This function is an internal function which extracts from a vector `x`

,
the center of the vector of length `n`

. It emulates the Matlab(R) function `wkeep`

.
This function is used by the cwt_wst function when the HAAR wavelet is selected.

1 | ```
core(x,n)
``` |

`x` |
A vector from wich the center is extracted. |

`n` |
Numeric. The length of the center of |

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