Reference library

Lists & loops

Iterate, transform, and combine sequences with readable loop patterns.

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Lists & loops easy

Find Local Minima (Valleys) in a Numeric List in Python

This code finds indices of all local minima (valleys) in a numeric list, including edge cases, using a simple loop that compares each element with its neighbors.

local minima valleys list
Python 
def find_local_minima(numbers):
    """Find indices of local minima (valleys) in a numeric list.
    
    A value is a local minimum if it's less than or equal to its neighbors.
    Edge elements are considered minima if they're less than or equal to their single neighbor.
    """
    if not numbers:
        return []…
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