optmatch_same_distance function

Checks if two distances are equivalent. x and y can be distances (InfinitySparseMatrix, BlockedInfinitySparseMatrix, or DenseMatrix), or they can be optmatch objects.

To save space, optmatch objects merely store a hash of the distance matrix instead of the original object. Any distance objects are hashed before comparison.

optmatch_same_distance(x, y)

Arguments

• x: A distances (InfinitySparseMatrix, BlockedInfinitySparseMatrix, or DenseMatrix), or optmatch object.
• y: A distances (InfinitySparseMatrix, BlockedInfinitySparseMatrix, or DenseMatrix), or optmatch object.

Returns

Boolean whether the two distance specifications are identical.

Details

Note that the distance is hashed with its call set to NULL. (This avoids issues where, for example, match_on(Z~X, data=d, caliper=NULL) and match_on(Z~X, data=d) produce identical matches but have differing calls.)