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DS-1000 / 814 / How to find relative extrema of a given array? An element is a relative extrema…

Problem

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Problem:
How to find relative extrema of a given array? An element is a relative extrema if it is less or equal to the neighbouring n (e.g. n = 2) elements forwards and backwards. The result should be an array of indices of those elements in original order.
A:
<code>
import numpy as np
from scipy import signal
arr = np.array([-624.59309896, -624.59309896, -624.59309896,
                      -625., -625., -625.,])
n = 2
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Scipy

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Source and history

upstream_id / Original problem ID
814
task_id
33704eea-372a-5c49-87a8-93c4efa344aa
task_key
default--test--814
task_revision_id
1
config / split
default / test

Official source

initial import