[R] pairing data using combn with criteria

[bjmjarrett]

Dear All,

I have a dataframe made up of individual beetles consisting of individual
number, family number, mother's family number, father's family number, and
sex of the beetle.  I would like to pair up the individuals for breeding.  I
would, however, like to avoid breeding beetles of the same sex (obviously),
the same family, and with the same mother's family or father's family, to
avoid inbreeding. 

The pairs of the beetles can be done with the function combn(individual, 2). 
I have been trying to use the FUN argument of combn by reducing the options
for combn for each individual by negating the rows that share the same sex,
family, and parents' families, but I have had no success.

Is there an easy way to package all of this into a function for the combn
FUN argument, or is there an alternative way of doing this?

Many thanks in anticipation,

Ben Jarrett



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