Compares two VariantKeys by chromosome only. Returns -1 if the first chromosome is smaller than the second, 0 if they are equal and 1 if the first is greater than the second.

Compares two VariantKeys by chromosome only. Returns -1 if the first chromosome is smaller than the second, 0 if they are equal and 1 if the first is greater than the second.

CompareVariantKeyChrom(vka, vkb)

Arguments

vka	The first VariantKey to be compared.
vkb	The second VariantKey to be compared.