I want to find a local maxima in a huge dataset with Excel and the way I've been trying is to compare the previous and the next value to make sure they are smaller eg.:

```
=IF(AND(C4>C3,C4>C5),"Local maxima","")
```

But the trouble with this formula is that if the peak stretches across multiple rows it won't catch that as local maxima. And that is despite the fact that it is a local maxima as values begins to fall.

*(If you want to know why it is to find the local maxima in a set of spectrum data)*