Performs conditional distance covariance with given bandwidth.

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`x` |
a numeric vector or matrix |

`y` |
a numeric vector or matrix with compatible dimensions to |

`z` |
the variable being conditioned. |

`width` |
a positive value, user-specified |

`index` |
exponent on Euclidean distance, in (0,2] |

Perform the measurement of the conditional independence between x and y given z with given bandwidth.

`cdcov` |
conditional distance covariance with given variable |

`width` |
the bandwidth |

`index` |
exponent on Euclidean distance, in (0,2] |

Canhong Wen, Wenliang Pan, and Xueqin Wang

Canhong Wen, Wenliang Pan, Mian Huang and Xueqin Wang(2014). Conditional distance correlation
sure independence screening for ultrahigh dimensional data. *Submitted to Biostatistics*.

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