I have a .CSV file (a list) that contains 43142 rows and 2 columns.

When plotting the list's values x vs y:

```
import numpy as np
import matplotlib.pyplot as plt
filename=np.genfromtxt(list.CSV,delimiter=',')
plt.plot(filename[:,0],filename[:,1])
```

I get a graph which has multiple maxima values and looks like this: x vs y values of list.CSV

What i want to do is, given an aproximate interval in the x values in which the peaks are positioned, find the maximum values and the corresponding indices on the list.

*e.g* if there's a maximum **y** value in the interval **x=(2720,2730)** (refer to figure 2), i want to find the exact index in which the value is maximum.