quad index

This is a prestep function for *momentfun*

1 | ```
lincombfun(S,mycoef)
``` |

`S` |
S is a list of sums output from the sum function |

`mycoef` |
global coefficients for the linear combination function |

YH Zhou, G Mayhew, Z Sun, X Xu, F Zou, FA Wright, 2013 *Space-time clustering and the permutation moments of quadratic forms*, Stat 2(1), 292-302

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