int inedgegroup(string filename, string groupname, int pointnum0, int pointnum1)
int inedgegroup(int input, string groupname, int pointnum0, int pointnum1)
Returns 1 if the edge specified by the point pair is in the group specified by the string. This function returns 0 if the group does not exist or if the edge is not contained in the group.
This can use ad-hoc groups, like p29-30
. It matches the SOP group naming
convention, in particular that an empty string means all edges.
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