Finds troughs in a time series by using a sliding window.

1 | ```
find_local_minima(x, npoints = 3)
``` |

`x` |
The vector of numbers for which to identify peaks |

`npoints` |
The number of points to either side of the local minima. Author: user 'stas g' on stackexchange at https://stats.stackexchange.com/questions/22974/how-to-find-local-peaks-valleys-in-a-series-of-data |

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