calculate max or min of subset of a matrix

calc.maxmin(r2, L1, L2 = L1, fun = max)

Arguments

r2

matrix, with row/column names which are members of L1, L2

L1

first list of vectors of snps

L2

second list vectors of snps

fun

max or min, but could be another function that returns a scalar. unquoted.

Value

smaller matrix indexed by elements of L1 (rows) and L2 (columns)